Question

In python

def reverse_lookup(input_dict, test_value):
# Complete this function to find all the keys in a dictionary that map to the input value.
# input1: input_dict (dict)
# input2: test_value
# output: list of keys

# YOUR CODE HERE

It has to pass these tests

input_dict = {
'January': 31,
'February': 28,
'March': 31,
'April': 30,
'May': 31,
'June': 30,
'July': 31,
'August': 31,
'September': 30,
'October': 31,
'November': 30,
'December': 31,
}

assert reverse_lookup(input_dict, 31) == ['January', 'March', 'May', 'July', 'August', 'October', 'December']

Answer 1

def reverse_lookup(input_dict, test_value):
    # Complete this function to find all the keys in a dictionary that map to the input value.
    # input1: input_dict (dict)
    # input2: test_value
    # output: list of keys

    # YOUR CODE HERE
    result = []
    for x in input_dict:
        if input_dict[x]==test_value:
            result.append(x)
    return result


input_dict = {
'January': 31,
'February': 28,
'March': 31,
'April': 30,
'May': 31,
'June': 30,
'July': 31,
'August': 31,
'September': 30,
'October': 31,
'November': 30,
'December': 31,
}

assert reverse_lookup(input_dict, 31) == ['January', 'March', 'May', 'July', 'August', 'October', 'December']