Class variables

A class variable’s value is shared by all instances of a class.

• Also called a static variable
• If one instance sets the value of a class variable, then all the other instances see the same changed value.
• Class variables are useful for:

  • Default or ‘constant’ values (e.g. PI)
  • Lookup tables and similar structures

    
    

    Caution: do not over-use class variables

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