when will Python3 be THE Python?

[Skaperen]

i went ahead and changed my "py" symlink to Python version 3. i only use it to start an interactive Python.

Output:
lt2a/phil /home/phil 17> py3
Python 3.6.9 (default, Apr 18 2020, 01:56:04) 
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
lt2a/phil /home/phil 18> py2
Python 2.7.17 (default, Apr 15 2020, 17:20:14) 
[GCC 7.5.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 
lt2a/phil /home/phil 19> py
Python 3.6.9 (default, Apr 18 2020, 01:56:04) 
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
lt2a/phil /home/phil 20> 

[pyzyx3qwerty]

However, in my Mac, whenever I type python on the terminal , it always comes as python 2 - i have to type python 3 for the 3.7.3 version to come - that must mean that python 3 isn't the official python yet
However it won't be long before this happens

[snippsat]

I will still use pyenv on newer distros for it's flexibility that is unmatched bye whatever can mix together or mess up yourself
Back to old days Python 2.4.

tom@tom:~$ python -V
Python 3.8.3

# Time travel
tom@tom:~$ pyenv global 2.4
tom@tom:~$ python -V
Python 2.4
tom@tom:~$ pip --version
pip 1.1 from /home/tom/.pyenv/versions/2.4/lib/python2.4/site-packages/pip-1.1-py2.4.egg (python 2.4)

# To old going back again
tom@tom:~$ pyenv global 3.8.3
tom@tom:~$ python -V
Python 3.8.3
tom@tom:~$ pip --version
pip 19.2.3 from /home/tom/.pyenv/versions/3.8.3/lib/python3.8/site-packages/pip (python 3.8)

A other strength of pyenv if want to use/test other version say Anaconda or PyPy.
PyPy is an impressive project that has been worked on since 2007.
Some code.

def fibonacci(n):
    if n == 1 or n == 0:
        return 1
    else:
        return fibonacci(n-1) + fibonacci(n-2)

print(fibonacci(38))

So 23,3-sec with python 3.8.3.

tom@tom:~$ python -V
Python 3.8.3
tom@tom:~$ time python fib.py
63245986

real	0m23,352s
user	0m23,316s
sys	0m0,009s

Install newest PyPy with pyenv and test.
So from 23,3-sec to 1,3-sec with PyPy.

tom@tom:~$ pyenv install pypy3.6-7.3.1
Downloading pypy3.6-v7.3.1-linux64.tar.bz2...
-> https://bitbucket.org/pypy/pypy/downloads/pypy3.6-v7.3.1-linux64.tar.bz2
Installing pypy3.6-v7.3.1-linux64...
Installed pypy3.6-v7.3.1-linux64 to /home/tom/.pyenv/versions/pypy3.6-7.3.1

tom@tom:~$ pyenv global pypy3.6-7.3.1
tom@tom:~$ python -V
Python 3.6.9 (2ad108f17bdb, Apr 07 2020, 02:59:05)
[PyPy 7.3.1 with GCC 7.3.1 20180303 (Red Hat 7.3.1-5)]

tom@tom:~$ time python fib.py
63245986

real	0m1,341s
user	0m1,263s
sys	0m0,045s

[Skaperen]

which python do you get if you create a fresh new user, login to that fresh new user, never run pyenv, and run python -V?

python and py get python3 only because i have set it that way in /usr/host/bin which is also added to the PATH variable ahead of even /usr/local/bin. i don't know if you can safely do that on a Mac.

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you have your tabs set to 4? i hope you are not putting tabs in your .py files.