Python使用`time.strftime`在格式化字符串中显示毫秒数

Question

我试图将毫秒格式化为格式化字符串,保留毫秒部分.这是我的代码:

import time

time.strftime('%Y-%m-%d %H:%M:%S:%f', time.gmtime(1515694048121/1000.0))

其中1515694048121是以毫秒为单位的时间.它回报我:

2018-01-11 18:07:28:f

我们可以看到,毫秒时间内没有返回.

包含毫秒时间的正确格式是什么？是'%Y-%m-%d %H:%M:%S:%f'不正确的？

Answer 1

没有提到的指令time.strftime(...)将返回毫秒.不确定从哪里获得使用参考%f.事实上time.gmtime(...),精度只有几秒钟.

作为一个黑客,为了实现这一点,你可以通过保留你的毫秒秒值显式格式化你的字符串:

>>> import time

>>> time_in_ms = 1515694048121
>>> time.strftime('%Y-%m-%d %H:%M:%S:{}'.format(time_in_ms%1000), time.gmtime(time_in_ms/1000.0))
'2018-01-11 18:07:28:121'

这是有效指令列表:

+-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------+
| Directive |                                                                                                   Meaning                                                                                                   | Notes |
+-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------+
| %a        | Locale’s abbreviated weekday name.                                                                                                                                                                          |       |
| %A        | Locale’s full weekday name.                                                                                                                                                                                 |       |
| %b        | Locale’s abbreviated month name.                                                                                                                                                                            |       |
| %B        | Locale’s full month name.                                                                                                                                                                                   |       |
| %c        | Locale’s appropriate date and time representation.                                                                                                                                                          |       |
| %d        | Day of the month as a decimal number [01,31].                                                                                                                                                               |       |
| %H        | Hour (24-hour clock) as a decimal number [00,23].                                                                                                                                                           |       |
| %I        | Hour (12-hour clock) as a decimal number [01,12].                                                                                                                                                           |       |
| %j        | Day of the year as a decimal number [001,366].                                                                                                                                                              |       |
| %m        | Month as a decimal number [01,12].                                                                                                                                                                          |       |
| %M        | Minute as a decimal number [00,59].                                                                                                                                                                         |       |
| %p        | Locale’s equivalent of either AM or PM.                                                                                                                                                                     | (1)   |
| %S        | Second as a decimal number [00,61].                                                                                                                                                                         | (2)   |
| %U        | Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0.                                | (3)   |
| %w        | Weekday as a decimal number [0(Sunday),6].                                                                                                                                                                  |       |
| %W        | Week number of the year (Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0.                                | (3)   |
| %x        | Locale’s appropriate date representation.                                                                                                                                                                   |       |
| %X        | Locale’s appropriate time representation.                                                                                                                                                                   |       |
| %y        | Year without century as a decimal number [00,99].                                                                                                                                                           |       |
| %Y        | Year with century as a decimal number.                                                                                                                                                                      |       |
| %z        | Time zone offset indicating a positive or negative time difference from UTC/GMT of the form +HHMM or -HHMM, where H represents decimal hour digits and M represents decimal minute digits [-23:59, +23:59]. |       |
| %Z        | Time zone name (no characters if no time zone exists).                                                                                                                                                      |       |
| %%        |                                                                                                                                                                                                             |       |
+-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------+