Question

Iterating Over a Dictionary

A dictionary is an iterable object and so a for loop can be used to iterate over the entries in a dictionary. The loop

for k in dict:
    body_code

will iterate over the keys of the dictionary dict setting k in turn to each key of dict.

Consider a dictionary that has strings as keys and integers as values -
e.g.

{'a':24, 'e':30, 't':12, 'n':10}

Write a function big_keys that takes such a dictionary as the first argument and an integer as the second argument and returns the list of keys all of whose values are bigger than the second argument.

You must use a for loop to iterate over the dictionary.

Example:

>>> big_keys({'a':24, 'e':30, 't':12, 'n':10}, 15)
['a', 'e']

Answer 1

def big_keys(dictionary, num):
    result = []
    for k in dictionary:
        if dictionary[k] > num:
            result.append(k)
    return result


print(big_keys({'a': 24, 'e': 30, 't': 12, 'n': 10}, 15))

['a', 'e'l Process finished with exit code o