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annotate python/example/possibilities.py @ 837:5ba219864529

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add example program
author Jeff Hammel <k0scist@gmail.com>
date Mon, 27 Mar 2017 14:05:29 -0700
parents ef6731a4ad86
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1 #!/usr/bin/env python
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2
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3 """
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4 """
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5
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6 # imports
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7 import argparse
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8 import sys
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9 import time
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10 from pprint import pprint
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11
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12 costs = {1:1,
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13 7:3,
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14 30:25}
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15
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16 A = [1, 2, 4, 5, 7, 29, 30]
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17
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18 def possibilities(A):
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19 possibilities = [[(1, date) for date in A]]
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20 for_consideration = [0]
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21 while True:
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22 if not for_consideration:
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23 break
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24 _for_consideration = []
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25 for item in for_consideration:
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26 basis = possibilities[item][:]
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27 tickets = [i[0] for i in basis]
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28 if set(tickets) == set([7]):
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29 continue
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30 index = 0
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31 potential = []
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32 while True:
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33 try:
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34 pos = tickets.find(1, index)
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35 except ValueError:
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36 break
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37 potential = basis[:]
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38 potential[pos] = (7, basis[pos][-1])
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39
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40 try:
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41 while A[index] < date+6:
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42 index += 1
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43 except IndexError:
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44 pass
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45
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46 return possibilities
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47
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48
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49 def fill_space(A, spans):
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50 """
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51 A -- the space to be filled
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52 spans -- the discrete length of each space
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53 """
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54 if not A:
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55 return []
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56
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57 A = sorted(A)
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58
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59 possibilities = []
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60
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61 # [(ticket_value, index_into_A)]
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62 working_set = [[(value, 0)] for value in spans]
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63 # print "working set"
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64 # pprint(working_set)
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65 while working_set:
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66 item = working_set.pop()
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67 last_span, index = item[-1]
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68 last_date = A[index]
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69 e = None
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70 index += 1
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71 try:
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72 while last_date + last_span > A[index]:
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73 # print ('index: {}'.format(index))
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74 index += 1
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75 except IndexError as e:
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76 possibilities.append(item)
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77 continue
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78
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79 # print "item:"
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80 # pprint(item)
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81 extension = [item[:] + [(span, index)]
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82 for span in spans]
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83
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84 working_set.extend(extension)
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85
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86 # fill possibility indices with dates
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87 retval = [[(A[index], span) for span, index in possibility]
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88 for possibility in possibilities]
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89 return retval
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90
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91
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92 def sorted_costs(A, costs=tuple(costs.items())):
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93
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94 costs = dict(costs)
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95
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96 # determine possibility spaces
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97 spaces = fill_space(A, spans=costs.keys())
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98
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99 # determine costs
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100 retval = []
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101 for space in spaces:
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102 cost = sum([costs[value] for date, value in space])
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103 retval.append((cost, space))
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104
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105 # sort by cost
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106 retval.sort(key=lambda x: x[0])
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107
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108 return retval
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109
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110 if __name__ == '__main__':
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111
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112 parser = argparse.ArgumentParser(description=__doc__)
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113 options = parser.parse_args()
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114
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115 dates = sorted(A)
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116
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117 print "Dates: {}".format(', '.join([str(i) for i in dates]))
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118 for cost, value in sorted_costs(A, costs):
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119 print ("{} : {}".format(cost, value))