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• Allowed characters: a-z A-Z 0-9 underscore, and must begin with a letter or underscore.
• Names and identifiers are case sensitive.
• Identifiers can be of unlimited length.
• Special names, customizing, etc. -- Usually begin and end in double underscores.
• Special name classes -- Single and double underscores.
  • Single leading single underscore -- Suggests a "private" method or variable name. Not imported by "from module import *".
  • Single trailing underscore -- Use it to avoid conflicts with Python keywords.
  • Double leading underscores -- Used in a class definition to cause name mangling (weak hiding). But, not often used.
  • Naming conventions -- Not rigid, but:
  • Modules and packages -- all lower case.
  • Globals and constants -- Upper case.
  • Classes -- Bumpy caps with initial upper.
  • Methods and functions -- All lower case with words separated by underscores.
  • Local variables -- Lower case (with underscore between words) or bumpy caps with initial lower or your choice.
  • Good advice -- Follow the conventions used in the code on which you are working.
• Names/variables in Python do not have a type. Values have types.