Instalation of library for Python 3 / 3.7

[ybeco]

Hi

I don't understand how to install a library available for all Python3 versions...

I installed "numpy" in this way:

Output:
sudo apt-get install python-numpy python-scipy python-matplotlib ipython ipython-notebook python-pandas python-sympy python-nose

It's not working with Python 3.7.3 (Used by the default Python IDLE!!!):

Output:
yonnel@yonnel-Z97X-Gaming-7:~$ python3.7
Python 3.7.3 (default, Apr  3 2019, 19:16:38) 
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'numpy'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
  File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
    import apport.fileutils
  File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
    from apport.packaging_impl import impl as packaging
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
    import apt
  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'

Original exception was:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'numpy'
>>> exit()

But it is working with Python 3.6.8:

Output:
yonnel@yonnel-Z97X-Gaming-7:~$ python3
Python 3.6.8 (default, Jan 14 2019, 11:02:34) 
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> exit()

Python 3.7 is a Python3, isn't it?

Then I did:

Output:
python3 -m pip install --user numpy

And it's working now:

Output:
yonnel@yonnel-Z97X-Gaming-7:~$ python3.7
Python 3.7.3 (default, Apr  3 2019, 19:16:38) 
[GCC 8.0.1 20180414 (experimental) [trunk revision 259383]] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> exit()
yonnel@yonnel-Z97X-Gaming-7:~$

It's not make sens for me...
-> Is that's meen that for Python 3.7.4 ot Python 3.8.x I will have to re-install all my libraries?
-> apt-get is not installing libraries for the default version of python IDLE?
-> Default version of Python in command line and in the oficial IDLE are not the same and it's cause problem...

What is the right libraries's management policy?

Thank you

[Larz60+]

pip is good if package from pypi,
otherwise you can use apt-get,
or if a wheel with pip as well