unix - Calling multiple commands using os.system in Python

Question

I would like to invoke multiple commands from my python script. I tried using the os.system(), however, I'm running into issues when the current directory is changed.

example:

os.system("ls -l")
os.system("<some command>") # This will change the present working directory 
os.system("launchMyApp") # Some application invocation I need to do.

Now, the third call to launch doesn't work.

Answer 1

os.system is a wrapper for Standard C function system(), and thus its argument can be any valid shell command as long as it fits into the memory reserved for environment and argument lists of a process.

So, separate those commands with semicolons or line breaks, and they will be executed sequentially in the same environment.

os.system(" ls -l; <some command>; launchMyApp")

os.system('''
ls -l
<some command>
launchMyApp
''')