How to execute Python scripts in Windows?
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.
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
Additionally, if you want to be able to run your python scripts without typing the .py
(or .pyw
) on the end of the file name, you need to add .PY
(or .PY;.PYW
) to the list of extensions in the PATHEXT environment variable.
In Windows 7:
right-click on Computer
left-click Properties
left-click Advanced system settings
left-click the Advanced tab
left-click Environment Variables...
under "system variables" scroll down until you see PATHEXT
left-click on PATHEXT to highlight it
left-click Edit...
Edit "Variable value" so that it contains ;.PY
(the End key will skip to the end)
left-click OK
left-click OK
left-click OK
Note #1: command-prompt windows won't see the change w/o being closed and reopened.
Note #2: the difference between the .py
and .pyw
extensions is that the former opens a command prompt when run, and the latter doesn't.
On my computer, I added ;.PY;.PYW
as the last (lowest-priority) extensions, so the "before" and "after" values of PATHEXT were:
before: .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
after .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.PY;.PYW
Here are some instructive commands:
C:\>echo %pathext%.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.PY;.PYWC:\>assoc .py.py=Python.FileC:\>ftype Python.FilePython.File="C:\Python32\python.exe" "%1" %*C:\>assoc .pyw.pyw=Python.NoConFileC:\>ftype Python.NoConFilePython.NoConFile="C:\Python32\pythonw.exe" "%1" %*C:\>type c:\windows\helloworld.pyprint("Hello, world!") # always use a comma for direct addressC:\>helloworldHello, world!C:\>