Python programming : Control statements

May 9, 20191 like4,002 views

Emertxe Information Technologies Pvt Ltd

In this module of python programming you will be learning about control statements. A control statement is a statement that determines whether other statements will be executed. An if statement decides whether to execute another statement, or decides which of two statements to execute. A loop decides how many times to execute another statement.

If Statements
If-Else
 Syntax
if condition:
statements
else:
statements

Example
if num % 2:
print("ODD")
else:
print("EVEN")

Most read

Multiple Statements
For
 Syntax
for var in sequence:
statements

Example-v1.1
str = "Hello"
for ch in str:
print(ch, end='')

Example-v1.2
n = len(str)
for i in range(n):
print(str[i])

Multiple Statements
For with Else suite
 Syntax
for var in sequence:
statement / statements
else:
statement / statements

Example
for i in range(5):
print(i)
else:
print("Over")

Multiple Statements
While with Else suite
 Syntax
while condition:
statement / statements
else:
statement / statements

Example
i = 0
while i < 5
print(i)
i += 1
else:
print("Over")
While searching an elemnt in the sequence is not found,
else will be the best option to display the item not found

Misc Statements
Break
 Example
x = 10
while x >= 1:
print("x = ", x)
x -= 1
if x == 5:
break

Misc Statements
Continue
 Example
x = 10
while x >= 1:
if x == 5:
x -= 1
continue
print("x = ", x)
x -= 1

Misc Statements
Pass
 Example-1
x = 0
while x < 10:
x += 1
if x == 5:
pass
print(x)

Misc Statements
Pass
 Example-2: Program to retrieve only the negative numbers from the list
num = [1, 2, 3, -4, -5, -6, 7, 8]
for i in num:
if (i > 0):
pass
else:
print(i)
Pass does nothing

Misc Statements
Assert
 Syntax:
assert expression, message
 Example-1
num = int(input("Enter the number greater than zero: "))
assert num > 0, "Wrong input"
print("Num: ", num)

Misc Statements
Assert: Try Except
 Example-1
num = int(input("Enter the number greater than zero: "))
try:
assert num > 0, "Wrong input"
print("Num: ", num)
except AssertionError:
print("You entered wrong input")
print("Enter positive number")

Misc Statements
Return
 Example-1: To add two numbers & return the result
def sum(a, b):
return a + b
res = sum(5, 10)
print(res)

If Statements
If-Elif-Else
 Syntax
if condition1:
statements
elif condition2:
statements
else
statements

Example
if num == 1:
print("You entered 1")
elif num == 2:
print("You entered 2")
else:
print("You entered 3")

Multiple Statements
While
 Syntax
while condition:
statements

Example
i = 1
while i <= 10:
print(i)
i = i + 1

YouTube Link: https://youtu.be/nMEFZ6TvkDA ** Python Certification Training: https://www.edureka.co/python ** This Edureka PPT on 'If Else In Python' will help you understand how you can use a conditional if and else statements in python for decision making with concepts like shorthand if and else, nested if-else, etc. Following are the topics discussed: What Are Python Conditions? What Is If And If Else In Python? Syntax For If Else In Python Shorthand If Else Use Case - Nested If Else Follow us to never miss an update in the future. YouTube: https://www.youtube.com/user/edurekaIN Instagram: https://www.instagram.com/edureka_learning/ Facebook: https://www.facebook.com/edurekaIN/ Twitter: https://twitter.com/edurekain LinkedIn: https://www.linkedin.com/company/edureka Castbox: https://castbox.fm/networks/505?country=in

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Python programming : Control statements

1. Control Statements Team Emertxe

2. Single Control Statements

3. If Statements If-Else  Syntax if condition: statements else: statements  Example if num % 2: print("ODD") else: print("EVEN")

4. If Statements If-Elif-Else  Syntax if condition1: statements elif condition2: statements else statements  Example if num == 1: print("You entered 1") elif num == 2: print("You entered 2") else: print("You entered 3")

5. Multiple Control Statements

6. Multiple Statements While  Syntax while condition: statements  Example i = 1 while i <= 10: print(i) i = i + 1

7. Multiple Statements For  Syntax for var in sequence: statements  Example-v1.1 str = "Hello" for ch in str: print(ch, end='')  Example-v1.2 n = len(str) for i in range(n): print(str[i])

8. Else Suite

9. Multiple Statements For with Else suite  Syntax for var in sequence: statement / statements else: statement / statements  Example for i in range(5): print(i) else: print("Over")

10. Multiple Statements While with Else suite  Syntax while condition: statement / statements else: statement / statements  Example i = 0 while i < 5 print(i) i += 1 else: print("Over") While searching an elemnt in the sequence is not found, else will be the best option to display the item not found

11. Misc Statements

12. Misc Statements Break  Example x = 10 while x >= 1: print("x = ", x) x -= 1 if x == 5: break

13. Misc Statements Continue  Example x = 10 while x >= 1: if x == 5: x -= 1 continue print("x = ", x) x -= 1

14. Misc Statements Pass  Example-1 x = 0 while x < 10: x += 1 if x == 5: pass print(x)

15. Misc Statements Pass  Example-2: Program to retrieve only the negative numbers from the list num = [1, 2, 3, -4, -5, -6, 7, 8] for i in num: if (i > 0): pass else: print(i) Pass does nothing

16. Misc Statements Assert  Syntax: assert expression, message  Example-1 num = int(input("Enter the number greater than zero: ")) assert num > 0, "Wrong input" print("Num: ", num)

17. Misc Statements Assert: Try Except  Example-1 num = int(input("Enter the number greater than zero: ")) try: assert num > 0, "Wrong input" print("Num: ", num) except AssertionError: print("You entered wrong input") print("Enter positive number")

18. Misc Statements Return  Example-1: To add two numbers & return the result def sum(a, b): return a + b res = sum(5, 10) print(res)

19. THANK YOU

Python programming : Control statements

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