When should I use the Python shebang line #!/usr/bin/env python3 ?

Question

In the most Python files which I see here on sololearn there is no shebang line

#!/usr/bin/python

used.

I am curious in which use cases I need this. Is this only needed on certain operation systems? the sequence "#!/usr/bin/env python3" seems to be a linux specific path.

When I code on Linux, then I run my codes directly from IDLE and they run without problems without the shebang.

Please enlighten me.

Answer 1

You can use the shebang to make your script directly executable from linux command line. So it will be similar to any bash command.

https://stackoverflow.com/questions/6908143/should-i-put-shebang-in-JUMP_LINK__&&__python__&&__JUMP_LINK-scripts-and-what-form-should-it-take

Answer 2

I use it if, for whatever reason, I coded in python 2.7 instead of 3.x.

the shebang above really doesnt do much because it would just route the code to run through the default python version of the system. it doesnt specify wich version it uses. they most likely copied from a computer

basically you can route your code through your python version of choice