Python Tutorial ( PDFDrive )

if statements
if...else statements
nested if statements
An if statement consists of a boolean expression followed by one or more
statements.
An if statement can be followed by an optional else statement, which
executes when the boolean expression is false.
You can use one if or else if statement inside another if or else
if statement(s).
If statements
The if statement of Python is similar to that of other languages. The if statement contains a logical expression
using which data is compared and a decision is made based on the result of the comparison.
Syntax:
The syntax of an if statement in Python programming language is:
if expression:
statement(s)
If the boolean expression evaluates to true, then the block of statement(s) inside the if statement will be
executed. If boolean expression evaluates to false, then the first set of code after the end of the if statement(s)
will be executed.
Python programming language assumes any non-zero and non-null values as true, and if it is
eitherzero or null, then it is assumed as false value.
Flow Diagram:
Example:
#!/usr/bin/python
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