Python - Things to know before proceed - Precedence & Associativity Of Operator Tutorial

​Precedence

In Expression, there can be one or more operators. To evaluate such type of expression there is the rule of Precedence in python

For example:-

Let consider an expression 10 + 5 * 3.

In the above expression * (multiplication) has higher precedence than + (addition).but we can change the order using parenthesis, as it has higher precedence than multiplication.

i.e (10 + 5) * 3

Precedence  Table ( Precedence in the below table will be in descending order. Upper Operator has higher precedence.)

( 2 + 6 ) * ( 10 - 8 ) / 2 ** 3 % ( 5 // 2)Example:-

( 8 ) * ( 2 ) / 2 ** 3 % ( 2 )   #First Priority to Parenthesis

8 * 2 / 8 % 2    #Then exponent

16 / 8 % 2    #Then multiplication

2 % 2    #Then modulus

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Associativity

Suppose in an expression, all the operators are of the same precedence, then associativity helps to determine the order of expression. Almost all operators have Left to Right associativity. Some of them have Right to Left associativity. 

For example:-

3 + 2 + 1  #It has Left to Right associativity

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Another example with Right to Left associativity:-

3 ** 2 ** 3  #It will solve first 2 ** 3

3 ** 8

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