blocks|key|574987|text|导入日期|type|unstyled|depth|inlineStyleRanges|entityRanges|data|574988|https://docs.python.org/3/library/datetime.html|offset|length|574989|然后，您可以使用各种函数(时间或时间增量)来设置时间。|574990|timeNow+=+datetime.datetime()打印timeNow|574991|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@$D|S|E|T|1|U]]|A|$]]|$1|F|3|G|5|6|7|V|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|C]]]]

import datetime

<a href="https://docs.python.org/3/library/datetime.html" rel="nofollow noreferrer">https://docs.python.org/3/library/datetime.html</a>

You can then use the various functions (time or timedelta) to set a time.

timeNow = datetime.datetime()
print timeNow

blocks|key|1206857|text|您可以将其设置为cron作业，然后在time+x启动作业，并在time+x停止。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1206858|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You could set this up as a cron job and start the job at time x and stop at time x.

blocks|key|575029|text|import+datetime

while+datetime.datetime.now().hour+<+18:
++++do+stuff...|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|575030|或|unstyled|575031|if+datetime.datetime.now().hour+>=+18:
++++return|575032|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>import datetime

while datetime.datetime.now().hour &lt; 18:
 do stuff...
</code></pre>

or

<pre><code>if datetime.datetime.now().hour &gt;= 18:
 return
</code></pre>

blocks|key|2757365|text|您可以创建一个以小时和分钟为参数的函数，并在while循环中执行检查：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2757366|import+datetime

def+proc(h,+m):
++++while+True:
++++++++currentHour+=+datetime.datetime.now().hour
++++++++currentMinute+=+datetime.datetime.now().minute
++++++++if+currentHour+==+h+and+currentMinute+==+m:
++++++++++++break
++++++++#+Do+stuff...

#+Function+call.
proc(18,0)|code-block|syntax|javascript|2757367|entityMap^0|M|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You could create a function that takes hour and minutes as parameters and to perform a check inside the <code>while</code> loop:

<pre><code>import datetime

def proc(h, m):
 while True:
 currentHour = datetime.datetime.now().hour
 currentMinute = datetime.datetime.now().minute
 if currentHour == h and currentMinute == m:
 break
 # Do stuff...

# Function call.
proc(18,0)
</code></pre>

blocks|key|575085|text|使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|575086|import+datetime
#create+the+alarm+clock.
alarm+=+datetime.time(15,+8,+24)+#Hour,+minute+and+second+you+want.|code-block|syntax|javascript|575087|同时：|575088|while+alarm+<+datetime.datetime.now().time():
++++do+something|575089|您也可以设置一个特定的日期，设置如下：|575090|datetime.datetime(2019,+3,+21,+22,+0,+0)++#Year,+month,+day,+hour,+minute+and+second+you+want.|575091|有关更多信息，请查看日期时间文档。|offset|length|575092|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.python.org/3/library/datetime.html^0|0|0|0|0|0|0|A|4|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|16|8|@]|9|@$Q|17|R|18|1|19]]|A|$]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

Use:

<pre><code>import datetime
#create the alarm clock.
alarm = datetime.time(15, 8, 24) #Hour, minute and second you want.
</code></pre>

On while:

<pre><code>while alarm &lt; datetime.datetime.now().time():
 do something
</code></pre>

You could set a specific date too, setting like this:

<pre><code>datetime.datetime(2019, 3, 21, 22, 0, 0) #Year, month, day, hour, minute and second you want.
</code></pre>

For more info, check the documentation of <a href="https://docs.python.org/3/library/datetime.html" rel="nofollow noreferrer">datetime</a>.

blocks|key|1206978|text|您可以创建一个子进程，该进程将在特定时间终止父进程及其自身：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1206979|import+multiprocessing+as+mp
import+time
import+datetime
import+sys
import+signal
import+os

def+process(hr,+minute):
++++while+True:
++++++++d+=+datetime.datetime.now()
++++++++if+d.hour+==+hr+and+d.minute+==+minute:
++++++++++++os.kill(os.getppid(),+signal.SIGTERM)
++++++++++++sys.exit()
++++++++else:
++++++++++++time.sleep(25)


p+=+mp.Process(target=process,+args=(18,+0))
p.start()

#+your+program+here+...|code-block|syntax|javascript|1206980|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|$]]

You can create a child process that will terminate parent process and itself at certain time:

<pre><code>import multiprocessing as mp
import time
import datetime
import sys
import signal
import os

def process(hr, minute):
 while True:
 d = datetime.datetime.now()
 if d.hour == hr and d.minute == minute:
 os.kill(os.getppid(), signal.SIGTERM)
 sys.exit()
 else:
 time.sleep(25)


p = mp.Process(target=process, args=(18, 0))
p.start()

# your program here ...
</code></pre>

blocks|key|575125|text|让我们假设您希望代码每天运行10分钟(22:oo)。如果您使用的是Linux，您可以这样做，以root用户的身份运行作业。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|575126|sudo+crontab+-e+
0+22+*+*+*++/path/to/directory/python+my_code.py|code-block|syntax|javascript|575127|您的python文件my_code.py可能是这样的。|offset|length|style|CODE|575128|#+python+code+to+search+pattern+in+a+string+using+regex
import+re

str1+=+'this+is+{new}+string+with+[special]+words.'

r+=+re.search(r'\{(.*?)\}',+str1)
if+r:
++++found+=r.group()
else:
++++"No+match+found"

print+found|575129|entityMap^0|0|0|A|A|0|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]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Let us assume you want you code to run 10 pm(22:oo) hour every day.
If you are using Linux, you can do something like this to run job as root user

<pre><code>sudo crontab -e 
0 22 * * * /path/to/directory/python my_code.py
</code></pre>

your python file <code>my_code.py</code> could be something like that

<pre><code># python code to search pattern in a string using regex
import re

str1 = 'this is {new} string with [special] words.'

r = re.search(r'\{(.*?)\}', str1)
if r:
 found =r.group()
else:
 "No match found"

print found
</code></pre>

I want to run my program in jupyter notebook and this program stops at specific time(for example 18:00). I wrote program by while loop and incremental index, but it's better to write it with time parameter.

I run mentioned program for 7 hours each day. It must run nonstop. 

<pre><code> while(i&lt;500000):
 execute algorithm
 i+=1
</code></pre>

But I'd like to run my program like bellow:

<pre><code> while(not 18:00 clock):
 execute algorithm
</code></pre>

Run Python Program Until Specific Time

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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我想在jupyter笔记本上运行我的程序，这个程序在特定的时间停止(例如18:00)。我用时间循环和增量索引编写了程序，但最好用时间参数来编写。我每天运行上述程序7个小时。它必须不间断地运行。 while(i<500000): execute algorithm i+=1但我想像这...

问运行Python程序直到特定时间
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