如何在Python 3中使用前导零填充字符串 [英] How to pad a string with leading zeros in Python 3

问题描述

我正在尝试在Python 3中制作length = 001，但是每当我尝试将其打印出来时，它都会截断没有前导零(length = 1)的值.我如何停止这种情况而不必在打印出来之前将length强制转换为字符串?

I'm trying to make length = 001 in Python 3 but whenever I try to print it out it truncates the value without the leading zeros (length = 1). How would I stop this happening without having to cast length to a string before printing it out?

推荐答案

使用zfill()辅助方法将任何字符串，整数或带零的浮点数左移；对于 Python 2.x 和 Python 3.x .

Make use of the zfill() helper method to left-pad any string, integer or float with zeros; it's valid for both Python 2.x and Python 3.x.

示例用法:

print str(1).zfill(3);
# Expected output: 001

说明:

应用于值时，当初始 string 值的长度小于所应用的 width 值的长度时，zfill()返回一个用零填充的值，否则为 string 的初始值.

When applied to a value, zfill() returns a value left-padded with zeros when the length of the initial string value less than that of the applied width value, otherwise, the initial string value as is.

语法:

str(string).zfill(width)
# Where string represents a string, an integer or a float, and
# width, the desired length to left-pad.

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