THE IF STATEMENT OF PYTHON

THE IF STATEMENT OF PYTHON

The if statement is a conditional statement in python and these implement selection constructs ( decision constructs )

An if statement tests a particular condition ; evaluates to true , a course of action is followed i.e., the – course – of action is ignored .

Before we proceed further it is important to know about the relational and logical operators you can find the relational and logical operator in our previous blog named operators , relational and logical operators will help you to learn about  the form of conditionals in this topic .

In all forms of if statement , we are using true to refer the boolean value true as well as truth value collectively ; similarly , false here will refer to boolean value false and truth value collectively .

THE if STATEMENT

The simplest form of if statement tests a condition and if the condition evaluates to true , it carries out some instructions and does nothing in case condition evaluates to false .

The if statement is a compound statement and its syntax ( general form ) is as shown below :

If < conditional expression > :

Statement } > the statement inside an if are indented at same level

Where a statement may consist of single statement , a compound statement , or just the pass statement ( in case of empty statement ) . for instance , we

consider the following code –

If ch == ‘ ’ :

In this –

Single quotes ( ‘ ’ ) are conditional expression

Colon ( : ) are the header of if statement ; please notice the colon ( : ) at the end

Spaces + = 1

Chars + = 1

In these 2 lines are the body of if . please notice that all the statement in the if body are indented at same level .

NOTE – INDENTATION IN PYTHON IS VERY IMPORTANT

In an if statement , if the conditional expression evaluates to true , the statements in the body – of – if are executed , otherwise ignored .

The above code will check whether the character variable ch stores a space or not ; if it does then the condition ch == ‘ ’ evaluates to true .


IN THE NEXT BLOG WE LEARN SOME PROGRAMS ON IF STATEMENT AND ANOTHER IMPORTANT STATEMENT IF – ELSE STATEMENT 
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