1 >>> s = 'Hello, world.' 2 >>> str(s) 3 'Hello, world.' 4 >>> repr(s) 5 "'Hello, world.'" 6 >>> str(1.0/7.0) 7 '0.142857142857' 8 >>> repr(1.0/7.0) 9 '0.14285714285714285' 10 >>> x = 10 * 3.25 11 >>> y = 200 * 200 12 >>> s = 'The value of x is ' + repr(x) + ', and y is ' + repr(y) + '...' 13 >>> print s 14 The value of x is 32.5, and y is 40000... 15 >>> # The repr() of a string adds string quotes and backslashes: 16 ... hello = 'hello, world ' 17 >>> hellos = repr(hello) 18 >>> print hellos 19 'hello, world ' 20 >>> # The argument to repr() may be any Python object: 21 ... repr((x, y, ('spam', 'eggs'))) 22 "(32.5, 40000, ('spam', 'eggs'))"
一种是通过str函数，他会把值转换为合理形式的字符串，以便用户可以理解；另一种是通过repr函数，她会创建一个字符串，以合法的Python表达式的形式来表示值。
repr也可以做``反引号的实现。如果希望答应一个包含数字的句子，那么反引号就很有用了。比如：
1 >>> temp = 100 2 >>> print 'hello' + temp 3 4 Traceback (most recent call last): 5 File "<pyshell#1>", line 1, in <module> 6 print 'hello' + temp 7 TypeError: cannot concatenate 'str' and 'int' objects 8 >>> print 'hello'+`temp` 9 hello100