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annotate python/count.py @ 807:26786fae0703

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this relies on a requirement that is not part of my (2.7.12) stdlib; i almost deleted it. instead, i will keep for fun and note the requirement for further research
author Jeff Hammel <k0scist@gmail.com>
date Fri, 28 Oct 2016 17:09:04 -0700
parents 8275fa887f2b
children
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1 #!/usr/bin/env python
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2 # -*- coding: utf-8 -*-
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3
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4 """
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5 counting and duplication
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6 """
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7
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8 # imports
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9 import argparse
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10 import sys
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11 from collections import OrderedDict
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12
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13 # module globals
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14 __all__ = ['main', 'CountParser']
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15
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16
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17 def count(*items):
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18 """count the occurance of each (hashable) item"""
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19 counts = OrderedDict()
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20 for item in items:
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21 counts[item] = counts.get(item, 0) + 1
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22 return counts
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23
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24 def duplicates(*items):
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25 """returns set of duplicate items"""
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26 return set([key for key, value in count(*items).items()
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27 if value > 1])
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28
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29 class CountParser(argparse.ArgumentParser):
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30 """CLI option parser"""
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31
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32 def __init__(self, **kwargs):
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33 kwargs.setdefault('formatter_class', argparse.RawTextHelpFormatter)
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34 kwargs.setdefault('description', __doc__)
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35 argparse.ArgumentParser.__init__(self, **kwargs)
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36 self.add_argument('input', nargs='?',
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37 type=argparse.FileType('r'), default=sys.stdin,
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38 help="file to read items from, or stdin by default")
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39 self.add_argument('--duplicates', dest='duplicates',
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40 action='store_true', default=False,
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41 help="print (sorted) duplicates, not counts")
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42 self.options = None
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43
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44 def parse_args(self, *args, **kw):
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45 options = argparse.ArgumentParser.parse_args(self, *args, **kw)
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46 self.validate(options)
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47 self.options = options
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48 return options
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49
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50 def validate(self, options):
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51 """validate options"""
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52
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53 def main(args=sys.argv[1:]):
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54 """CLI"""
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55
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56 # parse command line options
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57 parser = CountParser()
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58 options = parser.parse_args(args)
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59
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60 # read a thing
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61 try:
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62 items = options.input.read().strip().split()
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63 except KeyboardInterrupt:
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64 # probably trying to read stdin interactively
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65 # revert! revert! revert!
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66 return
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67
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68 if options.duplicates:
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69 print ('\n'.join(sorted(duplicates(*items))))
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70 else:
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71 # get the counts
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72 for key, value in count(*items).items():
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73 print ('{}:{}'.format(key, value))
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74
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75 if __name__ == '__main__':
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76 main()