Conditions and Branching in Python

Comparison Operators

The output of Comparison operator is Boolean Value either True or False. Below are list of comparison operators and there notation which we used in python and other programming language as well..

• equal: ==
• not equal: !=
• greater than: >
• less than: <
• greater than or equal to: >=
• less than or equal to: <=

Equality Operator:

a= 9 a==9

​Output : false 

a==9—( Equality operator where value of a is equal to 9)

a=9---(Assignment operator where 9 is assigned to variable a)

Inequality Operator:

The inequality test uses an exclamation mark before the equal sign, If value of two operands id not equal then result will come as True and if the value of two operand is equal then result will be as false..

Example 1>

i = 5 i != 6

Output :True

Example 2>

When i equals 6 the inequality expression produces False.

i = 6 i != 6

​Output : false

Comparison Between Strings:

We can apply comparison operator over string also. See the below examples for more clearity..

Example 1:

"CRICKET" == "FOOTBALL"

Output : False

Example 2:

If we use the inequality operator, the output is going to be True as the strings are not equal.

"CRICKET" != "FOOTBALL"

Output:True

Inequality operation is also used to compare the letters/words/symbols according to the ASCII value of letters. The decimal value shown in the following table represents the order of the character:

For example, the ASCII code for ! is 21, while the ASCII code for + is 43. Therefore + is larger than ! as 43 is greater than 21.

Similarly, the value for A is 101, and the value for B is 102 therefore:

'B' > 'A'

Output=True

​

When there are multiple letters, the first letter takes precedence in ordering:

'BA' > 'AB'

Output=True

Note: Upper Case Letters have different ASCII code than Lower Case Letters, which means the comparison between the letters in python is case-sensitive.

Reference : Python Doc