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Starting from Python 2.6, a new function str.format() for formatting strings has been added, which enhances the function of string formatting.
The basic syntax is to replace the previous % with {} and :.
The format function can accept unlimited parameters, and the positions do not need to be in order.
Example
>>>"{} {}".format("hello", "world") # 不设置指定位置,按默认顺序 'hello world' >>> "{0} {1}".format("hello", "world") # 设置指定位置 'hello world' >>> "{1} {0} {1}".format("hello", "world") # 设置指定位置 'world hello world'
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