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Working on some code and I'm given the error when running it from the command prompt...
NameError: name 'Popen' is not defined
but I've imported both import os and import sys.
Here's part of the code
exepath = os.path.join(EXE File location is here)
exepath = '"' + os.path.normpath(exepath) + '"'
cmd = [exepath, '-el', str(el), '-n', str(z)]
print 'The python program is running this command:'
print cmd
process = Popen(cmd, stderr=STDOUT, stdout=PIPE)
outputstring = process.communicate()[0]
Am I missing something elementary? I wouldn't doubt it. Thanks!
925
Python method popen() opens a pipe to or from command. The return value is an open file object connected to the pipe, which can be read or written depending on whether mode is 'r' (default) or 'w'. The bufsize argument has the same meaning as in open() function.
Popen is nonblocking. call and check_call are blocking. You can make the Popen instance block by calling its wait or communicate method.
The subprocess module defines one class, Popen and a few wrapper functions that use that class. The constructor for Popen takes arguments to set up the new process so the parent can communicate with it via pipes. It provides all of the functionality of the other modules and functions it replaces, and more.
The subprocess module present in Python(both 2. x and 3. x) is used to run new applications or programs through Python code by creating new processes.
you should do:
import subprocess
subprocess.Popen(cmd, stderr=subprocess.STDOUT, stdout=subprocess.PIPE)
# etc.
Popen is defined in the subprocess module
import subprocess
...
subprocess.Popen(...)
Or:
from subprocess import Popen
Popen(...)
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