The difference between Python Os.system and Os.popen

(1) Os.system

# Run System commands on only one sub-terminal and cannot get return information after command execution

System (command), Exit_status
Execute the command (a string) in a subshell.

# if the command line executes, the result is printed directly.

1 >>> os.system ('ls')2304101419778 . CHM   Bash      document    media      py-Django   video45 . wmv            Books     downloads   Pictures  python67 all-20061022       Desktop   Examples    Project    Tools

(2) Os.popen

# This method not only executes the command but also returns the executed information object

Popen (command [, mode= ' R ' [, BufSize]]), pipe
Open a pipe to/from a command returning a file object.

For example:

1>>>tmp = Os.popen ('ls *.py'). ReadLines ()2 3>>>tmp4 5 out[]:6 7['dump_db_pickle.py',8 9 'dump_db_pickle_recs.py',Ten  One 'dump_db_shelve.py', A  - 'initdata.py', -  the '__init__.py', -  - 'make_db_pickle.py', -  + 'make_db_pickle_recs.py', -  + 'make_db_shelve.py', A  at 'peopleinteract_query.py', -  - 'reader.py', -  - 'testargv.py', -  in 'teststreams.py', -  to 'update_db_pickle.py', +  - 'writer.py']

The advantage is that the returned result is assigned to a variable to facilitate the processing of the program.

The difference between Python Os.system and Os.popen