'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

has_key was removed in Python 3. From the documentation:

• Removed dict.has_key() – use the in operator instead.

Here's an example:

if start not in graph:
    return None