Python中如何讓幾條代碼同時執行？

代碼一般是一條一條的執行，必須等上一條執行完了後，才跳到這一行。但是能不能讓幾條代碼同時執行呢？

對於python來說並發有多線程和協程，並行有多進程，看你的需求自己選擇

可以使用pool和map的組合來進行簡單的multithreading, 如：

from multiprocessing.dummy import Pool as ThreadPool pool = ThreadPool(4) results = pool.map(my_function, my_array)

具體例子：

import urllib2 from multiprocessing.dummy import Pool as ThreadPool

urls = [
http://www.python.org,
http://www.python.org/about/,
http://www.onlamp.com/pub/a/python/2003/04/17/metaclasses.html,
http://www.python.org/doc/,
http://www.python.org/download/,
http://www.python.org/getit/,
http://www.python.org/community/,
https://wiki.python.org/moin/,
]

# Make the Pool of workers
pool = ThreadPool(4)

# Open the URLs in their own threads
# and return the results
results = pool.map(urllib2.urlopen, urls)

# Close the pool and wait for the work to finish
pool.close()
pool.join()

結果

Single thread: 14.4 seconds 4 Pool: 3.1 seconds 8 Pool: 1.4 seconds 13 Pool: 1.3 seconds

Ref: https://stackoverflow.com/questions/2846653/how-can-i-use-threading-in-python

使用一些命令工具進行並行，

簡單點使用一些命令工具進行並行就可以了，比如我介紹的 rush

王詩翔：使用 rush 進行命令並行處理?

zhuanlan.zhihu.com