Using the github webhooks, I would like to be able to pull any changes to a remote development server. At the moment, when in the appropriate directory, `git pull` gets any changes that need to be made. However, I can't figure out how to call that function from within Python. I have tried the following:

```python
import subprocess
process = subprocess.Popen("git pull", stdout=subprocess.PIPE)
output = process.communicate()[0]

```

But this results in the following error

```
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

```

Is there a way that I can call this bash command from within Python?