如何在 Python 中用空格将字符串填充到固定长度?

问题描述

我确信这在很多地方都有介绍，但我不知道我正在尝试执行的操作的确切名称，所以我无法真正查找它.我已经阅读了 30 分钟的官方 Python 书籍，试图找出如何做到这一点.

I'm sure this is covered in plenty of places, but I don't know the exact name of the action I'm trying to do so I can't really look it up. I've been reading an official Python book for 30 minutes trying to find out how to do this.

问题:我需要在一定长度的字段"中放入一个字符串.

Problem: I need to put a string in a certain length "field".

例如，如果姓名字段有 15 个字符长，而我的名字是 John，我会得到John"后跟 11 个空格来创建 15 个字符的字段.

For example, if the name field was 15 characters long, and my name was John, I would get "John" followed by 11 spaces to create the 15 character field.

我需要它适用于为变量name"输入的任何字符串.

I need this to work for any string put in for the variable "name".

我知道这可能是某种形式的格式，但我找不到执行此操作的确切方法.帮助将不胜感激.

I know it will likely be some form of formatting, but I can't find the exact way to do this. Help would be appreciated.

推荐答案

这是超级简单的format:

>>> a = "John"
>>> "{:<15}".format(a)
'John           '

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