在 Python 中将数字格式化为字符串 [英] Format numbers to strings in Python

问题描述

我需要了解如何将数字格式化为字符串.我的代码在这里:

I need to find out how to format numbers as strings. My code is here:

return str(hours)+":"+str(minutes)+":"+str(seconds)+" "+ampm

小时和分钟是整数，秒是浮点数.str() 函数会将所有这些数字转换为十分之一 (0.1) 的位置.因此，不是我的字符串输出5:30:59.07 pm"，而是显示类似5.0:30.0:59.1 pm"的内容.

Hours and minutes are integers, and seconds is a float. the str() function will convert all of these numbers to the tenths (0.1) place. So instead of my string outputting "5:30:59.07 pm", it would display something like "5.0:30.0:59.1 pm".

最重要的是，我需要什么库/函数来为我做这件事?

Bottom line, what library / function do I need to do this for me?

推荐答案

从 Python 3.6 开始，可以使用 格式化字符串文字 或f-strings:

Starting with Python 3.6, formatting in Python can be done using formatted string literals or f-strings:

hours, minutes, seconds = 6, 56, 33
f'{hours:02}:{minutes:02}:{seconds:02} {"pm" if hours > 12 else "am"}'

或str.format从 2.7 开始的函数:

or the str.format function starting with 2.7:

"{:02}:{:02}:{:02} {}".format(hours, minutes, seconds, "pm" if hours > 12 else "am")

或字符串格式%运算符适用于更旧版本的Python，但请参阅文档中的注释:

or the string formatting % operator for even older versions of Python, but see the note in the docs:

"%02d:%02d:%02d" % (hours, minutes, seconds)

对于格式化时间的具体情况，有 time.strftime:

And for your specific case of formatting time, there’s time.strftime:

import time

t = (0, 0, 0, hours, minutes, seconds, 0, 0, 0)
time.strftime('%I:%M:%S %p', t)

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