reindent [-d][-r][-v] [ path ... ]

-d (--dryrun) Dry run. Analyze, but don't make any changes to files. -r (--recurse) Recurse. Search for all .py files in subdirectories too. -B (--no-backup) Don't write .bak backup files. -v (--verbose) Verbose. Print informative msgs; else only names of changed files. -h (--help) Help. Print this usage information and exit.

Change Python (.py) files to use 4-space indents and no hard tab characters. Also trim excess spaces and tabs from ends of lines, and remove empty lines at the end of files. Also ensure the last line ends with a newline.

If no paths are given on the command line, reindent operates as a filter, reading a single source file from standard input and writing the transformed source to standard output. In this case, the -d, -r and -v flags are ignored.

You can pass one or more file and/or directory paths. When a directory path, all .py files within the directory will be examined, and, if the -r option is given, likewise recursively for subdirectories.

If output is not to standard output, reindent overwrites files in place, renaming the originals with a .bak extension. If it finds nothing to change, the file is left alone. If reindent does change a file, the changed file is a fixed-point for future runs (i.e., running reindent on the resulting .py file won't change it again).

The hard part of reindenting is figuring out what to do with comment lines. So long as the input files get a clean bill of health from, reindent should do a good job.

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