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annotate lemuriformes/uniques.py @ 17:4793f99b73e0

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[lemuriformes] utility functions
author Jeff Hammel <k0scist@gmail.com>
date Sun, 10 Dec 2017 17:42:52 -0800
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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 count uniques in each CSV file column
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6 """
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7
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8 import argparse
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9 import csv
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10 import sys
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11 from collections import OrderedDict
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12 from .columns import read_columns
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13
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14
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15 def uniques(fp):
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16 """get unique counts for columns in CSV file `fp`"""
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17
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18 # read columns
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19 columns = read_columns(fp, type=OrderedDict)
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20
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21 # convert to sets
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22 for key, value in columns.iteritems():
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23 columns[key] = set(value)
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24
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25 return columns
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26
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28 def main(args=sys.argv[1:]):
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29 """CLI"""
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30
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31 # parse command line
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32 parser = argparse.ArgumentParser(description=__doc__)
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33 parser.add_argument('input',
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34 type=argparse.FileType('r'),
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35 help="input CSV file with headers")
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36 options = parser.parse_args(args)
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37
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38 # determine sets
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39 columns = uniques(options.input)
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40
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41 # output uniques
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42 writer = csv.writer(sys.stdout)
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43 for key, value in columns.iteritems():
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44 writer.writerow([key, len(value)])
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45
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46
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47 if __name__ == '__main__':
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48 main()