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Python Variables

Variable Names:

  • Must start with a letter or an underscore
  • Can only contain alpha-numeric characters and underscores (A-z, 0-9, and _)
  • Case sensitive (Angle is not the same as angle)

A Variety of Values can be Assigned to Variables

  • Use an equal sign = to assign a value to a variable
  • The variable ALWAYS appears to the left of the equal sign
  • Some valid examples:
    • Text: angle = "Ninety degrees"
    • A number with a decimal point: angle = 90.0
    • A number without a decimal point: angle = 90
    • A collection: angle = ["Ninety", 90.0, 90]
  • SayHello
  • _goodbye!
  • 2For1
  • another_variable
  • X
  • _42

Algebraic Operations with Variables

  • Addition +
  • Subtraction -
  • Multiplication *
  • Division /
  • Integer or Floor Division //
  • Examples of an Operation and Assignment +=, -=, *=, /=, or //=