Loops In Python

 

Loops

Loop is a repetitive process of an operation.

Python Provides 2 types of Loops

• for loop

• while loop

For loop

Syntax :

        for variable in Sequence

• variable represents to an individual element of sequence

• sequence is nothing but a string, list, tuple or dictionary

 # program to understand for loop

 name = "Techno Xpresss"

 for x in name:
     print(x)

 print("for loop completed")


 #output
 T
 e
 c
 h
 n
 o

 X
 p
 r
 e
 s
 s
 s
 for loop completed
    

so here name is a sequence, which is string and x is a variable, picking up single character as an element and printing.

Every element is printed in next line, as by default print() ends with "\n" (new-line), but no worries, python provide developer to change the ending value of print()

 # program to understand for loop

 name = "Techno Xpresss"

 for x in name:
     print(x, end = "")    # changing end to no action

 print("\nfor loop completed")


 #output
 Techno Xpresss
 for loop completed

 # program to understand for loop

 name = "Techno Xpresss"

 for x in name:
     print(x, end =  " ")     # changing end to space

 print("\nfor loop completed")


 #output
 T e c h n o   X p r e s s s 
 for loop completed

While Loop

Syntax : 

        while (condition is true)

 # program to understand while loop
 a=1
 while (a != 11):
     print(a)
     a += 1


 #output
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10

 # program to understand for loop
 a=1
 while (a != 11):
     print(a, end = " ")
     a += 1


 #output
 1 2 3 4 5 6 7 8 9 10