Python 日期时间 : strftime() codes for decimal numbers

Question

为什么会报错？

>>> an = datetime.datetime.now(); an
datetime.datetime(2020, 3, 8, 22, 52, 19, 256487)
>>> datetime.datetime.strftime(an, '%-d')
Traceback (most recent call last):
  File "<pyshell#16>", line 1, in <module>
    datetime.datetime.strftime(an, '%-d')
ValueError: Invalid format string

基于此来源(sources1，sources2)我预计 “8”

Answer 1

page you linked说:

The Python docs contain all the format codes that the C standard (1989 version) requires, and these work on all platforms with a standard C implementation. Note that the 1999 version of the C standard added additional format codes. These include codes for non-zero-padded numbers, that can be obtained by appending a dash (-) (UNIX) or hash (#) (Windows) after the percent (%) sign.

因此，这适用于 Linux:

datetime.datetime.strftime(an, '%-d')

这适用于 Windows:

datetime.datetime.strftime(an, '%#d')

有趣的是，我在 Python strftime docs 中没有看到他们中的任何一个被提及。 .整个功能在 Python 中也可能是无意的。