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Some python idioms

• Prefer double quotes if escaping single quotes.
• Prefer string interpolation over join. Eg. "'%s'" % member_default.
• Prefer double underscore for privates.
• Prefer with statement to implicitly close file.

with open(path, 'r') as text_file:
    text = text_file.read()

• Prefer list comprehensions to filter.
• Prefer using separate modules over classes if only using for separation.
• Keep in mind: "eafp vs lbyl" (ie. just let it throw).
• Prefer exceptions over assertions.
• Throw ValueError for wrong input.
• Return explicit False if remaining case is always false.