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Please here after the typical list of addition packages I'm using.
Most of same are compliant with pip download installation mode:
pip install <package> or <installation directory>\python.exe -m pip install <package>

• doxypypy : required for documentation generation
• pylint: required for code quality
• openxl : MS Excel & Libreoffice calc files manipulation
• pyqt5 :
• py2exe
• rtcclient : optional RTC management
• lxml (see below for installation)
• pywin32 (see below fo installation)

As on Windows download pip lxml installation may failed, use the file pip installation mode:

• download the package from Unofficial Windows binaries as described by lxml.de official site.
  
• C:\Apps\Python36>python.exe -m pip install <download path location>\lxml-3.7.1-cp36-cp36m-win_amd64.whl
  

Three install solutions are availble:

1. use pypiwin32 a pip compliant version of pywin32 but at time I'm writing this lines only the 2.19 is available where the official package is now available in version 2.20
2. download the installation package from official site direct access to build 220 files
3. Install form source package

= installation issue workaround = If the install package complains to not find any Python36 amd64 installation, try using the source package

= installation from source package =

• Download the source package, unzip it
• Make sure to have latest visual studio SDK installed
• Open SDK command line (https://msdn.microsoft.com/en-us/library/x4d2c09s.aspx)
  • Choose Start, expand All Programs, Visual Studio, Visual Studio Tools, and then choose a command prompt
• Make sure your python installation is in PATH
  SET PATH=<python.exe directory path>;%PATH%
• Run the following command from source directory:\\C:\Apps\Python36\pywin32-220>python setup3.py -q install
• If your experimented the following issue
  

> python setup3.pl install
Converting...
Executing...
Building pywin32 3.6.220.0
Traceback (most recent call last):
File "setup3.py", line 16, in <module>
    exec(str(got))
File "<string>", line 1944, in <module>
File "<string>", line 594, in __init__
File "C:\Apps\Python36\lib\ntpath.py", line 75, in join
    path = os.fspath(path)
TypeError: expected str, bytes or os.PathLike object, not NoneType

Setup.py is looking for Visual Studio SDK and is not able to find it (I got this with Visual Studio 15), to workaorinf this you have to manually set the MsSdk environment variable.

• Search for windows.h in c:\Program Files (x86)\Microsoft SDKs
• SET MSSdk=c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\
• Run 'setup3.py -q build' or 'setup3.py -q install' command and waiting a while … (remove the -q to have detailled build) information

• For a full installation process inclusing COM components do to same configuration and commands from a Command line opened 'as Adminstrator' (right click)

SET PYTHONDIR=C:\Apps\Python36
SET PATH=%PYTHONDIR%;%PATH%
# CD %PYTHONDIR%\pywin32-220
# SET MSSdk=c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\
# python setup3.py -q build
# python setup3.py -q install

A comment is there to explain the code not to rephrase it.
Comment shall not contradict the code, update the comment with the code.

<note tip> If you don't understand why you should not modify a line, DON'T MODIFY IT! </note>

Don't modify a line just to make it nicer, better, what ever justification you want, until there is a declared issue or an enhancement or task assigned to you linked with the line.

<note warning> In any case, Keep it simple </note>

Follow the Python development guidelines described in PEP008 with the following adaptations

Configure your editor to replace tab by 4 spaces (4). If your editor is not enable to replace don't insert TAB.

Always use 4 space indentation except for arguments indentation

Use str only for internal 7 bits characters string or bytes storage

Use QString only for Qt API functions and methods, convert results as soon as possible to unicode to be compliant for Python functions.

For all other strings use unicode only strings.