Python 3 - Second Edition

10.2    Operators

You know the term operator from math, where it denotes a formula character that stands for a certain arithmetic operation. In Python, for example, you can use operators to combine two numeric values into an arithmetic expression:

>>> 1 + 23  

The values to which an operator is applied—in this case, 1 and 2—are called operands. There are also operators for other data types. For example, + can be used to join two strings:

>>> "A" + "B"'AB'  

So in Python, the meaning of an operator depends on which data type it is applied to.

10.2.1    Operator Precedence

We’ll limit ourselves in this section to the operators +, -, *, and <, which are sufficient to explain the underlying principle. In the following examples, the three references ...