Python cmd command call

About the python call cmd command:

There are two main ways of doing this:

The 1.python OS module.

The OS module invokes the cmd command in two ways: Os.popen (), Os.system (). are invoked with the current process.

Os.system is unable to get the return value. Execute the program below when the run is finished. Usage such as: Os.system ("ipconfig").

Os.popen with the return value, how to get the return value. Such as

P=os.popen (CMD)

Print P.read (). A string is obtained.

Both are invoked with the current process, which means that they are all blocked.

2. Piping subprocess module.

The operating principle produces child processes under the current process.

Sub=subprocess. Popen (cmd,shell=true,stdout=subprocess. PIPE)

Sub.wait ()

Print Sub.read ()

Python cmd command call