有時候需要獲取進程的pid,但又無法使用第三方庫的時候.

方法適用linux平臺.

方法1

使用subprocess 的check_output函數執行pidof命令

from subprocess import check_output
def get_pid(name):
    return map(int,check_output(["pidof",name]).split())

In [21]: get_pid("chrome")
Out[21]: 
[27698, 27678, 27665, 27649, 27540, 27530,]

方法2

使用pgrep命令,pgrep獲取的結果與pidof獲得的結果稍有不同.pgrep的進程id稍多幾個.pgrep命令可以使適用subprocess的check_out函數執行

import subprocess
def get_process_id(name):
    """Return process ids found by (partial) name or regex.

    >>> get_process_id(‘kthreadd‘)
    [2]
    >>> get_process_id(‘watchdog‘)
    [10, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61]  # ymmv
    >>> get_process_id(‘non-existent process‘)
    []
    """
    child = subprocess.Popen([‘pgrep‘, ‘-f‘, name], stdout=subprocess.PIPE, shell=False)
    response = child.communicate()[0]
    return [int(pid) for pid in response.split()]

方法3

直接讀取/proc目錄下的文件.這個方法不需要啟動一個shell,只需要讀取/proc目錄下的文件即可獲取到進程信息.

#!/usr/bin/env python

import os
import sys


for dirname in os.listdir(‘/proc‘):
    if dirname == ‘curproc‘:
        continue

    try:
        with open(‘/proc/{}/cmdline‘.format(dirname), mode=‘rb‘) as fd:
            content = fd.read().decode().split(‘\x00‘)
    except Exception:
        continue

    for i in sys.argv[1:]:
        if i in content[0]:
            print(‘{0:<12} : {1}‘.format(dirname, ‘ ‘.join(content)))

phoemur ~/python $ ./pgrep.py bash
1487         : -bash 
1779         : /bin/bash

4,獲取當前腳本的pid進程

import os

os.getpid()

python 使用標準庫根據進程名獲取進程的pid