Cannot use pypy on Python3 code

[snippsat]

I installed numpy for Ptyhon2 and Python3.

That make no difference,you most install to PyPy.
PyPy is an alternative implementation,so it has nothing to with OS installation of Python.

Read the my post one more time,you most get pip for PyPy then install to with:

pypy -m pip install numpy

Example with an older version on PyPy that i have.

C:\pypy5.4
λ pypy -m ensurepip
Ignoring indexes: https://pypi.python.org/simple
Collecting setuptools
Collecting pip
Installing collected packages: setuptools, pip
Successfully installed pip-6.1.1 setuptools-15.2

# See that pip point PyPy.
C:\pypy5.4
λ pypy -m pip -V
pip 6.1.1 from C:\pypy5.4\site-packages (python 2.7)

# Install Requests
C:\pypy5.4
λ pypy -m pip install requests
You are using pip version 6.1.1, however version 10.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting requests
  Downloading https://files.pythonhosted.org/packages/49/df/50aa1999ab9bde74656c2919d9c0c085fd2b3775fd3eca826012bef76d8c/requests-2.18.4-py2.py3-none-any.whl (88kB)
    100% |################################| 90kB 1.8MB/s
.........
Successfully installed certifi-2018.4.16 chardet-3.0.4 idna-2.6 requests-2.18.4 urllib3-1.22

# Test that Requests work in PyPy
C:\pypy5.4
λ pypy
Python 2.7.10 (c95650101a99, Sep 06 2016, 15:44:55)
[PyPy 5.4.1 with MSC v.1500 32 bit] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>> import requests
>>>> requests.__version__
'2.18.4'
>>>> exit()

All i have done over has nothing to do with my main OS version which is Python 3.6.