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Python通过format函数格式化显示值

2020-10-17

英文文档:

format(value[, format_spec])

Convert a value to a “formatted” representation, as controlled by format_spec. The interpretation of format_spec will depend on the type of the value argument, however there is a standard formatting syntax that is used by most built-in types: Format Specification Mini-Language.

The default format_spec is an empty string which usually gives the same effect as calling str(value).

A call to format(value, format_spec) is translated to type(value).__format__(value, format_spec) which bypasses the instance dictionary when searching for the value’s __format__() method. A TypeError exception is raised if the method search reaches object and the format_spec is non-empty, or if either the format_spec or the return value are not strings.

  格式化显示值

说明:

  1. 函数功能将一个数值进行格式化显示。

  2. 如果参数format_spec未提供,则和调用str(value)效果相同,转换成字符串格式化。

  3. 对于不同的类型,参数format_spec可提供的值都不一样

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