# python 字符和数值转换
### 字符转数值
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- ord('A') ==> 65
- ord('B') ==> 66
- ord('a') ==> 97
- ord('b') ==> 98
### 数值转字符
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- chr(65) ==> 'A'
- chr(66) ==> 'B'
- chr(97) ==> 'a'
- chr(98) ==> 'b'