Windows 10 Python Version

[snippsat]

You most activate (base) eg trough Anaconda Prompt.
For version from python.org look at Python 3.8 (3.6-3.7) and pip installation under Windows

Here manual activate of base from cmder as i use.

G:\
λ cd Anaconda3\Scripts\

# Activate base
G:\Anaconda3\Scripts
λ activate

# See if PyPDF2 is installed
(base) G:\Anaconda3\Scripts
λ python
Python 3.7.3 (default, Mar 27 2019, 17:13:21) [MSC v.1915 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyPDF2 import PdfFileWriter, PdfFileReader
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'PyPDF2'

So no PyPDF2 have to install it with pip or conda(which also has PyPDF2),see (base) so now will pip always install to Anaconda3.

(base) G:\Anaconda3\Scripts
# Test pip
λ pip -V
pip 20.0.2 from G:\Anaconda3\lib\site-packages\pip (python 3.7)

# Install
(base) G:\Anaconda3\Scripts
λ pip install PyPDF2
Collecting PyPDF2 .....  
Successfully installed PyPDF2-1.26.0

# Test that it work.
base) G:\Anaconda3\Scripts
λ python
Python 3.7.3 (default, Mar 27 2019, 17:13:21) [MSC v.1915 64 bit (AMD64)] :: Anaconda, Inc. on win32
>>> from PyPDF2 import PdfFileWriter, PdfFileReader
>>>
>>> import PyPDF2
>>> PyPDF2.__version__
'1.26.0'
>>> exit()

(base) G:\Anaconda3\Scripts

A couple of resent Thread with this topic you can look at one, two.