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PyFlakes a Lint-like tool for Python, like PyChecker. It is focused on
identifying common errors quickly without executing Python code.
Its primary advantage over PyChecker is that it is fast. You don't have
to sit around for minutes waiting for the checker to run; it runs on most
large projects in only a few seconds.
The two primary categories of defects reported by PyFlakes are:
* Names which are used but not defined or used before they are defined
* Names which are redefined without having been used
These can each take many forms. For example, PyFlakes will tell you when
you have forgotten an import, mistyped a variable name, defined two functions
with the same name, shadowed a variable from another scope, imported a module
twice, or two different modules with the same name, and so on.