# pyrefact Automatic python refactoring, with the goal of simplifying complicated code, deleting dead code, and to some extent improve performance.
It is strongly recommended that you version control or otherwise backup any code you run pyrefact on.
## Features
### Readability
Invert if/else to put the smaller block first.
De-indent code with early continue and return statements.
Replace loops that only fill up lists or sets with comprehensions.
Rename variables, functions and classes with conventions.
Move code into primitive functions.
### Performance
Replace sum comprehensions and for loops with constant expressions. The symbolic algebra tool [Sympy](https://github.com/sympy/sympy) is used under the hood.
Replace hardcoded inlined collections and comprehensions with set or generator equivalents in places where that would improve performance.
Replace sorted()[:n] with heapq.nsmallest, replace sorted()[0] with min
Replace matrix operation comprehensions with equivalent np.matmul() and np.dot() calls, for code that already depends on numpy.
Use is instead of == for comparisons to None, True and False.
### Removing dead and useless code
Delete unused functions, classes and variables.
Remove most pointless simple statements.
Remove branches of code that obviously do nothing useful.
Remove unreachable code.
Rename unused variables to _
Delete variables named _, unless where that would cause a syntax error.
Remove redundant chained calls involving sorted(), set(), tuple(), reversed(), iter() and list().
Remove duplicate function definitions.
Remove redundant elif and else.
Remove unused self and cls function arguments, and add @staticmethod or @classmethod.
Move functions decorated with @staticmethod outside of their class namespaces.
### Imports
Delete unused imports
Move safe imports to toplevel
Add missing imports by guessing what you probably wanted. * For example, if Sequence is used but never defined, it will insert from typing import Sequence at the top of the file.
### Cleanup
Run black and isort with –line-length=100. (Will be removed in a future release)
## Usage
The –preserve flag lets you define places where code is used. When this is set, pyrefact will try to keep these usages intact. The –safe flag will entirely prevent pyrefact from renaming or removing code. The –from-stdin flag will format code recieved from stdin, and output the result to stdout.
`bash pip install pyrefact python -m pyrefact /path/to/filename.py --preserve /path/to/module/where/filename/is/used python -m pyrefact /path/to/filename.py --safe cat /path/to/filename.py | pyrefact --from-stdin `
## Prerequisites
### CPython
Pyrefact requires python>=3.8, and is tested on CPython 3.8, 3.9, 3.10 and 3.11. Pyrefact works best on python>=3.9.
### Pypy
Pyrefact is supported and tested on Pypy3.9. Pypy3.8 is not supported. Pyrefact is slightly faster on Pypy3.9 than on CPython3.9, but only for large repos as the JIT compile overhead is otherwise too large to make up.
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