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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 Histograms
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6
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7 Unicode is awesome; see http://www.alanwood.net/unicode/block_elements.html
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8 """
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9
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10 blocks = """
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11 █
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12 ▉
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13 ▊
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14 ▋
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15 ▌
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16 ▍
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17 ▎
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18 ▏
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19 """
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20
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21 # imports
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22 import argparse
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23 import os
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24 import sys
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25 import time
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26 from .data import transpose
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27 from .read import CSVParser
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64
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28 from collections import OrderedDict
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63
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29
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30 # module globals
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31 __all__ = ['Histogram', 'HistogramParser', 'main']
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32
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33 class Histogram(object):
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34 """historgram"""
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35
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36 def __init__(self, bins):
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37 self.bins = sorted(bins)
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38 assert len(bins) > 1
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39 self.data = OrderedDict([(bin, [])
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40 for bin in zip(bins[:-1],
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41 bins[1:])])
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42
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43 def add(self, *values):
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44 """add values to the histogram"""
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45 for value in values:
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46 for vmin, vmax in self.data.keys():
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47 if vmin <= value < vmax:
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48 self.data[(vmin, vmax)].append(value)
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49 break
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50 else:
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51 if value == vmax:
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52 # handle rightmost endpoint
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53 self.data[(vmin, vmax)].append(value
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54
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55 def __iadd__(self, value):
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56 self.add(value)
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57 return self
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58
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59 def __call__(self, *values):
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60 """
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61 add values to the histogram and return
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62 OrderedDict of counts
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63 """
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64 self.add(*values)
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65 return OrderedDict([(bin, len(value))
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66 for bin, value in self.data.items()])
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67
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68 def keys(self):
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69 return self.data.keys()
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71
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70
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71 def max(self):
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72 """return max length"""
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73 return max([len(value) for value in self.data.values()])
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74
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75
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76 class HistogramParser(CSVParser):
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77 """histogram CLI option parser"""
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78
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79 def __init__(self, **kwargs):
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80 kwargs.setdefault('formatter_class', argparse.RawTextHelpFormatter)
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81 kwargs.setdefault('description', __doc__)
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82 CSVParser.__init__(self, **kwargs)
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83 self.add_argument('-n', '--bins', dest='n_bins', type=int,
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84 help="number of bins")
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85 self.add_argument('--min', dest='min', type=float,
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86 help="minimum value; else taken from data")
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87 self.add_argument('--max', dest='max', type=float,
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88 help="maximum value, else taken from data")
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89 self.options = None
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90
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91
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92 def main(args=sys.argv[1:]):
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93 """CLI"""
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94
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95 # parse command line options
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96 parser = HistogramParser()
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97 options = parser.parse_args(args)
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98
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99 # read data
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100 data = parser.read()
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101 if not data:
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102 parser.error("No data given")
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103
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104 # transpose to columns
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105 columns = transpose(data)
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106
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107
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108 if __name__ == '__main__':
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109 main()
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