Expressions

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.

>>>x = 5 
>>>x + 17 
22

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

>>> 2+5
7 

Important: expressions in a script all by itself doesn’t do anything. This can be common source of confusion for beginners.

What is result of the following expression.

>>> x = 5
>>> x + 1 
6