Mercurial > hg > config
view python/slice.py @ 741:9681a0bd74d6
add utility for slicing video files
author | Jeff Hammel <k0scist@gmail.com> |
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date | Sun, 28 Jun 2015 11:56:13 -0700 |
parents | de7bf9523e21 |
children |
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#!/usr/bin/env python # -*- coding: utf-8 -*- """ slice a arbitrarily sized list """ # imports import argparse import os import subprocess import sys __all__ = ['slice', 'main', 'Parser'] def slice(container, n_chunks): size = int(len(container)/(n_chunks-1)) retval = [] start = 0 for i in range(n_chunks-1): retval.append(container[start:start+size]) start += size retval.append(container[start:]) return retval class Parser(argparse.ArgumentParser): """CLI option parser""" def __init__(self, **kwargs): kwargs.setdefault('description', __doc__) argparse.ArgumentParser.__init__(self, **kwargs) self.add_argument('N', type=int, help="number of chunks") self.add_argument('-M', '--len', dest='length', type=int, default=29, help="length of list [DEFAULT: %(default)s]") self.options = None def parse_args(self, *args, **kw): options = argparse.ArgumentParser.parse_args(self, *args, **kw) self.validate(options) self.options = options return options def validate(self, options): """validate options""" def main(args=sys.argv[1:]): """CLI""" # parse command line options parser = Parser() options = parser.parse_args(args) # generate list seq = range(options.length) # chunk list output = slice(seq, options.N) # print output for chunk in output: print (",".join([str(i) for i in chunk])) if __name__ == '__main__': main()