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annotate roundup/anypy/cmp_.py @ 7478:e8d2a4bca16a

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Update index. Add "track your issues your way" tag line and... Add description of benefits to some of the noteworthy changes. Add GTD "thing management" from old email in the 1.6 time period. Reverse order of fast gratification so source directory is first then venv install. Match the first line that says you don't have to install.
author John Rouillard <rouilj@ieee.org>
date Sun, 11 Jun 2023 21:32:46 -0400
parents 142553f58694
children 706f3be6ffbb
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9a09719b0d8e helper to allow comparing dicts and None values in Python 3
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1 try:
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2 None < 0
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3
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4 def NoneAndDictComparable(v):
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5 return v
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6 except TypeError:
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7 # comparator to allow comparisons against None and dict
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8 # comparisons (these were allowed in Python 2, but aren't allowed
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9 # in Python 3 any more)
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10 class NoneAndDictComparable(object):
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11 def __init__(self, value):
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12 self.value = value
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13
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14 def __cmp__(self, other):
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15 if not isinstance(other, self.__class__):
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16 raise TypeError('not comparable')
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17
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18 if self.value == other.value:
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19 return 0
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20
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21 elif self.value is None:
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22 return -1
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23
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24 elif other.value is None:
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25 return 1
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26
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27 elif type(self.value) == tuple and type(other.value) == tuple:
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28 for lhs, rhs in zip(self.value, other.value):
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29 lhsCmp = NoneAndDictComparable(lhs)
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30 rhsCmp = NoneAndDictComparable(rhs)
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31 result = lhsCmp.__cmp__(rhsCmp)
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32 if result != 0:
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33 return result
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34
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35 return len(self.value) - len(other.value)
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36
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37 elif type(self.value) == dict and type(other.value) == dict:
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38 diff = len(self.value) - len(other.value)
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39 if diff == 0:
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40 lhsItems = tuple(sorted(self.value.items(),
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41 key=NoneAndDictComparable))
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42 rhsItems = tuple(sorted(other.value.items(),
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43 key=NoneAndDictComparable))
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44 return -1 if NoneAndDictComparable(lhsItems) < NoneAndDictComparable(rhsItems) else 1
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45 else:
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46 return diff
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47
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48 elif self.value < other.value:
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49 return -1
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50
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51 else:
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52 return 1
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53
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54 def __eq__(self, other):
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55 return self.__cmp__(other) == 0
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57 def __ne__(self, other):
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58 return self.__cmp__(other) != 0
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60 def __lt__(self, other):
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61 return self.__cmp__(other) < 0
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63 def __le__(self, other):
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64 return self.__cmp__(other) <= 0
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66 def __ge__(self, other):
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67 return self.__cmp__(other) >= 0
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69 def __gt__(self, other):
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70 return self.__cmp__(other) > 0
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71
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73 def _test():
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74 Comp = NoneAndDictComparable
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75
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76 assert Comp(None) < Comp(0)
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77 assert Comp(None) < Comp('')
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78 assert Comp(None) < Comp({})
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79 assert Comp((0, None)) < Comp((0, 0))
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80 assert not Comp(0) < Comp(None)
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81 assert not Comp('') < Comp(None)
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82 assert not Comp({}) < Comp(None)
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83 assert not Comp((0, 0)) < Comp((0, None))
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84
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85 assert Comp((0, 0)) < Comp((0, 0, None))
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86 assert Comp((0, None, None)) < Comp((0, 0, 0))
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87
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88 assert Comp(0) < Comp(1)
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89 assert Comp(1) > Comp(0)
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90 assert not Comp(1) < Comp(0)
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91 assert not Comp(0) > Comp(0)
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92
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93 assert Comp({0: None}) < Comp({0: 0})
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94 assert Comp({0: 0}) < Comp({0: 1})
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95
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96 assert Comp({0: 0}) == Comp({0: 0})
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97 assert Comp({0: 0}) != Comp({0: 1})
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98 assert Comp({0: 0, 1: 1}) > Comp({0: 1})
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99 assert Comp({0: 0, 1: 1}) < Comp({0: 0, 2: 2})
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101
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102 if __name__ == '__main__':
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103 _test()
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