After patching subprocess Popen dosen't work about gevent HOT 1 CLOSED

You're patching in the wrong order. Do this:

from gevent import monkey; monkey.patch_all()
from subprocess import Popen
Popen(['echo', 'ok'])

(I'm using patch_all() because that's the recommended way to patch; patching only some modules is advanced usage and isn't guaranteed to work because of interactions between modules.)

gevent's patching replaces the entire subprocess.Popen object, but if you've already imported it by name, you have your own private reference to the old stdlib Popen object, which cannot work.

This also works (it should be clear from the above why it works), but this is not recommended --- you should instead patch as early as possible.

from gevent import monkey
import subprocess
monkey.patch_all()

subprocess.Popen(['echo', 'ok'])

from gevent.