As part of this session, we will introduce you to Regular Expressions
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#Regular Expressions
#. Matches any character
import re
print('This is AA and this is AAA and this is AAAA.My email id is XYZ@gmail.com')
y=re.findall('.','This is AA and this is AAA and this is AAAA.My email id is XYZ@gmail.com')
#l1=list()
#l1=y
print(y)
#print(l1)
Basically in the ablove code findall function is returning all the characters of the string as a list?
Upvote ShareYes, you are correct!
The
re.findall()function with the pattern.matches any character except a newline. Since the pattern.is used, it will match each individual character in the string, and thefindall()function returns a list of all these matches.For the given string, the function returns all characters, including spaces and punctuation, as separate elements in a list.
1 Upvote ShareHey Admin,
I'm getting the following error:
FileNotFoundError: [Errno 2] No such file or directory: 'mbox-short.txt'
I tried cloning the repository into my home folder ,however ,I'm getting the "write error ' while cloning . I've attached the snippet of the same above.
Upvote SharePlease help resolve the issue.
Hi Rajat,
To resolve that,
you can clone the repo in the /tmp directory and then move it to your home directory. You can move to the tmp directory by using:
After that, create a directory with your username to avoid ownership issues, such as:
After that, clone the repo inside the directory as told in the tutorial. After the repo gets cloned, move the webserver directory to your home directory by-
where, source is the path of the directory which you want to move, and destination is the path of the directory where you want to move the source directory.
That may do your work.
Upvote ShareThis comment has been removed.
This comment has been removed.
I don't see the ml folder and data in my home directory. Please help?
Upvote ShareHi,
Can you elaborate on your doubt?
Upvote Share"[0-9]"
what is used for??
Upvote ShareHi,
[0-9] is used to match a single character in the range 0 - 9.
Thanks.
Upvote Sharewhere can i get the python programs which Sandeep is showing in his video of Regular expression .I am currently using Lab and i cant find anywhere the file which he has all the programs he is showing to teach and asking to practice .
Upvote ShareHi,
For your reference: https://github.com/cloudxlab/ml/tree/master/python
Thanks.
Upvote Sharewhere can i get the python programs which Sandeep is showing in his video of Regular expression .I am currently using Lab and i cant find anywhere the file which he has all the programs he is showing to reach .
Upvote ShareHi,
For your reference: https://github.com/cloudxlab/ml/tree/master/python
Thanks.
Upvote ShareI want to find the exact '2aFrZaB' from the above line. What code should I use for it.
Upvote ShareDid the above code work? I will say try and experiment. You will find the working code yourself.
If not, then please let us know.
Upvote ShareHow to solve this error?
Upvote ShareThis comment has been removed.
Please clone this repository in your home folder using the below command. There you will find the above-mentioned file
Upvote ShareEven after clonning it the error is same.
Upvote ShareHi,
After cloning, we also need to give the correct path to be able to use the fiile:
So try the following path:
Thanks.
Upvote ShareAm I missing something?
Upvote ShareWhich Permission I have to give?
Upvote ShareHi,
The ml folder is outside you current folder. So use: '../ml/python/mbox-short.txt'. This should work.
Thanks.
Upvote ShareThis comment has been removed.
Hi,
Please try:
This should work.
Thanks.
Upvote ShareIt worked. But didn't understand this problem.
Upvote ShareHi,
By doing git clone https://www.github.com/cloudxlab/ml ~/ml
, you cloned the repo into a folder called ml, which is outside of your present working directory. Your present working directory and the ml folder are in the same level. But you are inside you present working directory. So by doing ../, we have moved one level up, where the ml is there. Then we have written the following path needed. Feel free to go through the linux course for more understanding. https://cloudxlab.com/assessment/displayslide/12/the-directory-structure?course_id=124&playlist_id=2
Thanks.
Upvote ShareHey admin, could you just notice 1 and 2 and answer the query
# 3 dots
1) re.findall('t...' , 'this is a and that is aa')
# 2 dots
2) re.findall('t..' , 'this is a and that is aa')
shoudn't the output for 1 be ['this', 'that' , 't is']??
Thanks!
Upvote ShareHi,
. means any character. Space is also a character, and hence considered.
Thanks.
Upvote Sharehello admin,
Is there a command in linux by which we can straight away find the path of a file be it in any directory ?
Upvote ShareHi,
Feel free to look at https://superuser.com/a/327764
Thanks.
Upvote Sharehere is my file
Upvote ShareHi,
If try the following path:
~/cloudxlab_jupyter_notebooks/mbox-short.txt
Thanks.
1 Upvote ShareHi,
please tell guide, Why am i not able to open the file.
You have given the url. Please give file path.
Upvote ShareWhats difference between * and + regular expressions?
Upvote ShareHi,
A period followed by an asterisk (. *) matches zero or more instances, while a period followed by a plus (. +) matches one or more instances.
Thanks.
Upvote ShareI am getting an error "No such file or directory" when I execute "fhand = open('/home/rmmk212922/ml/python/mbox-short.txt')".
Also tried "ml/python/mbox-short.txt" but getting the same error. I tried dir command and could not find the ml directory.
Command "!dir ml/python/" gives error - dir: cannot access ml/python/: No such file or directory
I am able to open mbox.txt but not mbox-short.txt
Upvote ShareHi,
Please clone our GitHub repository to get access to that file by using the following command in a web console:
Thanks.
1 Upvote ShareThank you Rajtilak, it is working now..
Upvote ShareI COULD NOT SEE FILE mbox-short.txt.
WHEN I executed the command hand=open('mbox-short.txt') gave me error .
Upvote ShareHi,
Try the following path instead:
Thanks.
Upvote ShareThe file shows stephen.marquard@uct.ac.za and louis@media.berkeley.edu email addresses twice. However the below command returns these names only once.
import re
Upvote Sharehand = open('/home/chits154575/ml/python/mbox-short.txt')
for line in hand:
line = line.rstrip()
if re.search('^From:',line) :
print(line)
Hi,
There is a project related to this in the next topic, I would urge you to try your hands on that.
Thanks.
Upvote ShareWhy I am getting a blank list while compiling the below regular expression
Hi,
I cannot see the complete string, so please ensure the expression you have provided matches the string. If it does not, it will show a blank list like above.
Thanks.
Upvote ShareHi Rohit,
If you are looking at all the words which start from 't' then your pattern should be 't...' here in your pattern it looks it should starts with 't' in the line variable as you use '^'.
For all the word which starts with the 't' and is return the 4 char then below is an example.
Hope this helps you.
Happy learning
1 Upvote ShareThe output is not giving email ID separating with @. can you please help
Hi Rohit,
you can think a couple of things for this and then it will give you the result.
1. lines which started 'From'
2. for email create pattern there should only 1 @ and before that it should be alphanumeric, underscore and a dot. Also, string will not start with the dot.
3. String after the @ any alphanumeric with underscore and dot, same here it should not end with a dot. Also in the general case, only one dot should be present.
You can try your regex here both these below link gives you what your regex is doing and you can put different test cases as well.
https://regex101.com/
https://regexr.com/
Hope this help
Happy coding :)
Warm regards
1 Upvote ShareThis comment has been removed.
Sir,
Why it is considering the 'a' of 'and' in case of the program wrtitten
import re
re.findall("a+", "this is a aa and that is a aaa")
??
Even if it's finding it why it is showing "a" and not "and" ?
Upvote ShareHi,
This is because we are trying to find the character "a" here and anything other character associated with it.
Thanks.
Upvote ShareHi,
what is the exact meaning of non whitespace here ? Is it the character itself?
Upvote ShareHi,
Good question!
whitespace is a pre-initialized string used as string constant. In Python, string. whitespace will give the characters space, tab, linefeed, return, formfeed, and vertical tab.
In Python, isspace() is a built-in method used for string handling. The isspace() methods returns “True” if all characters in the string are whitespace characters, Otherwise, It returns “False”. This function is used to check if the argument contains all whitespace characters such as : ' ' – Space.
Thanks.
Upvote ShareKindly extend my course validity..I had corona that's why couldn't complete the course.
Upvote Shareimport re
hand=open('mbox-short.txt')
for line in hand:
line=line.rstrip()
if re.search('From:',line):
print(line)
output
pl help
Upvote ShareHi,
First, check if the file exists in that location. If it does not, please clone our GitHub repository from the link give below the lecture slides.
Thanks.
Upvote Sharepl guide how to clone
thanks
Upvote ShareHi,
Please use the following command in your Jupyter notebook:
Thanks.
Upvote ShareIt is still giving the same message after performing the clone command.
Upvote ShareHi Sanny,
First, check if the file exists after the cloning. If it does, provide the complete path to the file.
Thanks.
Upvote ShareFile does exist after cloning but it is still giving the same error.
Upvote Sharepath: root folder / ml / python
Upvote ShareHi,
Please share a screenshot of the location of the file, and your code.
Thanks.
Upvote Sharefirst
second
Upvote ShareHi,
There is no screenshot under second. Is there any issue?
Thanks.
Upvote ShareOne question - why we applied rstrip in the code below:
for line in hand:
line = line.rstrip()
if line.startswith('From:'):
print(line)
Please advise. Thanks
Upvote ShareHi,
The rstrip() method removes any trailing characters (characters at the end a string), space is the default trailing character to remove.
Thanks.
Upvote Share# print integer or decimals
Upvote Shareimport re
x = 'this is 34a5 a aa 35.0 and that is a12 aaa'
re.findall('[0-9]+\\.?[0-9]*',x)
Hi,
Upvote ShareIs it possible to get the jupyter notebook which is being explained in the video?
Hi,
Yes, absolutely! You can get access to these notebooks from our GitHub repository at the below link:
https://github.com/cloudxlab/ml/tree/master/python
Thanks.
1 Upvote ShareSome problem uploading the screenshot. I am pasting the code and the o/p below:
*************************************************************************************************************
import re
# to capture end of line ($)
re.findall("...a$", "this is a aa and aaa test")
Out [5] : [ ]
Upvote ShareIt would suggest you to look again at what $ does in regex in the slides. Let me know if you still have a doubt.
Upvote ShareGot it Sandeep. Thanks!
Upvote ShareAtaching the screenshot again:
Upvote ShareHello,
Could you please let me know why am I not getting any value in the o/p as shown in the screenshot usingt the '...$a'?
Upvote ShareWhat is the difference between 'fhandle' and 'hand' command used for to open and read file? When and in what use case do we use these alternatively? Thanks!
Upvote ShareHi,
These are not commands but variable names. We usually use open() function to open the file.
Thanks.
Upvote ShareGot it.....thanks!
Upvote ShareHello,
I am unable to open the file. I have tried to open the files using 2 approaches as below but it dis not work. Could you please help locate the file?
hand = open( '../ml/python/mbox-shor.txt')
hand = open( '../mbox-shor.txt')
Hi,
You need to clone our GitHub repository first to get access to this file. Please use the following command in a console for the same:
git clone https://github.com/cloudxlab/ml
Once done, you will find the file under the following path:
../ml/python/
Please check where you have cloned the file, and then use the path accordingly.
Thanks.
Upvote ShareDone it...Thanks!
Upvote Sharehi,
if i try with regular expression 'a+' i am getting o/p as expeceted. But if try using "t+" why extra t is coming in the o/p. Please find the below o/p s For reference.
import re
re.findall('a+','this is a aa and that is a aaa')
import re
Upvote Sharere.findall('t+','this is a aa and that is a aaa')
Hi Nagamani,
Because there are two 't' in 'that' and there are different characters("ah") in between, therefore both 't' are separated in output.
Upvote Shareunderstood. Thanks
Upvote ShareHi, i didn't understood the operation of ' .* ' operator .could you explain how it is working? moreover i have not understnad why a null charechter is generated at the end of the list?
Upvote ShareHi,
. means any character, * means zero or more occurences. Could you tell me more about the null character, maybe share a screenshot or give an example.
Thanks.
Upvote Sharein the below one , the last element of the list is null, why it is being generated ?
Hi,
This is because of the newline character present in the end.
Thanks.
Upvote ShareBut in the above example there is no newline charechter at the end of the string?
Upvote Share* means 0 or more occurrence and . matches empty string also. So, your regex matches empty string at the end. If you want to match the string without empty string you can try ".+"
1 Upvote ShareHello,
I am getting the below erroe as file - 'mbox-short.txt' is not available, can you assist?
--------------------------------------------------------------------------- FileNotFoundError Traceback (most recent call last) <ipython-input-13-70ab0e4db102> in <module> 1 import re ----> 2 hand = open('mbox-short.txt') 3 for line in hand: 4 line=line.rstrip() 5 if re.search('From:',line): FileNotFoundError: [Errno 2] No such file or directory: 'mbox-short.txt'Upvote ShareHi,
Please provide the relative path to the file.
Thanks.
Upvote ShareThis comment has been removed.
Hi, i to have same issue.I have mbox-short.txt file in ml/python but while i am running the code i am getting that no file is found. could you explain in brief how to specify the path to the file. Thanks in advance.
Upvote ShareHi Bindu,
The default notebooks are in "cloudxlab_jupyter_notebooks) so you have to go a direcotory up which is '../ml/python/mbox-shor.txt'.
Upvote Shareok, thank you
Upvote Sharehi,
i tried with the same path you mentioned. i am still facing problem
f=open( '../ml/python/sample2.txt')
Upvote ShareHi Nagamani,
Path might be different for you, please check the path using file browser present in jupyter.
Upvote Sharehow to use file browser.
Upvote ShareHi,
I just replied to your mail, please check. Also you might want to go over the lectures on relative file paths before trying this.
Thanks.
Upvote ShareHi Raj,
Can U pls expln slide number 31, which is not explained in the video...
similar code as shown in the slide...
## Spam Confidence
import re
Upvote Sharehand = open('mbox-short.txt')
numlist = list()
for line in hand:
line = line.rstrip()
stuff = re.findall('^X-DSPAM-Confidence: ([0-9.]+)', line)
if len(stuff) != 1 : continue
print(line)
num = float(stuff[0])
numlist.append(num)
print('Maximum:', max(numlist))
print('AVG:', sum(numlist)/len(numlist))
Hi,
Here we are opening a file and counting all lines in that file which starts with X-DSPAM-Confidence.
Thanks.
1 Upvote Share00:33:50
why not 'a a' is counted/ shown multiple times, pls explain?
00:38:20 to 00:38:40
'a +' & 'a\s' both are not the same, 1st results all number of spaces present after 'a', it can be up to n numbers if such thing present but on the other hand second results 'a' but only single space,
isn't it , pls explain?
Upvote ShareHi Kranti,
At 00:30:50, the 'a' after 'is ' is already counted and the findall function will start scanning the next character so that 'a' won't be count this time.
Please execute the following code to get a better idea:
import re
re.findall(".\s.","this is a aa and that is aa aaa")
1 Upvote Shareand yes the difference between 'a +' & 'a\s' is that the 'a +' will print all the white spaces after 'a' and 'a\s' will only print one white space which is after 'a'.
Just tried the code again it skipped the one 'a a'
Upvote ShareThis comment has been removed.
a
Hi Kranti,
No, it left nothing, single 'a' is already counted in 's a' with 's' so now the algorithm will start searching from next position which is whitespace and 're.findall' will ignore this whitespace because the character before this whitespace is already counted, and if it is counted again, there will be a redundancy search result.
1 Upvote Shareit means as per u, there are only 7 whitespaces present in the string, m I rt?
Upvote ShareHi Kranti,
No i didn't mean that, to print only white spaces we have to use '\s' only then you would be able to see whitespaces only.
Here we are printing ".\s." which means any character followed by whitespace followed by any character.
Please try executing different variations such as ".\s" , "\s." , "\s" , ".\s.*" .
1 Upvote Sharethen the purpose of mine to count the whitespaces is failed, and I got the wrong answer,,, I did multiple combination in my notebook, I've this confusion which is not clear yet so I'm dicussing it here. That is , if I want to count the whitespaces in the line I'll get wrong answer if above situation arises.
Upvote ShareVery Good point
If you do this:
You will get:
Upvote ShareOkay, so this is how it is calculating,,, don't you feel it is an error? Or is it universal like that only, if yes then how can I calculate this missed space?
Upvote ShareThis comment has been removed.
yeah, this is okay. but in my original string the code is failed... so what's the remedy for counting all the spaces in the original string, any help?
Upvote ShareI think this will solve the purpose.
Upvote ShareSorry Sachin,,, this code means different
Upvote Sharepic
Hi kranti,
I think the picture shows all the whitespaces. Let me know if i am missing something.
Upvote Sharei think , u r missing a lot , pls call me so that we can discuss
Upvote ShareKranti,
If you are trying to count the number of spaces, you can use the following approach:
1 Upvote ShareThis comment has been removed.
Yeah, Gotcha. Thanks. the result is 8 now, it's okay but in my string, it was 7.
I'm still concerned because whether in our practical cases do we required to count spaces or not, if yes then I've to check my code again that why not it is valid for universal strings, why do we have to change the string to get the desired result or this is the only option to get the desired result or we can do something to get the desired result?
Upvote ShareHi
It depends on what problem you are working on. Yes, at times we do require to count spaces.
Thanks.
Upvote ShareOkay, great, so when I'm trying to count the spaces in my string then the code is counting only 7 instead of 8 so here, is this the limitation of the code?
Upvote ShareHi,
Can you share a screenshot of your code which is counting space?
Thanks.
Upvote Shareit's already in the long trails of comments : -), well here u go .. the last one , below encircled...
Hi,
Here you are not counting spaces but identifying them. There are other better methods to counting spaces, and you can use one of them. For example, you can run a for-loop till the end of the line and count " " characters.
Thanks.
1 Upvote Share00:27:58 to 00:28:48
in python, we're putting a single slash to escape the meaning of special character so why 2 slashes here, pls explain?
Upvote ShareHi,
\\ counts the slash. The first slash is to escape the meaning of special character, the second slash is the special character.
Thanks.
Upvote Shareplease have look of result,, I didn't find any difference,,,,
Upvote Sharepic
Raj, any suggestions?
Upvote ShareHi,
Regular expressions use the backslash character ('\') to indicate special forms or to allow special characters to be used without invoking their special meaning. This collides with Python’s usage of the same character for the same purpose in string literals; for example, to match a literal backslash, one might have to write '\\\\' as the pattern string, because the regular expression must be \\, and each backslash must be expressed as \\ inside a regular Python string literal.
The solution is to use Python’s raw string notation for regular expression patterns; backslashes are not handled in any special way in a string literal prefixed with 'r'. So r"\n" is a two-character string containing '\' and 'n', while "\n" is a one-character string containing a newline. Usually patterns will be expressed in Python code using this raw string notation.
You can find more from the below link:
https://docs.python.org/3.4/library/re.html
Thanks.
Upvote ShareThis comment has been removed.
00:26:57 to 00:27:22
why the code is returning empty line as well as the entire line, pls explain?
Upvote ShareHi,
Every line comprises of that line along with a newline character. This is returning both of them since they are treated as separate lines.
Thanks.
Upvote ShareSorry , didn't get the logic behind it ,, if code has given the entire line the what is the requirement of blank/empty line and I as a coder don't want that which is trash for me,,, can you pls suggest some code to get only line , and a different code to get the empty line separately, don't want together?
Upvote ShareHi,
This is feature of Python. Also, it is not a blank/empty line. It is a newline character which helps print more lines in new separate lines. Without it everything would get printed in a single paragraph.
If you want it without that, simply tell your code to ignore the newline character.
Thanks.
1 Upvote ShareOkay, I'll try to find that code that tells my code to ignore the newline character, and then I'll try again. Thanks
Upvote ShareHi
I am still facing the problem on reading the txt file created at my files
FileNotFoundError Traceback (most recent call last) <ipython-input-5-82c8dff31b9f> in <module> 1 import re ----> 2 hand = open('python.txt') 3 for line in hand: 4 line = line.rstrip() 5 if line.find('From:') >= 0: FileNotFoundError: [Errno 2] No such file or directory: 'python.txt'please gaide here
Upvote ShareHi,
Did you clone our GitHub repository?
Thanks.
Upvote Sharehi
No ,can you let me know how to do it ? if you send instructions i will do it
here
Upvote ShareHi,
Use the below command in your Jupyter notebook:
!git clone https://github.com/cloudxlab/ml
Thanks.
Upvote ShareHi,
Aren't '*' and '?' doing the same thing?
Thanks.
Upvote ShareHi,
* refers to multiple characters, ? refers toa single character.
Thanks.
Upvote ShareWhy I am not getting ['s i', 's a', 'a a', 'a a', 'd t', 't i', 's a', 'a a'] for the above string search operation?
Upvote ShareHi Ritu,
The output you're expecting is possible only if the characters repeat which is not the case. See the second, third and fourth character in your expected output - 's a', 'a a', 'a a'. It will only happen if the 'a' in-between is and aa in the string is detected twice. The same case for the 'a' between is and aaa in the last.
Hope this clears your doubt.
Thanks
Upvote ShareHi, please clone the Github repository for my access, as i could not access the files such as mbox-short.txt
Upvote ShareThis comment has been removed.
Hi,
Please use the following command in your Jupyter notebook and not the console to clone the repository:
!git clone https://github.com/cloudxlab/ml
Thanks.
Upvote ShareHi
why i am getting 't i' in the output. if the whole sentence is having only two words with 't' ?
Upvote ShareHi,
Regular expression that you are using is not checking words by letter. So here it is considering "...that is...".
Thanks.
Upvote ShareIn re.findall('.\s.','this is a aa and that is a aaa'). Why didn't it return (a aaa)??
Upvote ShareHi,
This is because 'is a' already considers the letter 'a', so when it comes to 'aaa' it does not satisfies the regex.
Thanks.
Upvote ShareHi Team,
I am not able to find the git hub location and not able to pull the slides. please support.
regards.
Upvote ShareHi,
Below is the link to our repository:
https://github.com/cloudxlab/ml/tree/master/python
Thanks.
Upvote ShareHello,
How do I get the mbox-short.txt file? I do not see it in my folder
Upvote ShareHi,
These files are located at our GitHub repository, you need to clone them using the following command in your web console:
git clone https://github.com/cloudxlab/ml
Thanks.
Upvote ShareThis comment has been removed.
I have enrolled in Course on Machine Learning Specialization. But, in my server tab, I can see only one folder i.e., cloudxlab_jupyter_notebooks. I am not able to find the other folders as well as files (e.g. mbox-short.txt, puthon_sample_file) as shown in the video . Kindly look into the matter.
My Lab username is ritujainmca8920.
Upvote ShareHi,
Those files and folders are inside that folder. You can check using the ls command in web console.
Let me know if you still face any challenges.
Thanks.
Upvote ShareThis comment has been removed.
Dear Sir,
I have checked the folder cloudxlab_jupyter_notebooks. I have checked using ls command in web console also.
For your reference, I am pasting the screenshots. Kindly help me.
Hi,
The files that you are looking for are available in our Github repository, I have cloned the same for you. You will find them in the cloudxlab_jupyter_notebooks folder/ml/python folder. Please check.
Thanks.
Upvote ShareIn slide 8 and 9, why use re.search() intead of line.startswith() ?
Upvote ShareHi,
This is done so that we can use a regular expression in the search.
Thanks.
Upvote ShareDo the expressions only return the value in the parenthesis()
Upvote ShareHi,
It depends on the expression.
Thanks.
Upvote Share'@([^ ]*)' I didnt understand this expression
Upvote ShareHi Sagan,
'@' matches @, you will use this generally during extracting emails.
'(',')' - marks the beginning and end of the string extraction respectively.
'[^ ]' - Matches everything except space
* - Repeats a character zero or more times
So in total the expression @([^ ]*) means - start extracting after the @ character and extract everything except space that is it will extract all characters until it encounters a space.
Hope this clears your doubt.
Thanks
Upvote ShareI could not able to log in the Lab. After every attempt in every possible way, it is saying invalid username and password. Please help as early as possible. I am wasting my lab hours as well as my time
Upvote ShareHi,
I already replied to your mail, please check.
Thanks.
Upvote Sharenot able to sign in jupyter notebook.
Upvote ShareHi,
Your Jupyter notebook is working fine. Please type in the password instead of copy-pasting it.
Thanks.
Upvote ShareHi Harmeet,
It was nice talking to you. Thank you for all your feedback. As discussed, if you have any issues with the topic of the course, you can reach out to us either by commenting here, or using the email id or at the discussion forum listed below:
https://discuss.cloudxlab.com/
reachus@cloudxlab.com
Thanks and happy learning!
-- Rajtilak Bhattacharjee
Upvote ShareThe professor is struggling to make understand the concepts....didnt get it after the whole lecture....really disaapointed.
Upvote ShareHi,
If you can point out which part of the lecture you were unable to understand, we can clarify the same for you.
Thanks.
-- Rajtilak Bhattacharjee
Upvote Sharedidn't get any single concept concretely....i surfed over youtube and got better explanations.
Upvote ShareHi,
Would request you to share your contact details by mailing us so that we can understand your issues better.
Thanks.
-- Rajtilak Bhattacharjee
Upvote ShareMy jupyter is not working.Its shows and message that:
Upvote Sharejupyter.f.cloudxlab.com took too long to respond.
And I am getting that frequently.
Please help
Hi Sagan,
Upvote ShareSorry for inconvenience, we were upgrading the machine and there was a downtime for few minutes.
It should be working fine now.
I did not understand the * expression
Upvote ShareHi,
You can find explanation for all the regex operators in the below link:
https://docs.python.org/3/l...
Thanks.
-- Rajtilak Bhattacharjee
Upvote Sharecould find file "mbox-short.txt" also I couldnt download slides and your help file for code copying
Upvote ShareHi,
The file "mbox-short.txt" is present in /cxldata/datasets/project/
For slides, you can click on the pop-up button appearing on the top-right of the slide content.
I hope this helps. For any further queries feel free to contact us.
Thanks.
-- Mayank Sharma
Upvote ShareI am not getting mbox-short.txt in file list, how to find it?
Upvote ShareHi Shipra,
It is present in /cxldata/datasets/project/
-- Sachin Giri
Upvote Shareprint(re.findall('@([^ ]*)',line)) how this Regular expression work?
Upvote ShareRachana,
I suggest you try this command in jupyter for different values of line. Or move continue the conversation on discuss.cloudxlab.com.
Praveen
-- Praveen Pavithran
Upvote ShareHello,
I'm running this code but no output is comming. Please help me.
Hi,
Would request you to let us know which assessment you are trying to attempt, also you need to mention the path of the file.
Thanks.
-- Rajtilak Bhattacharjee
Upvote ShareHello,
This is Regular Expressions session. The path of the file is given below
https://jupyter.f.cloudxlab...
Upvote ShareI have uploaded this file ('mbox-short.txt') in my Jupyter notebook then I'm running this code but no result is found.
Hi,
Can you try this path while opening the file:
'../cloudxlab_jupyter_notebooks/ml/python/mbox-short.txt'
Thanks.
-- Rajtilak Bhattacharjee
Upvote ShareHello Sir,
I'm trying this but same problem occurred.
'../cloudxlab_jupyter_notebooks/ml/python/mbox-short.txt'
Hi Souvik,
From your previous screenshot I can see that the file is on the home folder. Could you please set the correct path to the using the pwd command.
Thanks.
-- Rajtilak Bhattacharjee
Upvote Sharesir i am not able to run code on jupyter notepad
Upvote Sharewhat acn i do to run it?
Hi,
I am so sorry to hear that. Could you please tell us whether you are getting any errors, or are you not able to open a Jupyter notebook? Do share a screenshot if possible.
Thanks.
-- Rajtilak Bhattacharjee
Upvote Share--------------------------------
even file is present in files-------------------------------------------
FileNotFoundError Traceback (most recent call last)
<ipython-input-20-6b7c8beec896> in <module>
----> 1 hand = open('mbox-short.txt')
FileNotFoundError: [Errno 2] No such file or directory: 'mbox-short.txt'
Upvote ShareHi,
Could you please share a screenshot of your code and the error that you are getting.
Thanks.
-- Rajtilak Bhattacharjee
Upvote ShareNot able to see python getting started file in github.
Upvote ShareHi,
That would be the Python - Part I notebook in out GitHub repository.
Thanks.
-- Rajtilak Bhattacharjee
Upvote ShareHello sir,
There is one extra "t" is coming and in above example also just few sec back of this one one extra "t" was coming why it's so.
Can u please help me out in this.
Thanks
Hi,
Can you tell me which findall code you are talking about in this example.
Thanks.
-- Rajtilak Bhattacharjee
Upvote ShareIn output 30 of the image shared sir.
Upvote ShareHi,
In output 30 there are three codes, could you please tell me which code you are referring to?
Thanks.
-- Rajtilak Bhattacharjee
Upvote ShareHi,
The last t is for the third findall. The expression here is t. which signifies any character after t except a linebreak.
Thanks.
-- Rajtilak Bhattacharjee
Upvote Shareimport re
hand=open('radha.txt')
Upvote Sharefor line in hand:
line=line.rstrip()
if re.search('New',line):
print(line)
when i am running this expression then i am getting all the line in which New is there but not only line starting with New
can you tell me why?
Hello Disqus,
Thanks for contacting CloudxLab!
This automatic reply is just to let you know that we received your message and we’ll get back to you with a response as quickly as possible. During business hours (9am-5pm IST, Monday-Friday) we do our best to reply within a few hours. Evenings and weekends may take us a little bit longer.
If you have a general question about using CloudxLab, you’re welcome to browse our below Knowledge Base for walkthroughs of all of our features and answers to frequently asked questions.
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Cheers,
Upvote ShareThe CloudxLab Team
Hi Mohini,
Could you please tell me that this is a part of which assignment?
Thanks.
-- Rajtilak Bhattacharjee
Upvote Sharesir,this is the part of regular expression
Upvote ShareHello Disqus,
Thanks for contacting CloudxLab!
This automatic reply is just to let you know that we received your message and we’ll get back to you with a response as quickly as possible. During business hours (9am-5pm IST, Monday-Friday) we do our best to reply within a few hours. Evenings and weekends may take us a little bit longer.
If you have a general question about using CloudxLab, you’re welcome to browse our below Knowledge Base for walkthroughs of all of our features and answers to frequently asked questions.
- Tech FAQ <https: cloudxlab.com="" faq="" support="">
- General FAQ <https: cloudxlab.com="" faq=""/>
If you have any additional information that you think will help us to assist you, please feel free to reply to this email. We look forward to chatting soon!
Cheers,
Upvote ShareThe CloudxLab Team
Hi, Mohini.
If you want to find the line starts with New, then you have use the startswith() method present in Python.
This is the syntax.
str.startswith(prefix[, start[, end]])
re.search() will give the matched object if it find anywhere in the string irrespective to the function.
All the best!
-- Satyajit Das
Upvote Sharehello sir,
how to access the files which you uploadeed on github ???
Upvote Shareat 30:30 in the video , Just a suggestion:
this can be used
import re
re.findall("^[a-z]+", "this is a aa and that is a aaa")
instead of
re.findall("^t.....", "this is a aa and that is a aaa")
to find the first word in the line :)
Upvote ShareHi , I am getting error while opening the new python3 notebook'
Upvote Share"Unexpected error while saving file: Untitled8.ipynb disk I/O error'
Hi ritesh
Upvote ShareAre you still facing error
if yes, Can you please post screenshot?
The Sessions looks like pretty old,around 2 years older they,can you please put latest videos and notebooks into Github.
Upvote ShareHi, is it possible to send the slides of python programming course.
Upvote Shareis it possible to download the slide?
Upvote ShareHi, Anuj.
As of now the Python slides are not available for download, we are working on this.
But you can always download the .ipynb file from our GITHUB repository here :- https://github.com/cloudxla...
All the best!
Upvote ShareThere is no mbox-short.txt file present in files section.
Upvote Sharefrom where i will get this file?
Hi, I am also facing the same problem.
Upvote SharePlease could you let me know where to find this file?
The file is in the github repository. you can clone the entire repository or you can download the zip file.
Upvote Share1 . To download the zip file, go to linux console and enter the command
wget https://github.com/cloudxla...
2. Unzip the file with the command unzip master.zip
3. you can find mbox-short.txt inside python folder.
Thank You !!
Upvote ShareI saved a file in my root directory in jupyter but i can not acces it. How do I access it to perforn RE OPERATIONS ON IT
Upvote ShareYour jupyter files are stored under /cloudxlab_jupyter_notebooks . You can navigate to the location from the files tab - as shown in the image below. There would be some .ipynb files saved under that directory. Please check if your files are present in that location .
re.findall('[0-9]+.[0.9]+', "i am 19.5 and u r 56.8 kg in weight")
Upvote Shareoutput is:
Out[59]:
['19.', '56.']
expected is: ['19.5', '56.8']
Try this
Upvote Sharere.findall('[0-9]+.[0-9]', "i am 19.5 and u r 56.8 kg in weight")That should give you the expected results that you mentioned.