python chr()和ord()

通過help 查看相關(guān)函數(shù)的幫助文檔

>>>help (chr)

chr(...)

? ? chr(i) -> character ? ?

? ? Return a string of one character with ordinal i; 0 <= i < 256.

參數(shù)是0 - 256 的一個(gè)整數(shù)，返回值是當(dāng)前整數(shù)對(duì)應(yīng)的ascii字符。參數(shù)可以是10進(jìn)制也可以是16進(jìn)制的形式

十六進(jìn)制：

>>> print chr(0x30), chr(0x31), chr(0x61)
0 1 a

>>> print chr(48), chr(49), chr(97)
0 1 a

unichr(...)

? ? unichr(i) -> Unicode character? ??
? ? Return a Unicode string of one character with ordinal i; 0 <= i <= 0x10ffff.

unichr()和chr()函數(shù)功能基本一樣， 只不過是返回unicode的字符

ord(...)
? ? ord(c) -> integer
? ??Return the integer ordinal of a one-character string.

參數(shù)是一個(gè)ascii字符，返回值是對(duì)應(yīng)的十進(jìn)制整數(shù)

>>> print ord('a'), ord('0'), ord('1')
97 48 49

>>> print "%x %x %x" % (ord('a'), ord('0'), ord('1'))
61 30 31
>>> print "%#x %#x %#x" % (ord('a'), ord('0'), ord('1'))
0x61 0x30 0x31

比如一個(gè)字符串str1，轉(zhuǎn)化成另一個(gè)字符串str2， 使得 str2[i] = str1[i] - i

str1 = "eb;3ej8h"
>>> for i in range(0, len(str1)):
...     print chr((ord(str1[i])-i)),
... 
e a 9 0 a e 2 a