'dict' object has no attribute 'has_key'

Question

While traversing a graph in Python, a I\'m receiving this error:

\'dict\' object has no attribute \'has_key\'

Here is my code:

Answer 1

In python3, has_key(key) is replaced by __contains__(key)

Tested in python3.7:

a = {'a':1, 'b':2, 'c':3}
print(a.__contains__('a'))