Python3 subprocess can't run command "la" or "ll" - python-3.x

Question

completeProcess = subprocess.run("la")
This is my code to run commands via python, and it raise this error:
Traceback (most recent call last):
File "script_senior.py", line 171, in <module>
completeProcess = subprocess.run("la") # doesn't capture output
File "/usr/lib/python3.5/subprocess.py", line 693, in run
with Popen(*popenargs, **kwargs) as process:
File "/usr/lib/python3.5/subprocess.py", line 947, in __init__
restore_signals, start_new_session)
File "/usr/lib/python3.5/subprocess.py", line 1551, in _execute_child
raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'la'
My OS is ubuntu, and when enter "la" in terminal, it will list files(include hidden files) in current working directory. and "ll" cmd will list file details. but I can't use them in python's subprocess api
How can I achieve this function? Is there any common api to run commands or just the python didn't recognize "la"

Answer 1

la is an alias for 'ls -A'. That comes as a default shell alias in systems like Ubuntu. If you wanna run it just use:
completeProcess = subprocess.run(["ls","-A"])
and if you are looking for the stdout you can use something like:
completeProcess = subprocess.run(["ls","-A"] , stdout=subprocess.PIPE)
print(completeProcess.stdout.decode())