python commands模块在python3.x被subprocess取代
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subprocess
可以执行shell命令的相关模块和函数有:
os.system
os.spawn
os.popen --废弃
popen2.* --废弃
commands.* --废弃,3.x中被移除
import commandsresult = commands.getoutput('cmd') #
只返回执行的结果, 忽略返回值.result = commands.getstatus('cmd')
#
返回ls -ld file执行的结果.result = commands.getstatusoutput('cmd')
#
用os.popen()执行命令cmd, 然后返回两个元素的元组(status, result). cmd执行的方式是{ cmd ; }2>&1, 这样返回结果里面就会包含标准输出和标准错误.例子
>>> subprocess.getstatusoutput('pwd')
(0, '/home/ronny')
>>> subprocess.getoutput('pwd')
'/home/ronny'
>>> subprocess.getstatus('pwd')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: module 'subprocess' has no attribute 'getstatus'
以上执行shell命令的相关的模块和函数的功能均在 subprocess 模块中实现,并提供了更丰富的功能。
(1) call
执行命令,返回状态码(命令正常执行返回0,报错则返回1)
ret1=subprocess.call("ifconfig")ret2=subprocess.call("ipconfig") #python3.5不是这样,依然会抛出异常导致无法对ret2赋值print(ret1) #0print(ret2) #1ret = subprocess.call(["ls", "-l"], shell=False) #shell为False的时候命令必须分开写ret = subprocess.call("ls -l", shell=True)
(2) check_call
执行命令,如果执行成功则返回状态码0,否则抛异常
subprocess.check_call(["ls", "-l"])subprocess.check_call("exit 1", shell=True)
(3) check_output
执行命令,如果执行成功则返回执行结果,否则抛异常
subprocess.check_output(["echo", "Hello World!"])subprocess.check_output("exit 1", shell=True)
(4) subprocess.Popen(...)
用于执行复杂的系统命令
import subprocessret1 = subprocess.Popen(["mkdir","t1"])ret2 = subprocess.Popen("mkdir t2", shell=True)
终端输入的命令分为两种:
- 输入即可得到输出,如:ifconfig
- 输入进行某环境,依赖再输入,如:python
import subprocessobj = subprocess.Popen("mkdir t3", shell=True, cwd='/home/dev',) #在cwd目录下执行命令
import subprocessobj = subprocess.Popen(["python"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)obj.stdin.write("print(1)\n")obj.stdin.write("print(2)")obj.stdin.close()cmd_out = obj.stdout.read()obj.stdout.close()cmd_error = obj.stderr.read()obj.stderr.close()print(cmd_out)print(cmd_error)
import subprocessobj = subprocess.Popen(["python"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)obj.stdin.write("print(1)\n")obj.stdin.write("print(2)")out_error_list = obj.communicate()print(out_error_list)
import subprocessobj = subprocess.Popen(["python"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)out_error_list = obj.communicate('print("hello")')print(out_error_list)
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