回答編集履歴
3
修正
test
CHANGED
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@@ -102,7 +102,7 @@
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102
102
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else:
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105
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-
words_dic[word] =
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105
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words_dic[word] = 1
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```
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2
追記
test
CHANGED
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@@ -83,3 +83,63 @@
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83
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words_dic[word] = new_cnt # 更新した個数を登録
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84
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```
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86
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+
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87
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89
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おまけ： カウント処理いろいろ
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90
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91
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---
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92
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93
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**明示的に分岐する方法**
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94
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95
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```Python
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96
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97
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for word in words:
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99
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if word in words_dic:
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words_dic[word] += 1
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102
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103
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else:
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104
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105
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words_dic[word] = 0
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106
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107
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```
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108
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109
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110
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111
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**defaultdictを利用する方法**
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112
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113
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```Python
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114
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115
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import collections
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116
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117
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118
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119
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words_dic = collections.defaultdict(int)
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120
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121
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...
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125
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for word in words:
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126
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127
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words_dic[word] += 1
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128
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129
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```
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130
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131
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132
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133
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**Counterを利用する方法**
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134
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135
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```Python
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136
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import collections
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138
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140
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141
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...
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142
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143
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words_dic = collections.Counter(words)
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144
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145
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```
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1
追記
test
CHANGED
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@@ -65,3 +65,21 @@
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65
65
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66
66
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67
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カウントアップ処理にはぴったりのメソッドですね。
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68
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69
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70
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71
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---
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72
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73
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ともすれば次のように冗長に書いた方が、**今は**分かり易いかもしれません。
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74
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75
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```Python
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for word in words:
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78
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now_cnt = words_dic.get(word, 0) # 現状の個数を獲得 (登録されていない場合は0)
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80
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81
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new_cnt = now_cnt + 1 # 個数を更新
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82
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83
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words_dic[word] = new_cnt # 更新した個数を登録
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84
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85
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```
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