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Python Discussion Thread
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Jan 17th, 2007

PATH not known in Windows?

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Hello,

I am new to Python and find it really nice.
But I can not launch an executable file using only its name. I have to give its whole path. I expected that the PATH environment variable is known by Python and that it could retrieve the full path itself...
I use Windows XP, Python 2.5 and os.spawnl to launch the executable file.
Thanks in advance for your help!

dams

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dams

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Newbie Poster

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since Jan 2007

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Jan 17th, 2007

Re: PATH not known in Windows?

Write a small Python program like the one below and save it as PrintHello.py ...

Python Syntax (Toggle Plain Text)
print "Hello"
 
raw_input("Press Enter to go on ... ")
print "Hello"
 
raw_input("Press Enter to go on ... ")

Now run this program ...

Python Syntax (Toggle Plain Text)
import subprocess
 
subprocess.call(["Python.exe", "PrintHello.py"])
import subprocess
 
subprocess.call(["Python.exe", "PrintHello.py"])

It seems to find Python.exe without any problems.

vegaseat

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DaniWeb's Hypocrite

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Jan 17th, 2007

Re: PATH not known in Windows?

This will print your PYTHONPATH. If the path you want is not listed, and it shouldn't be because your program isn't found, then you have to use sys.path.append to add it.

Python Syntax (Toggle Plain Text)
import sys
path_list= sys.path
for eachPath in path_list :
   print eachPath
import sys
path_list= sys.path
for eachPath in path_list :
   print eachPath

woooee

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Nearly a Posting Maven

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Jan 18th, 2007

Re: PATH not known in Windows?

Click to Expand / Collapse Quote originally posted by woooee ...

This will print your PYTHONPATH. If the path you want is not listed, and it shouldn't be because your program isn't found, then you have to use sys.path.append to add it.
Python Syntax (Toggle Plain Text)
import sys
path_list= sys.path
for eachPath in path_list :
   print eachPath
import sys path_list= sys.path for eachPath in path_list : print eachPath

PYTHONPATH is only used by Python internally to find modules etc.
This person wants to use Window's Environment Variable.

bumsfeld

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Nearly a Posting Virtuoso

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Jan 18th, 2007

Re: PATH not known in Windows?

Thanks to you all for your quick answer!
The method with subprocess.call is exactly what I want and runs perfectly.
Bye,
Dams

dams

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