Using Python as a Calculator

Numbers

The interpreter acts as a simple calculator.

We can type an expression at it and it will write the value. Expression syntax is straightforward.

The operators +, -, * and / work just like in most other languages (like Pascal or C).

Parentheses (()) can be used for grouping.

Division (/) always returns a float.

It is possible to use the ** operator to calculate powers.

The equal sign (=) is used to assign a value to a variable.

If a variable is not “defined” (assigned a value), trying to use it will give you an error.

There is full support for floating point; operators with mixed type operands convert the integer operand to floating point.

In interactive mode, the last printed expression is assigned to the variable _. This means that when you are using Python as a desk calculator, it is somewhat easier to continue calculations.