Python cmd command call and pythoncmd command

Python cmd command call and pythoncmd command

For python, call the cmd command:

Two methods are introduced:

1. python OS module.

The OS module calls the CMD command in two ways: OS. popen () and OS. system (). Both use the current process to call the command.

OS. system cannot obtain the returned value. After the execution is complete, execute the program below. For example, OS. system ("ipconfig ").

OS. popen contains the returned value and how to obtain the returned value. For example

P = OS. popen (cmd)

Print p. read (). The result is a string.

Both are called using the current process, that is, they are all blocking.

2. Pipeline subprocess module.

The operating principle will generate sub-processes under the current process.

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

Sub. wait ()

Print sub. read ()