Correctness

• Accessing a protected member from outside the class
• Assigning a lambda expression to a variable
• Assigning to built-in function
• Bad except clauses order
• Bad first argument given to super()
• else clause on loop without a break statement
• __exit__ must accept 3 arguments: type, value, traceback
• Explicit return in __init__
• __future__ import is not the first non-docstring statement
• Implementing Java-style getters and setters
• Indentation contains mixed spaces and tabs
• Indentation contains tabs
• Method could be a function
• Method has no argument
• Missing argument to super()
• Using a mutable default value as an argument
• No exception type(s) specified
• Not using defaultdict()
• Not using else where appropriate in a loop
• Not using explicit unpacking
• Not using get() to return a default value from a dict
• Not using setdefault() to initialize a dictionary