Learning inheritance

[Niklasro]

Hi
How can I make the visibility of a variable across many methods or
files? To avoid repeating the same line eg     url =
os.environ['HTTP_HOST'] if os.environ.get('HTTP_HOST') else
os.environ['SERVER_NAME'] I repeat for many methods. So declaring it
to a super class and inheriting it is my plan. Do you agree or propose
otherwise?
Thanks
Niklas
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