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Control Flow Statements:

In this module we will be discussing one of the most important building blocks of Python Programming Language.
The ability to change the behavior of a piece of code which is based on certain information in the environment is known as conditional code flow. The conditional logic in Python is primarily based on the “if … else” structure.

 Here, we will be discussing:

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If Statement

If-statement is used to test a condition, if-condition is true then the code inside the if statement is executed otherwise that code is not executed.

Syntax:

if condition :
statement

Python1

e.g.

i=1
if i==1:
print “Hello intellipaat”Output –
Hello intellipaat

If-else

If else is also used to test a condition, if condition is true then the code inside the if statement is executed otherwise else part is executed.

Syntax: 

If condition:
statements
else:
statements

Java2

e.g.

i=1
if i==2:
print (“Hello intellipaat”)
else:
print (“Hello”)
Output
Hello

Nested If

It contains multiple if else condition. It is used to check the multiple conditions. This statement is like executing a if statement inside an else statement.

Syntax:

if condition1:
statement
if condition2:
statement
elif condition3:
statement
else
statement

e.g.

i = 1
if i < 3:
print (“i is less than 3”)
if i == 2:
print (“value of I is equal to 2”)
elif:
print (“value is not equal to 2”)
else:
print (“Not found the true expression”)Output
i is less than 3
value is not equal to 2

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Python break

It is a jump statement which is used to transfer the control to the end of loop.

Python3
e.g.

for i in [10,20,30,40]:
if i==30:
print (“Item Found”)
break
print (i)Output
10
20
Item Found

 

Python Continue Statement

It is also a jump statement which is used to skip the current statement and forces to execute next iteration.

Python4
e.g.

for i in [10,20,30,40]:
if i==30:
print(“Item Found”)
continue
print(i)Output
10
20
Item Found
40
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Loops:

While Loop

In this body is executed until the condition is true. Once the condition becomes false then control comes out the loop.

Syntax:

while condition:
A body of while loop

Python5
e.g.

i = 10
while i>5:
print(i)
i=i-1Output
10
9
8
7
6

For Loop

For loop executes the sequence of code according to the specified times and conditions.

Syntax:

for a variable in sequence:
A body of for loop

Python6
e.g.

i=1
for i in range(1,8):
print 2*i
Output
2
4
6
8
10
12
14

Nested Loop

Loop defined within another loop is known as nested loops.

Syntax:

for condition1:
for condition2:
Body of for loop

This brings us to the end of the python loops. In the next module, we will be discussing the functions and see how they work.

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