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03 CONDITIONAL
STATEMENTS IN PYTHON
Your Aim
to learn about:
if Statement if...else Statement
Nested if Statement if...elif...else Ladder
Some More Programs
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 in Python is done by using 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
IF STATEMENT False
Test Expression
The if statement is the simplest conditional statement. Here,
a statement or a collection of statements within the if block
True
is executed only if a certain condition or expression evaluates
to True. If the condition evaluates to False, then the control
Body of if
of execution is passed to the next statement after the if block.
Syntax:
if (Test Expression):
Statement just below if
Indented statement block
# if block ends here
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