Page 182 - Computer Science V2.0 Class 11

Table 7.7: Precedence of Operators in Python
Order Of Precedence Operators Description
1 ** Exponentiation

2 ~, +, - Complement, unary plus, and unary
minus

3 *, / , %, // Multiply, divide, modulo, integer division
4 +, - Addition, subtraction
5 in, not in, is, is not, <, <=, Membership, identity and relational
>, >=,!=, == operators
6 not, and, or Logical Operator
7 =, %=, /=, //=, -=, +=, *=, Assignment operators
**=
The parenthesis () is used to override the precedence of operators. For example, in the expression 4*(3+7), even
though the * operator has precedence over the + operator, the + operator will get precedence over the * operator
because the subexpression 3+7 is enclosed within parentheses. If two binary operators have the same precedence,
then the expression is evaluated from left to right. However, the binary operator ** is an exception to the general
rule and is evaluated right to left. Thus, the expression 2**3**3 would be evaluated as if it were parenthesized as
2**(3**3) and yield the value 134217728. All unary operators are evaluated from right to left, for example, the
expression not not True yields True. Next, let us consider some more examples of expressions.
Evaluate the expressions given below:

(i) 45*6+3/5
Solution:
45*6+3/5
= 270+3/ 5

= 270+0.6
= 270.6

(ii) 45*(6+3)/5
Solution:

= 45*(9)/5 …… expression within the () will be evaluated first
= 405/5

= 81.0
(iii) 4 >= 5*3//4
Solution:

= 4 >= 15//4 …………* is evaluated
= 4 >= 3 ………. // is evaluated
= True …….. >= 3 is evaluated

(iv) True and False or not True
Solution:
= True and False or not True
= False or False

= False

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