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1
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from collections import defaultdict
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2
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from collections import UserDict
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3
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from collections.abc import Iterable
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4
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from collections.abc import Hashable
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5
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from itertools import filterfalse
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6
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7
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8
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class MultivaluedDictError(Exception):
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9
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pass
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10
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11
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class KeyValuePairsError(MultivaluedDictError):
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12
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def __init__(self, list_of_not_kv_pair):
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13
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self.list_of_not_kv_pair = list_of_not_kv_pair
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14
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15
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def __repr__(self):
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16
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return f'{list_of_not_kv_pair} these items do not form key-value pairs. '
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17
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18
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class HashError(MultivaluedDictError):
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19
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def __init__(self, list_of_not_hash):
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20
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self.list_of_not_hash = list_of_not_hash
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21
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22
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def __repr__(self):
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23
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return f'{list_of_not_hash} these are unhashable. '
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24
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25
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class multivalued_dict(UserDict):
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26
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START = 'S'
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27
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END = 'E'
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28
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29
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@classmethod
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30
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def __is_multivalued_dict__(cls, x):
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return (isinstance(x, cls) or ((True if x.default_factory == type([]) else False) if isinstance(x, defaultdict) else False))
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32
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33
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def __init__(*args, **kwargs):
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34
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if args == ():
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35
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raise TypeError("The '__init__' method needs to be instantiated. ")
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36
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self, *args = args
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37
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len_of_args = len(args)
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38
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if len_of_args == 1:
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39
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initial_items = args[0]
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40
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self.data = defaultdict(list)
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41
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if multivalued_dict.__is_multivalued_dict__(initial_items):
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42
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self.__mvdict_init__(initial_items)
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43
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else:
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self.update(initial_items)
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45
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elif len_of_args > 1:
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46
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raise TypeError(f'expected at most 1 arguments, got {len_of_args}')
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47
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if kwargs != dict():
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48
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self.update(kwargs)
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49
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50
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def __mvdict_init__(self, multivalued_init_items):
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51
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if multivalued_dict.__is_multivalued_dict__(multivalued_init_items):
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52
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self.data = multivalued_init_items
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53
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else:
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54
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raise TypeError(f"{type(multivalued_init_items)} objects are not multivalued_dict or defaultdict(<class 'list'>) objects. ")
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55
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56
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def __repr__(self):
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57
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return f'multivalued_dict({dict(self.data)})'
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58
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59
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def __lenvalue__(self, key = None):
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60
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if key is None:
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61
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return sum(map(len, self.data.values()))
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else:
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return len(self.data[key])
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64
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65
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def __matchkv__(self, key, value):
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66
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return value in self.data[key]
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67
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68
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def __delkv__(self, key, value, allkv = True, direction = START):
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69
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assert allkv in (True, False), '"allkv" can only be True or False.'
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70
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assert direction in (self.START, self.END), '"direction" can only be START or END.'
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71
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72
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if allkv:
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73
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while value in self.data[key]:
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74
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self.data[key].remove(value)
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75
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else:
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76
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if direction == self.START:
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self.data[key].remove(value)
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78
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elif direction == self.END:
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79
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value_len = len(self.data[key])
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80
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for i in range(value_len):
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81
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if self.data[key][-1 - i] == value:
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82
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self.data[key].__delitem__(-1 - i)
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83
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break
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84
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85
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def count(self, key, value):
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86
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return self.data[key].count(value)
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87
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88
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def update(*args, **kwargs):
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89
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if args == ():
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90
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raise TypeError("The 'update' method needs to be instantiated. ")
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91
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self, *args = args
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92
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len_of_args = len(args)
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93
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if len_of_args == 1:
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94
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update_items = args[0]
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95
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if isinstance(update_items, Iterable):
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96
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if isinstance(update_items, dict):
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97
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for _key, _value in update_items.items():
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98
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self.data[_key].append(_value)
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99
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else:
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100
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list_of_not_kv_pair = list(filterfalse(lambda item: len(item) == 2, update_items)) #找出不是两个元素的项，也就是无法构成键值对的项
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101
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if list_of_not_kv_pair == []:
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102
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list_of_not_hash = list(filterfalse(lambda _key: isinstance(_key, Hashable), (item[0] for item in update_items)))
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103
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if list_of_not_hash == []: #检测所有键必须可散列
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104
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for _key, _value in update_items:
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105
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self.data[_key].append(_value)
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106
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else:
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107
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raise HashError(list_of_not_hash)
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108
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else:
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109
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raise KeyValuePairsError(list_of_not_kv_pair)
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110
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else:
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111
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raise TypeError(f'{type(update_items)} object is not iterable. ')
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112
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elif len_of_args > 1:
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113
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raise TypeError(f'expected at most 1 arguments, got {len_of_args}')
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114
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if kwargs != dict():
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115
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self.update(kwargs)
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116
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117
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def reverse(self, key):
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118
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self.data[key].reverse()
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119
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120
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def copy(self):
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121
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return multivalued_dict(self.data)
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122
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123
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def items(self):
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124
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return self.data.items()
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125
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126
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def keys(self):
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127
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return self.data.keys()
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128
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129
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def values(self):
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130
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return self.data.values()
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131
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132
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@classmethod
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133
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def fromkeys(cls, iterable, value = None):
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134
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dict_var = dict.fromkeys(iterable, value)
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135
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return cls(dict_var)
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136
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fsssosei /
MultivaluedDict
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