我如何循环一个 python 文件以无限期地打开另一个 python 文件？

Question

So I know how to execute a Python file within another Python file, exec(open('file.py').read()) But the file that I want to loop has a while(True): loop within the file. What I want to do is loop the opening of the file containing the while true loop, while having that file run in the background.

The Opening Code:

loopCount=1
maxCount=100
while(loopcount<=maxCount):
     exec(open('whileTrue.py').read())

I would think that you would do something like this, but instead of opening the file, allowing the file to run in the background, and opening the file again, etc; the code opens the file once then has the file run without opening the next file until after the file has been closed.

Any help with this is greatly appreciated.

Answer 1

Firstly, the exec(...) command is unsafe and really should be avoided. An alternative method would be to import your other Python file as if it were a module.

To be able to run the second file multiple times in parallel, you could use the threading module built into Python.

Say we have two files, FileA.py and FileB.py .

FileA.py :

import threading, FileB
for i in range(5):
    currentThread = threading.Thread(target=FileB.Begin)
    currentThread.start()

FileB.py :

import time
def Begin():
    for i in range(10):
        print("Currently on the {} second...".format(i))
        time.sleep(1)

FileA.py will start 5 different threads, each running the Begin() function from FileB.py . You may replace the contents of the Begin() function, rename it or do whatever you like, but be sure to update the threads target in FileA.py .

It should be noted that opening too many threads is a bad idea as you may exceed the amount of memory your computer has. As well as that, you should ensure that your threads eventually end and are not a true 'infinite loop', as you may find you have to force your version of FileA.py to close in order to end the threads.

For more detail on the threading module you can see the python documentation: https://docs.python.org/3/library/threading.html

Or you could fine many guides related to the topic by searching for Python threading on Google.

I hope this helps.