Control Statements

Team Emertxe

Single Control Statements

If Statements

If-Else

• Syntax

if condition:

statements else:

statements

λ

Example

if num % 2:

print("ODD") else:

print("EVEN")

If Statements

If-Elif-Else

• Syntax

if condition1:

statements elif condition2:

statements else

statements

λ

Example

if num == 1:

else:

print("You entered 3")

Multiple Control Statements

Multiple Statements

While

• Syntax

while condition: statements

λ

Example

i = 1

while i <= 10: print(i)

i = i + 1

Multiple Statements

For

• Syntax

for var in sequence: statements

λ

Example-v1.1

str = "Hello"

for ch in str: print(ch, end='')

λ

Example-v1.2

n = len(str)

for i in range(n): print(str[i])

Else Suite

Multiple Statements

For with Else suite

• Syntax

for var in sequence: statement / statements

else:

statement / statements

λ

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

λ

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

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)

THANK YOU