blocks|key|840040|text|您可以使用datetime的strftime函数来实现此目的。问题是时间的strftime接受的时间倍数并不携带微秒级的信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|840041|from+datetime+import+datetime
datetime.now().strftime("%25H:%25M:%25S.%25f")|code-block|syntax|javascript|840042|应该能起到作用！|840043|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can use datetime's strftime function to get this. The problem is that time's strftime accepts a timetuple that does not carry microsecond information.

<pre><code>from datetime import datetime
datetime.now().strftime("%H:%M:%S.%f")
</code></pre>

Should do the trick!

blocks|key|624115|text|您正在查看错误的文档。time模块has+different+documentation。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|624116|您可以像这样使用datetime模块strftime：|624117|>>>+from+datetime+import+datetime
>>>
>>>+now+=+datetime.now()
>>>+now.strftime("%25H:%25M:%25S.%25f")
'12:19:40.948000'|code-block|syntax|javascript|624118|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.python.org/2/library/time.html#time.strftime|1|http://docs.python.org/2/library/datetime.html#strftime-strptime-behavior^0|B|4|H|R|0|0|8|8|I|8|I|8|1|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|H|3|I|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

You are looking at the wrong documentation. The <code>time</code> module <a href="http://docs.python.org/2/library/time.html#time.strftime" rel="noreferrer">has different documentation</a>. 

You can use the <code>datetime</code> module <a href="http://docs.python.org/2/library/datetime.html#strftime-strptime-behavior" rel="noreferrer"><code>strftime</code></a> like this:

<pre><code>&gt;&gt;&gt; from datetime import datetime
&gt;&gt;&gt;
&gt;&gt;&gt; now = datetime.now()
&gt;&gt;&gt; now.strftime("%H:%M:%S.%f")
'12:19:40.948000'
</code></pre>

blocks|key|840110|text|这样就可以完成工作了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|840111|import+datetime
datetime.datetime.now().strftime("%25H:%25M:%25S.%25f")|code-block|syntax|javascript|840112|它将打印出来|840113|像这样的HH:MM:SS.microseconds例如14:38:19.425961|offset|length|style|CODE|840114|entityMap^0|0|0|0|4|L|R|F|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]|$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

This should do the work

<pre><code>import datetime
datetime.datetime.now().strftime("%H:%M:%S.%f")
</code></pre>

It will print 

<code>HH:MM:SS.microseconds</code> like this e.g <code>14:38:19.425961</code>

blocks|key|624184|text|您还可以使用其time()函数从time模块获得微秒级精度。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|624185|(time.time()返回从纪元开始的时间，以秒为单位。它的小数部分是以微秒为单位的时间，这就是您想要的。)|624186|>>>+from+time+import+time
>>>+time()
...+1310554308.287459+++#+the+fractional+part+is+what+you+want.


#+comparision+with+strftime+-
>>>+from+datetime+import+datetime
>>>+from+time+import+time
>>>+datetime.now().strftime("%25f"),+time()
...+('287389',+1310554310.287459)|code-block|syntax|javascript|624187|entityMap^0|7|6|G|4|0|1|B|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

You can also get microsecond precision from the <code>time</code> module using its <code>time()</code> function. 
(<code>time.time()</code> returns the time in seconds since epoch. Its fractional part is the time in microseconds, which is what you want.)

<pre><code>&gt;&gt;&gt; from time import time
&gt;&gt;&gt; time()
... 1310554308.287459 # the fractional part is what you want.


# comparision with strftime -
&gt;&gt;&gt; from datetime import datetime
&gt;&gt;&gt; from time import time
&gt;&gt;&gt; datetime.now().strftime("%f"), time()
... ('287389', 1310554310.287459)
</code></pre>

blocks|key|624218|text|当微秒"%25f“不起作用时，请使用以下方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|624219|import+datetime

def+getTimeStamp():
++++dt+=+datetime.datetime.now()
++++return+dt.strftime("%25Y%25j%25H%25M%25S")+%2B+str(dt.microsecond)|code-block|syntax|javascript|624220|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

When the "%f" for micro seconds isn't working, please use the following method:

<pre><code>import datetime

def getTimeStamp():
 dt = datetime.datetime.now()
 return dt.strftime("%Y%j%H%M%S") + str(dt.microsecond)
</code></pre>

blocks|key|840213|text|如果你想要一个整数，试试下面的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|840214|import+datetime
print(datetime.datetime.now().strftime("%25s%25f")[:13])|code-block|syntax|javascript|840215|输出：|840216|1545474382803|840217|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you want an integer, try this code:

<pre><code>import datetime
print(datetime.datetime.now().strftime("%s%f")[:13])
</code></pre>

Output:

<pre><code>1545474382803
</code></pre>

blocks|key|624400|text|如果你想要速度，试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|624401|def+_timestamp(prec=0):
++++t+=+time.time()
++++s+=+time.strftime("%25H:%25M:%25S",+time.localtime(t))
++++if+prec+>+0:
++++++++s+%2B=+("%25.9f"+%25+(t+%25+1,))[1:2%2Bprec]
++++return+s|code-block|syntax|javascript|624402|其中prec是精度--您想要的小数位数。请注意，该函数在小数部分没有前导零的问题，就像这里介绍的一些其他解决方案一样。|offset|length|style|CODE|624403|entityMap^0|0|0|2|4|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you want speed, try this:

<pre><code>def _timestamp(prec=0):
 t = time.time()
 s = time.strftime("%H:%M:%S", time.localtime(t))
 if prec &gt; 0:
 s += ("%.9f" % (t % 1,))[1:2+prec]
 return s
</code></pre>

Where <code>prec</code> is precision -- how many decimal places you want.
Please note that the function does not have issues with leading zeros in fractional part like some other solutions presented here.

I'm trying to use strftime() to microsecond precision, which seems possible using %f (as stated <a href="http://docs.python.org/library/datetime.html#strftime-strptime-behavior" rel="noreferrer">here</a>). However when I try the following code:

<pre><code>import time
import strftime from time

print strftime("%H:%M:%S.%f")
</code></pre>

...I get the hour, the minutes and the seconds, but %f prints as %f, with no sign of the microseconds. I'm running Python 2.6.5 on Ubuntu, so it should be fine and %f should be supported (it's supported for 2.6 and above, as far as I know.)

Using %f with strftime() in Python to get microseconds

Python

Ubuntu

我正在尝试使用strftime()达到微秒级的精度，使用%f (如所述)似乎可以做到这一点。但是，当我尝试以下代码时：import timeimport strftime from timeprint strftime("%H:%M:%S.%f")...I获取小时、分钟和秒，但%f打印为%f，没有微秒符号。我在Ubuntu上运行Python 2.6.5，所以它应该很好，并且应该支持%f (据我所知

问在Python中使用%f和strftime()来获取微秒
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