Expression

Expression is the most basic kind of programming instruction in the language. Expressions consist of values (such as 4) and operators (such as +), and they can always evaluate (that is, reduce) down to a single value

>>> 4+4
8

Video

Operators

Operator	Operation	Example	Result	Remarks
**	Exponent	3**2	9	Highest Precedence
%	Modulus/remainder	5%2	1
//	Integer division/floored quotient	5//2	2
/	Divison	5/2	2.5
*	Multiplication	2*3	6
-	Subtraction	5-2	3
+	Addition	5+2	7

Operators Precedence

The order of operations (also called precedence) of Python math operators is similar to that of mathematics. The ** operator is evaluated first; the *, /, //, and % operators are evaluated next, from left to right; and the + and - operators are evaluated last (also from left to right).

Parentheses to override precedence

You can use parentheses to override the usual precedence

>>> 2+3*6
20
>>> (2+3) * 6
30

Invalid Syntax

>>> 2+*3
  File "<stdin>", line 1
    2+*3
      ^
SyntaxError: invalid syntax

You can always test to see whether an instruction works by typing it into the interactive shell. Don’t worry about breaking the computer: The worst thing that could happen is that Python responds with an error message. Professional software developers get error messages while writing code all the time.:)