set default python version when run the program as executable ./xxx.py - on linux -


i run python directly executable file ./xxx.py

however, when run this, automatically use python 2.7 instead of python 3.

how use python 3 run executable python file?

in case: 

./magane.py shell

it give me 

python 2.7.9 (default, apr  2 2015, 15:33:21)  [gcc 4.9.2] on linux2 type "help", "copyright", "credits" or "license" more information. (interactiveconsole) >>>

but have this: 

python3 manage.py shell /home/cliu/.local/lib/python3.4/site-packages/django/db/backends/sqlite3/base.py:57: runtimewarning: sqlite received naive datetime (2015-05-31 15:24:46.785297) while time zone support active.   runtimewarning)  python 3.4.3 (default, mar 26 2015, 22:03:40)  type "copyright", "credits" or "license" more information.  ipython 2.3.0 -- enhanced interactive python. ?         -> introduction , overview of ipython's features. %quickref -> quick reference.      -> python's own system. object?   -> details 'object', use 'object??' details.  in [1]:

where python3 uses ipython.

to tell python version use , make executable on linux have following steps:

add #! python script

#!/usr/bin/env python3

add permissions run it

chmod +x xxx.py

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