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2.6: Expressions

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  • An expression is a combination of values, variables, and operators. A value all by itself is considered an expression, and so is a variable, so the following are all legal expressions (assuming that the variable x has been assigned a value):

    x + 17

    If you type an expression in interactive mode, the interpreter evaluates it and displays the result:

    >>> 1 + 1

    But in a script, an expression all by itself doesn't do anything! This is a common source of confusion for beginners.

    Exercise 1: Type the following statements in the Python interpreter to see what they do:

    x = 5
    x + 1
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