Page 128 - Computer Genius Class 08
P. 128
The sequence in which a program's code is executed is known
as the control ow. sually, a program s ow is from top to
bottom, but what if we want a particular code to only be
executed when it fulfills a specific condition or wants to run
a block of the code a specified number of times? Control ow
statements are the statements that ensure a smooth and
intentional ow of a program. In general, there are three
types of statements in Python.
These are:
l Sequential statements
l Conditional Statements
l Iterative or looping Statements
Sequential Statements
As the name implies, these types of statements are executed sequentially, one after another. It is
mostly used for simple programs. For example:
print("Hi")
print ("hello")
print ("how are you")
Conditional Statements
A conditional statement helps to implement decision-making in a program. These statements always
result into two outcomes based on specific conditions given by the user. If the condition gets true,
the code gives out the first outcome but, if it s false, the second outcome is returned. ome of the
conditional statements are:
l if Statement
l if-else Statement
l if-elif-else Statement
if Statement
The if statement is the simplest conditional statement.
l Here, the program evaluates the test expression and will execute statement(s) only if the test
expression is True. If the test expression is False, the statement(s) is not executed.
l In Python, the body of the ‘if’ statement is indicated by the indentation. Body starts with an
indentation and the first unindented statement marks the end.
l Python interprets non-zero values as True.
l None and 0 are interpreted as False.
126 Computer Genius-VIII

