Python script is behaving differently when run through batch file and cmd line

Question

I have a Python script which needs to be run with a batch file, but I've been using cmd to test it. When run through cmd, it works fine. However, the script seems to behave differently when run through the batch file. I've isolated the section of code which seems to be the problem:

CRFOLDER = "some path to all my files"

isReady = False
os.startfile(os.path.join(CRFOLDER,"CLogger.exe"))

while not isReady:

    try:
        open(os.path.join(CRFOLDER,"CRPYLog.py"))
        isReady = True
    except:
        print "Not ready yet"
        time.sleep(0.25)

import CRPYLog as PyLog

This code calls an executable which creates a Python file, which I then import (if you're curious about the reason, check here). As I said, this works fine when run through cmd. However, when I use the batch file, the while loop runs infinitely (or at least for 2 minutes, when run through cmd it hits the except just once). This is weird. I checked this, this, and this question with no luck. The batch file is below.

start Y:\Admin\Anaconda\python.exe "Y:\Projects\Advent - Overhead Projects\Copy - ADV001 - CR Records Management - Copy\Python\CRWizard.py"

I've tried pasting that exact command into cmd and it worked fine, but the batch file does not. Thanks in advance

What is CRFOLDER? Is it pointing to the same location in both cases (batch file and run directly)? — BrenBarn
– BrenBarn, Commented Dec 16, 2013 at 20:24
What is CRFOLDER value for those two runs? For what reason you use startfile instead of for example subprocess.call? — alko
– alko, Commented Dec 16, 2013 at 20:24
I've updated the question, CRFOLDER is the path to where all my files live. I had it print the value of os.path.join(CRFOLDER,"clogger.exe") and os.path.join(CRFOLDER,"CRPYLog.py"), they both appeared to be correct — wnnmaw
– wnnmaw, Commented Dec 16, 2013 at 20:26
@alko, I assumed startfile was the cleanest way to open files in their default programs, but I doubt there's anything holy about it — wnnmaw
– wnnmaw, Commented Dec 16, 2013 at 20:27
can your CLogger.exe log absolute location of created file? — latheiere
– latheiere, Commented Dec 16, 2013 at 20:36

latheiere · Accepted Answer · 2013-12-16 20:46:18Z

2

Probably, your batch file is running excutable with windows native call (os.startfile), and hence sets some defaults (current folder), forcing executable to create resulting file in folder that differs from expected CRFOLDER.

I suggest you to specify excplicetely in which foder you need this .py file to be created, for example, to be a flexible solution, as a paramether to executable.

answered Dec 16, 2013 at 20:46

latheiere

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Raydel Miranda · Accepted Answer · 2013-12-16 20:54:56Z

0

You don't have to type the start command for that. See this. Just remove the start command.

Y:\Admin\Anaconda\python.exe "Y:\Projects\Advent - Overhead Projects\Copy - ADV001 - CR Records Management - Copy\Python\CRWizard.py"

answered Dec 16, 2013 at 20:54

Raydel Miranda

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