How to execute Python scripts in Windows?

Question

I have a simple script blah.py (using Python 2):

import sys
print sys.argv[1]

If I execute my script by:

python c:/..../blah.py argument

It prints argument but if I execute script by:

blah.py argument

error occurs:

IndexError...

So arguments do not pass to script.

python.exe in PATH. Folder with blah.py also in PATH.
python.exe is default program to execute *.py files.

What is the problem?

Answer 1

If that's what I understood, it's like this:

C:\Users\(username)\AppData\Local\Programs\Python\Python(version)

COPY (not delete) python.exe and rename to py.exe and execute:

py filename.py

Answer 2

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

Answer 3

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

Answer 4

How to execute Python scripts in Windows?

You could install pylauncher. It is used to launch .py, .pyw, .pyc, .pyo files and supports multiple Python installations:

T\:> blah.py argument

You can run your Python script without specifying .py extension if you have .py, .pyw in PATHEXT environment variable:

T:\> blah argument

It adds support for shebang (#! header line) to select desired Python version on Windows if you have multiple versions installed. You could use *nix-compatible syntax #! /usr/bin/env python.

You can specify version explicitly e.g., to run using the latest installed Python 3 version:

T:\> py -3 blah.py argument

It should also fix your sys.argv issue as a side-effect.