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Engou

菜鸟求大大们解释Python里str函数和repr函数的区别......
他们的各自在什么情况下使用......
他们之间有啥联系.....

最佳答案

月排行榜 / 总排行榜

新手·ing

2017-3-11 16:13:01

str()一般是将数值转成字符串。
repr()是将一个对象转成字符串显示，注意只是显示用，有些对象转成字符串没有直接的意思。如list,dict使用str()是无效的，但使用repr可以，这是为了看它们都有哪些值，为了显示之用。
The str() function is meant to return representations of values which are fairly
human-readable, while repr() is meant to generate representations which can be read by
the interpreter (or will force a SyntaxError if there is not equivalent syntax). For
objects which don't have a particular representation for human consumption, str() will
return the same value as repr(). Many values, such as numbers or structures like lists
and dictionaries, have the same representation using either function. Strings and
floating point numbers, in particular, have two distinct representations.

Some examples:


>>> s = 'Hello, world.'

>>> str(s)

'Hello, world.'

>>> repr(s)

"'Hello, world.'"

>>> str(0.1)

'0.1'

>>> repr(0.1)

'0.10000000000000001'

>>> x = 10 * 3.25

>>> y = 200 * 200

>>> s = 'The value of x is ' + repr(x) + ', and y is ' + repr(y) + '...'

>>> print s

The value of x is 32.5, and y is 40000...

>>> # The repr() of a string adds string quotes and backslashes:

... hello = 'hello, world\n'

>>> hellos = repr(hello)

>>> print hellos

'hello, world\n'

>>> # The argument to repr() may be any Python object:

... repr((x, y, ('spam', 'eggs')))

"(32.5, 40000, ('spam', 'eggs'))"

>>> # reverse quotes are convenient in interactive sessions:

... `x, y, ('spam', 'eggs')`

"(32.5, 40000, ('spam', 'eggs'))"

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hldh214

http://blog.csdn.net/u013961718/article/details/51100464

donkkong

学习了

新手·ing

str()一般是将数值转成字符串。
repr()是将一个对象转成字符串显示，注意只是显示用，有些对象转成字符串没有直接的意思。如list,dict使用str()是无效的，但使用repr可以，这是为了看它们都有哪些值，为了显示之用。
The str() function is meant to return representations of values which are fairly
human-readable, while repr() is meant to generate representations which can be read by
the interpreter (or will force a SyntaxError if there is not equivalent syntax). For
objects which don't have a particular representation for human consumption, str() will
return the same value as repr(). Many values, such as numbers or structures like lists
and dictionaries, have the same representation using either function. Strings and
floating point numbers, in particular, have two distinct representations.

Some examples:


>>> s = 'Hello, world.'

>>> str(s)

'Hello, world.'

>>> repr(s)

"'Hello, world.'"

>>> str(0.1)

'0.1'

>>> repr(0.1)

'0.10000000000000001'

>>> x = 10 * 3.25

>>> y = 200 * 200

>>> s = 'The value of x is ' + repr(x) + ', and y is ' + repr(y) + '...'

>>> print s

The value of x is 32.5, and y is 40000...

>>> # The repr() of a string adds string quotes and backslashes:

... hello = 'hello, world\n'

>>> hellos = repr(hello)

>>> print hellos

'hello, world\n'

>>> # The argument to repr() may be any Python object:

... repr((x, y, ('spam', 'eggs')))

"(32.5, 40000, ('spam', 'eggs'))"

>>> # reverse quotes are convenient in interactive sessions:

... `x, y, ('spam', 'eggs')`

"(32.5, 40000, ('spam', 'eggs'))"

五行缺五行

str()一般是将数值转成字符串。 repr()是将一个对象转成字符串显示。