When you execute a script without typing "python" in front, you need to know two things about how Windows invokes the program. First is to find out what kind of file Windows thinks it is:

    C:\>assoc .py
    .py=Python.File

Next, you need to know how Windows is executing things with that extension. It's associated with the file type "Python.File", so this command shows what it will be doing:

    C:\>ftype Python.File
    Python.File="c:\python26\python.exe" "%1" %*

So on my machine, when I type "blah.py foo", it will execute this exact command, with no difference in results than if I had typed the full thing myself:

    "c:\python26\python.exe" "blah.py" foo

If you type the same thing, including the quotation marks, then you'll get results identical to when you just type "blah.py foo". Now you're in a position to figure out the rest of your problem for yourself.

(Or post more helpful information in your question, like actual cut-and-paste copies of what you see in the console. Note that people who do that type of thing get their questions voted up, and they get reputation points, and more people are likely to help them with good answers.)

Brought In From Comments:

Even if assoc and ftype display the correct information, it may happen that the arguments are stripped off. What may help in that case is directly fixing the relevant registry keys for Python. Set the

HKEY_CLASSES_ROOT\Applications\python26.exe\shell\open\command

key to:

"C:\Python26\python26.exe" "%1" %*

Likely, previously, %* was missing. Similarly, set

 HKEY_CLASSES_ROOT\py_auto_file\shell\open\command

to the same value. See http://eli.thegreenplace.net/2010/12/14/problem-passing-arguments-to-python-scripts-on-windows/

HKEY_CLASSES_ROOT\Applications\python.exe\shell\open\command The registry path may vary, use python26.exe or python.exe or whichever is already in the registry.

HKEY_CLASSES_ROOT\py_auto_file\shell\open\command

you should make the default application to handle python files be python.exe.

right click a *.py file, select "Open With" dialog. In there select "python.exe" and check "always use this program for this file type" (something like that).

then your python files will always be run using python.exe

I encountered the same problem but in the context of needing to package my code for Windows users (coming from Linux). My package contains a number of scripts with command line options.

I need these scripts to get installed in the appropriate location on Windows users' machines so that they can invoke them from the command line. As the package is supposedly user-friendly, asking my users to change their registry to run these scripts would be impossible.

I came across a solution that the folks at Continuum use for Python scripts that come with their Anaconda package -- check out your Anaconda/Scripts directory for examples.

For a Python script test, create two files: a test.bat and a test-script.py.

test.bat looks as follows (the .bat files in Anaconda\Scripts call python.exe with a relative path which I adapted for my purposes):

@echo off
set PYFILE=%~f0
set PYFILE=%PYFILE:~0,-4%-script.py
"python.exe" "%PYFILE%" %*

test-script.py is your actual Python script:

import sys
print sys.argv

If you leave these two files in your local directory you can invoke your Python script through the .bat file by doing

test.bat hello world
['C:\\...\\test-scripy.py', 'hello', 'world']

If you copy both files to a location that is on your PATH (such as Anaconda\Scripts) then you can even invoke your script by leaving out the .bat suffix

test hello world
['C:\\...Anaconda\\Scripts\\test-scripy.py', 'hello', 'world']

Disclaimer: I have no idea what's going on and how this works and so would appreciate any explanation.

Can you execute python.exe from any map? If you do not, chek if you have proper values for python.exe in PATH enviroment

Are you in same directory than blah.py. Check this by issuing command -> edit blah.py and check if you can open this file

EDIT:

In that case you can not. (python arg means that you call python.exe whit some parameters which python assume that is filename of script you want to run)

You can create bat file whit lines in your path map and run .bat file

Example:
In one of Path maps create blah.py.bat Edit file and put line

python C:\Somedir\blah.py

You can now run blah.py from anywere, becuase you do not need to put .bat extention when running bat files

Simply run the command:

C:>python .\file_name.py

Assuming the file name is within same folder and Python has already been added to environment variables.