You may want to use `#!/usr/bin/env python3` instead. There is a concept in python called the virtual environment. This used to be done with a tool called virtualenv in python2, and is now done mainly through a venv module in python3.
A virtual environment goes into a directory of your choosing and will have its own python3 executable, and pip3 executable, and when you add dependencies, they are also placed into the directory structure under your chosen directory. When you do a `. <directory>/bin/activate` the included source will places the virtual environment's bin/ folder at the beginning of your PATH environment variable, making it the default python3 when you type it without a full path. This allows you to run scripts that need different, or even conflicting, sets of dependencies without bothering with the underlying linux distribution's python installation's modules. If you use `#!/usr/bin/python3`, it will always use exactly the system version that is installed, and the system's installed modules. Your scripts will still default to the system installation if a virtual environment is not activated. So you lose nothing by doing it this way, but gain a little control from it. On Sat, Jul 20, 2019 at 1:41 PM Manfred Lotz <ml_n...@posteo.de> wrote: > Hi there, > Pretty new to python I've got a question regarding the proper shebang > for Python 3. > > I use > #!/usr/bin/python3 > > which works fine. > > Today I saw > #!/usr/bin/python3 -tt > > and was wondering what -tt means. > > Being on Fedora 30, Python 3.7.3 the man page of python3 doesn't even > mention -t. > > python 2 man page mentions > > -t Issue a warning when a source file mixes tabs and spaces > for indentation in a way that makes it depend on the worth > of a tab expressed in spaces. Issue an error when the option is > given twice. > > I guess that -t has the same meaning with python 3.7.3. > > > My questions: > > 1. Is my guess correct? > > 2. Is it a bug that it is not mentioned? python3 --help doesn't mention > it either. > > > -- > Manfred > > > -- > https://mail.python.org/mailman/listinfo/python-list > -- https://mail.python.org/mailman/listinfo/python-list
