How to invoke external commands in Python script
This article mainly introduces the Python script how to call external commands, the article is very detailed, has a certain reference value, interested friends must read it!
1. Os.system passes commands and parameters to the shell of the system.
This is good, because you can actually run multiple commands and set up pipe and input / output redirection in this way. For example:
Os.system ("some_command"
< input_file | another_command >Output_file ")
2. In addition to providing file-like objects, os.system can use it to access the standard input / output of the process.
Stream = os.popen ("some_command with args") will do the same thing
3. Popen class subprocess of the module.
This is intended to replace os.popen but has the disadvantage of being a little more complex because it is so comprehensive.
Print subprocess.Popen ("echo Hello World", shell=True, stdout=subprocess.PIPE). Stdout.read () above is all the content of the article "how Python scripts call external commands". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!
