Have you seen the error below? Traceback (most recent call last): File “C:/Users/foo/PycharmProjects/pythonProject3/main.py”, line 29, in <module> main() File “C:/Users/foo/PycharmProjects/pythonProject3/main.py”, line 19, in main a[‘foo’] += 5 KeyError: ‘foo’ Of course you have. And you know, that it is because …

Python – DefaultDict Object. Or how to avoid the Key Error. Read more »