Several Methods for python to execute shell commands

Several Methods for python to execute shell commands

1. OS. system ()

Advantages: it is simple and can be used on linux and widnows platforms. You only need to determine whether the returned result is 0 or 1 to determine whether the execution is successful.

Disadvantage: The returned output cannot be obtained.

Example:

 

os.system('ls')

 

2. OS. popen ()

Advantage: output results can be obtained.

Disadvantage: The execution result cannot be obtained. It must be determined and processed based on the output result.

Example:

 

output = os.popen('ls')print output.read()

 

3. commands. getstatusoutput ()

Advantage: the execution results and returned results can be obtained at the same time.

Disadvantage: windows platform does not support

Example:

 

status, output = commands.getstatusoutput('dir')print status, output

 

 

4. subprocess. Popen ()

Advantage: the execution result and returned result can be obtained at the same time, and the linux and windows platforms are supported.

Example:

 

p = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)msg = ''for line in p.stdout.readlines():    msg += linestatus = p.wait()output = msg