Mastering the Art of Programming in Python 3/

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Solution Review: Count with Dictionary

Solution Review: Count with Dictionary

The solution to the 'Count with Dictionary' challenge.

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from collections import defaultdict
from collections import OrderedDict
def count_letters(message):
    d = defaultdict(int)    # Making dictionary with int
    for letter in message:
        d[letter] += 1      # Adding 1 with every repetition
    # Sorting on the basis of values
    return OrderedDict(sorted(d.items(), key = lambda t:t[1]))
print(count_letters('Welcome to Educative'))

Explanation

In the code above, we first import defaultdict and OrderedDict to solve the problem. Now, look at the header of the count_letters function at line 4. It takes message as a parameter containing the string that we want to count the letters of. The only trick here was to know the value of default_factory when ...