本篇文章介绍了Python判断程序进程是否存在的方法，希望对学习Python的朋友有帮助！
Python如何判断程序是否运行
1、进程名
import psutil
def judgeprocess(processname):
pl = psutil.pids()
for pid in pl:
if psutil.Process(pid).name() == processname:
print(pid)
break
else:
print("not found")
if judgeprocess('notepad++.exe') == 0:
print('success')
else:
pass
2、进程ID
import errno
import os
import sys
def pid_exists(pid):
"""Check whether pid exists in the current process table.
UNIX only.
"""
if pid < 0:
return False
if pid == 0:
# According to "man 2 kill" PID 0 refers to every process
# in the process group of the calling process.
# On certain systems 0 is a valid PID but we have no way
# to know that in a portable fashion.
raise ValueError('invalid PID 0')
try:
os.kill(pid, 0)
except OSError as err:
if err.errno == errno.ESRCH:
# ESRCH == No such process
return False
elif err.errno == errno.EPERM:
# EPERM clearly means there's a process to deny access to
return True
else:
# According to "man 2 kill" possible error values are
# (EINVAL, EPERM, ESRCH)
raise
else:
return True
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