Traditionally those shebang lines have been ignored on Windows, but Python versions 3.3 and up will parse this line on Windows as well. So, for example, if you want to select the Python version to run per file, you can use the Unix-style “shebang” comments like these: This raft of options is nice, I suppose, but it can be confusing. You can also specify versions in either partial or full form in both of those contexts. The new launcher mechanism means you can now select versions explicitly on either a per-file or per-command basis. Now let’s see how you actually make all that happen. Accept Unix-style #! comment lines at the top of scripts to determine the Python version to use.Accept Python version numbers to be passed in as command-line arguments.Do not require a directory path or PATH settings when used at the command line. Open Python source and byte-code files launched by icon clicks or filename commands.The main thing is just to pay attention to it and make sure the setting is disabled.īut how does all this work? First, understand that these new py.exe and pyw.exe files: Note: It’s possible the next iteration of the 2.7.x launcher will remove the fact that Register Extensions are installed by default. Note that these py.exe and pyw.exe files are different from the normal python.exe executable that each package you installed will have placed in c:\Python34 and c:\Python27, respectively. Doing that would have overridden the launcher being the default. This is specifically why I had you remove the option to Register Extensions for the 2.7 install. That last part is important: the installation will have registered them as the applications to execute when Python is executed. Installing the 3.4.1 package will have put py.eye and pyw.exe launchers into %SYSTEMROOT% (on the Windows system PATH) and then associate those with. Specifically, remove the “Register Extensions” option from installing.
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