fabfile.py

from fabric.api import *
import subprocess

def demo():
	cmd = r'dir "sub directory with spaces"'
	print('Command: {}'.format(cmd))
	mylocal(cmd, capture=False)

def mylocal(command, capture):
    real_command = command
    # By default, capture both stdout and stderr
    PIPE = subprocess.PIPE
    out_stream = PIPE
    err_stream = PIPE
    # Tie in to global output controls as best we can; our capture argument
    # takes precedence over the output settings.
    if not capture:
        if output.stdout:
            out_stream = None
        if output.stderr:
            err_stream = None
    p = subprocess.Popen(real_command, shell=True, stdout=out_stream,
            stderr=err_stream)
    (stdout, stderr) = p.communicate()
    # Handle error condition (deal with stdout being None, too)
    class _AttributeString(str): pass
    out = _AttributeString(stdout.strip() if stdout else "")
    err = _AttributeString(stderr.strip() if stderr else "")
    out.failed = False
    out.stderr = err
    out.return_code = p.returncode
    if p.returncode != 0:
        out.failed = True
        msg = "local() encountered an error (return code %s) while executing '%s'" % (p.returncode, command)
        _handle_failure(message=msg)
    out.succeeded = not out.failed
    # If we were capturing, this will be a string; otherwise it will be None.
    return out