ASCII码与字符互转，python

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ord()：字符转成ASCII码，参数为字符。
chr()：ASCII码转成字符，参数为数字（0-127）

>>> help(ord)    # ord的帮助文档
Help on built-in function ord in module builtins:
ord(c, /)
    Return the Unicode code point for a one-character string.

>>> help(chr)    # chr的帮助文档
Help on built-in function chr in module builtins:
chr(i, /)
    Return a Unicode string of one character with ordinal i; 0 <= i <= 0x10ffff.

>>> ord('a')    # 例子
97
>>> chr(97)
'a'