Foundations of Python

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Tuples and Dictionaries

There is a function with the name items associated with dictionaries that returns a list of tuples, where each tuple is a key-value pair:

d = { "one" : 1, "two" : 2, "three" : 3}
k = d.items()
print(k)

It prints dict_items([('one', 1), ('two', 2), ('three', 3)]). We can cast to list using list,

l = list(k)
print(l)

It prints a list of tuples [('one', 1), ('two', 2), ('three', 3)].

Since it is a dictionary, the items are in no particular order.

However, since the list of tuples is a list, and tuples are comparable, we can now sort the list of tuples. Converting a dictionary to a list of tuples is a way for us to output the contents of a dictionary sorted by key.

We can print the content of the dictionary with below code

for key, value in list(k):
    print(key, value)

It prints,

one 1
two 2
three 3
INSTRUCTIONS
  • Define a function with the name dict_tuple_func that takes a list of integers as an argument.
  • It should create a dictionary with the key as the integer and the value as the number of times it is present in the list.
  • It should return a tuple in which the first element is the dictionary (you created above step) and the second element is the sum of all unique integers in the list

Sample Input -

dict_tuple_func([1, 2, 3, 1, 2, 3])

Sample Output -

({1: 2, 2: 2, 3: 2}, 6)

Please note output is the tuple in which first element is the dictionary and the second element is the sum of all the unique integers in the list.

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