E0307
Safety
Critical
__str__ does not return str
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__str__ does not return str
__hash__ does not return an int
Using variable before assignment
Catching an exception which doesn't inherit from Exception.
Detect members or attributes that do not exists
Assigning result of a function call with no return
No value for argument in function call
Assigning result of a function call that returns nothing but None.
Unsupported assignment operation
Unsupported delete operation
Operation is raising exception