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Python 3 - Operators Precedence Example
The following table lists all operators from highest precedence to the lowest.
| Sr.No. | Operator & Description |
|---|---|
| 1 | ** Exponentiation (raise to the power) |
| 2 | ~ + - complement, unary plus and minus (method names for the last two are +@ and -@) |
| 3 | * / % // Multiply, divide, modulo and floor division |
| 4 | + - Addition and subtraction |
| 5 | >> << Right and left bitwise shift |
| 6 | & Bitwise 'AND' |
| 7 | ^ | Bitwise exclusive `OR' and regular `OR' |
| 8 | <= < > >= Comparison operators |
| 9 | <> == != Equality operators |
| 10 | = %= /= //= -= += *= **= Assignment operators |
| 11 | is is not Identity operators |
| 12 | in not in Membership operators |
| 13 | not or and Logical operators |
Operator precedence affects the evaluation of an expression.
For example, x = 7 + 3 * 2; here, x is assigned 13, not 20 because the operator * has higher precedence than +, so it first multiplies 3*2 and then is added to 7.
Here, the operators with the highest precedence appear at the top of the table, those with the lowest appear at the bottom.
Example
#!/usr/bin/python3
a = 20
b = 10
c = 15
d = 5
print ("a:%d b:%d c:%d d:%d" % (a,b,c,d ))
e = (a + b) * c / d #( 30 * 15 ) / 5
print ("Value of (a + b) * c / d is ", e)
e = ((a + b) * c) / d # (30 * 15 ) / 5
print ("Value of ((a + b) * c) / d is ", e)
e = (a + b) * (c / d) # (30) * (15/5)
print ("Value of (a + b) * (c / d) is ", e)
e = a + (b * c) / d # 20 + (150/5)
print ("Value of a + (b * c) / d is ", e)
Output
When you execute the above program, it produces the following result −
a:20 b:10 c:15 d:5 Value of (a + b) * c / d is 90.0 Value of ((a + b) * c) / d is 90.0 Value of (a + b) * (c / d) is 90.0 Value of a + (b * c) / d is 50.0