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python3.x - Python3,关于str.format的语法

描述问题

format的用法,代码中的!r !s分别是format的哪部分用法
我查阅文档, 未能找到这部分的说明(https://docs.python.org/3/lib...

使用搜索引擎,也不知如何组织关键词

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  1. Python3

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相关代码

class Pair:
    def __init__(self, x, y):
        self.x = x
        self.y = y
    def __repr__(self):
        return 'Pair({0.x!r}, {0.y!r})'.format(self)
    def __str__(self):
        return '({0.x!s}, {0.y!s})'.format(self)
        
        
 >>> p = Pair(3, 4)
>>> p
Pair(3, 4) # __repr__() output
>>> print(p)
(3, 4) # __str__() output
PHP中文网PHP中文网2764 days ago709

reply all(1)I'll reply

  • PHP中文网

    PHP中文网2017-04-18 09:41:25

    !r 就是 repr
    !s 就是 str
    !a 就是 ascii

    Three conversion flags are currently supported: '!s' which calls str() on the value, '!r' which calls repr() and '!a' which calls ascii().

    Some examples:

    "Harold's a clever {0!s}"     # Calls str() on the argument first
    "Bring out the holy {name!r}"  # Calls repr() on the argument first
    "More {!a}"          # Calls ascii() on the argument first

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