CODEWITHSUNDEEP
pythonpython-3.xpython-3.8
Зелди
Зелди

Reputation: 86

Error while trying to run command with subprocess

I'm trying to run console command using python library subprocess. Here's what I get:

Python 3.8.3 (tags/v3.8.3:6f8c832, May 13 2020, 22:37:02) [MSC v.1924 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> import os
>>> os.system("echo Hello, World!")
Hello, World!
0
>>> subprocess.run(["echo", "Hello, World!"])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\trolo\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 489, in run
    with Popen(*popenargs, **kwargs) as process:
  File "C:\Users\trolo\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "C:\Users\trolo\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 1307, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] The system cannot find the file specified

Upvotes: 0

Views: 4506

Answers (2)

Dustin Spicuzza
Dustin Spicuzza

Reputation: 836

FileNotFoundError indicates that the first argument in the subprocess.run list of arguments does not exist (in this case, 'echo' does not exist).

echo is a shell command (not an executable) and according to the python documentation:

Unlike some other popen functions, this implementation will never implicitly call a system shell.

To address this, add the shell=True argument:

subprocess.run(["echo", "Hello, World!"], shell=True)

EDIT: As noted in the comments, apparently non-Windows systems require all arguments to be a single string:

subprocess.run(["echo Hello, World!"], shell=True)

or

subprocess.run("echo Hello, World!", shell=True)

Upvotes: 1

tripleee
tripleee

Reputation: 189327

To run a shell command like echo, you want shell=True; and then the first argument should simply be a string, not a list of strings.

subprocess.run('echo "Hello world!"', shell=True)

Upvotes: 2

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