Write a function that accepts a dictionary as an argument. If the dictionary contains duplicate values, it should return an empty dictionary. Otherwise, it should return a new dictionary where the values become the keys and the keys become the values.
Source Code
def swap_key_value(d):
L = list(d.values())
for value in L:
if L.count(value) > 1:
return dict()
new_dict = {}
for k, v in d.items():
new_dict[v] = k
return new_dict
d = {'a':10,'b':20,'c':20}
print(d)
n = swap_key_value(d)
print(n)
d = {'a':10,'b':20,'c':30}
print(d)
n = swap_key_value(d)
print(n)Output
{'a': 10, 'b': 20, 'c': 20}
{}
{'a': 10, 'b': 20, 'c': 30}
{10: 'a', 20: 'b', 30: 'c'}