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See module py_compile for details of the actual byte-compilation.
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dir: the directory to byte-compile
maxlevels: maximum recursion level (default 10)
ddir: the directory that will be prepended to the path to the
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force: if True, force compilation, even if timestamps are up-to-date
quiet: if True, be quiet during compilation
legacy: if True, produce legacy pyc paths instead of PEP 3147 paths
optimize: optimization level or -1 for level of the interpreter
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Arguments (all optional):
skip_curdir: if true, skip current directory (default True)
maxlevels: max recursion level (default 0)
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legacy: as for compile_dir() (default False)
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