Conditional control statement type two in Python

 Looping statements in python:

• It is used to execute continually until the condition becomes false.

Types:

• For
• While

1. for loop:

• It is used to execute a set of instructions repeatedly until the condition becomes false.

Syntax:

 for variable_name in sequence or range(start,end,step):

          Statement

Example program for for loop using sequence:

#Write a program to given word has vowels or not

count=0

a=input("Enter any word : ")

for i in a:

    if i in 'AEIOUaeiou':

        count+=1

print("This word contain vowels of count is : ",count)

Output:

Example program for for loop using start value:

#Write a program to print 1 to 10

for i in range(10):

    print(i)

Output:

Example program for for loop using start and stop value:

#Write a program to print 1 to 10

for i in range(1,11):

    print(i)        

Output:

Example program for for loop using step value:

#Write a program to print 1 to 10 by even number only

for i in range(2,12,2):

    print(i)

Output:

2. While:

• It first checks the condition then executes the result until becomes false.
• While True condition is acts as a switch statement in c++ or java.

Syntax:

 while (condition) or True:

          Statements

Example program for while condition:

#Write a program to print 1 to 10 by even number only

i=1

while i<=10:

    print(i)

    i+=1

Output:

Example program for while condition:

l=[]

ans='y'

while ans=='y':

    bno=int(input("Enter book number :"))

    bname=input("Enter book name :")

    author=input("Enter Author Name :")

    price=float(input("Enter book price :"))

    brec=str(bno) + " \t" + bname + " \t" + author + " " + str(price)

    l.append(brec)

    ans=input("Add more records?")

print("Book details :\nNumber\tName\tAuthot\tPrice")    

for i in l:

    print(i)

Output:

Example program for while condition with true statement:

#Write a program to print 1 to 10 by even number only

a,b=input("Enter two value: ").split()

choice=1

while True:

    choice=int(input("1.Add \n2.Sub \n3.Mul \n4.Div\n5.Exit 

\nEnter your choice(1 to 4):"))

    if choice==1:

        print("Add of "+a+" and "+b+" value is: ",int(a)+int(b))

    elif choice==2:

        print("Sub of "+a+" and "+b+" value is: ",int(a)-int(b))

    elif choice==3:

        print("Mul of "+a+" and "+b+" value is: ",int(a)*int(b))

    elif choice==4:

        print("Div of "+a+" and "+b+" value is: ",int(a)/int(b))

    elif choice==5:

        break

    else:

        print("Please enter correct choice...")

Output:

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