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Chapter Profile
9 Chapter Profile Decision Making Statements
The if Statement
Conditional The if…else Statement
Nested if Statement
The if…elif…else Ladder
Statements
in Python
There are situations in life when we need to decide based on a situation. For example, if it rains,
I will stay at home or else I shall visit the market. Similar situations arise in programming as
well, where we need to make some decisions and based on these decisions, execute a set of
commands. We need to determine which action is to be taken and which statement is to be
executed, if the outcome is true or false. In this chapter, we will learn about decision making
statements of Python.
DECISION MAKING STATEMENTS
Decision making in Python is done by conditional statements which decide the flow of program
execution. The following conditional statements are available in Python:
if statement if...else statement
Nested if statement if…elif…else ladder
THE IF STATEMENT
The if statement is the simplest conditional statement. Here, a Start
statement or a collection of statements within the if block is
executed only if a certain condition or expression evaluates to
True. If the condition evaluates to False, then the control of False
execution is passed to the next statement after the if block. if condition
Syntax: True
if (Test Expression): Statements in
if block execute
Indented statement block
# if block ends here
Stop
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