blocks|key|2951169|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2951170|为什么我必须传递秒=运行时间到时间增量|blockquote|2951171|2951172|2951173|因为timedelta对象可以传递秒、毫秒、天等。因此，您需要指定要传递的内容(这就是使用显式键的原因)。将类型转换为int是多余的，因为它们也可以接受浮点数。|offset|length|style|CODE|2951174|2951175|，为什么字符串转换工作得如此好，以至于我得到了HH:MM:SS？|2951176|2951177|2951178|格式化的不是类型转换，而是对象的内部__str__方法。实际上，如果您编写以下代码，将获得相同的结果：|2951179|print(datetime.timedelta(seconds=int(uptime)))|code-block|syntax|javascript|2951180|entityMap^0|0|0|0|0|1N|3|0|0|0|0|0|I|7|0|0^^$0|@$1|2|3|-4|4|5|6|Z|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|10|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|11|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|12|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|13|7|@$H|14|I|15|J|K]]|8|@]|9|$]]|$1|L|3|-4|4|5|6|16|7|@]|8|@]|9|$]]|$1|M|3|N|4|C|6|17|7|@]|8|@]|9|$]]|$1|O|3|-4|4|5|6|18|7|@]|8|@]|9|$]]|$1|P|3|-4|4|5|6|19|7|@]|8|@]|9|$]]|$1|Q|3|R|4|5|6|1A|7|@$H|1B|I|1C|J|K]]|8|@]|9|$]]|$1|S|3|T|4|U|6|1D|7|@]|8|@]|9|$V|W]]|$1|X|3|-4|4|5|6|1E|7|@]|8|@]|9|$]]]|Y|$]]

<blockquote>
why do I have to pass seconds = uptime to timedelta
</blockquote>
Because timedelta objects can be passed seconds, milliseconds, days, etc... so you need to specify what are you passing in (this is why you use the explicit key). Typecasting to <code>int</code> is superfluous as they could also accept floats.
<blockquote>
and why does the string casting works so nicely that I get HH:MM:SS ?
</blockquote>
It's not the typecasting that formats, is the internal <code>__str__</code> method of the object. In fact you will achieve the same result if you write:
<pre><code>print(datetime.timedelta(seconds=int(uptime)))
</code></pre>

blocks|key|264122|text|因为时间增量的定义如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|264123|class+datetime.timedelta([days,]+[seconds,]+[microseconds,]+[milliseconds,]+[minutes,]+[hours,]+[weeks])|code-block|syntax|javascript|264124|所有参数都是可选的，默认为0。|264125|你可以很容易地用可选参数说“三天零四毫秒”。|264126|>>>+datetime.timedelta(days=3,+milliseconds=4)
datetime.timedelta(3,+0,+4000)
>>>+datetime.timedelta(3,+0,+0,+4)+#no+need+for+that.
datetime.timedelta(3,+0,+4000)|264127|对于字符串转换，它返回一个很好的格式化的值，而不是__repr__，以提高可读性。来自文档：|offset|length|style|CODE|264128|264129|+str(+t+)返回形式为D+day[s]，H:MM:SS.UUUUUU的字符串，其中D表示负t。(5)|blockquote|264130|264131|264132|>>>+datetime.timedelta(seconds+=+42).__repr__()
'datetime.timedelta(0,+42)'
>>>+datetime.timedelta(seconds+=+42).__str__()
'0:00:42'|264133|检出文档：|264134|http://docs.python.org/library/datetime.html#timedelta-objects|264135|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|P|8|0|0|0|0|0|0|0|0|1Q|0|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1C|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1D|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|1E|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|1G|8|@$O|1H|P|1I|Q|R]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|T|3|U|5|V|7|1K|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|1N|8|@]|9|@]|A|$E|F]]|$1|10|3|11|5|6|7|1O|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|1P|8|@]|9|@$O|1Q|P|1R|1|1S]]|A|$]]|$1|14|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|13]]]]

Because timedelta is defined like:

<pre><code>class datetime.timedelta([days,] [seconds,] [microseconds,] [milliseconds,] [minutes,] [hours,] [weeks])
</code></pre>

All arguments are optional and default to 0.

You can easily say "Three days and four milliseconds" with optional arguments that way.

<pre><code>&gt;&gt;&gt; datetime.timedelta(days=3, milliseconds=4)
datetime.timedelta(3, 0, 4000)
&gt;&gt;&gt; datetime.timedelta(3, 0, 0, 4) #no need for that.
datetime.timedelta(3, 0, 4000)
</code></pre>

And for str casting, it returns a nice formatted value instead of <code>__repr__</code> to improve readability. From docs:

<blockquote>
 str(t) Returns a string in the form [D day[s], ][H]H:MM:SS[.UUUUUU],
 where D is negative for negative t. (5)
</blockquote>

<pre><code>&gt;&gt;&gt; datetime.timedelta(seconds = 42).__repr__()
'datetime.timedelta(0, 42)'
&gt;&gt;&gt; datetime.timedelta(seconds = 42).__str__()
'0:00:42'
</code></pre>

Checkout documentation:

<a href="http://docs.python.org/library/datetime.html#timedelta-objects" rel="noreferrer">http://docs.python.org/library/datetime.html#timedelta-objects</a>

Given the python code below, please help me understand what is happening there.

<pre><code>start_time = time.time()
time.sleep(42)
end_time = time.time()

uptime = end_time - start_time

human_uptime = str(datetime.timedelta(seconds=int(uptime)))
</code></pre>

So I get the difference between <code>start time</code> and <code>end time</code>, on line 5 I round up the duration by casting and what now, what's the further explanation?

I know what delta means(average or difference), but why do I have to pass <code>seconds = uptime</code> to <code>timedelta</code> and why does the string casting works so nicely that I get <code>HH:MM:SS</code> ?

Understanding timedelta

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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考虑到下面的python代码，请帮助我理解那里发生了什么。start_time = time.time()time.sleep(42)end_time = time.time()uptime = end_time - start_timehuman_uptime = str(datetime.timedelta(sec...

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