For loop in Python

Hello friends how are you, today in this blog i will teach you what is for loop, syntax of for loop , how for loop works and many programs using for loop in a very simple way. 

Let's start

• For loop is used for sequential traversal.
• It can be used to traverse string or array.
• Iterating over a sequence is called traversal.
• For loop is used to iterate over a sequence(list,string tuple etc).

Syntax:

for variable in sequence:
    body of for_loop

• Here for is keyword.
• variable will take the value of the item inside the sequence on each iteration.
• Here sequence may be string , array etc.

Example:For loop with range function

• range() function is used to generate sequence of numbers.
• Sequence of range function is range(start,stop,step_size).
• Default step_size is 1.

/*This will generate numbers from 5 to 9*/
for x in range(5,10):
    print(x)
/*
### Output ###
5
6
7
8
9
*/

/*Here 5 is initial value 10 is final value
and step size is 2 so the output will be 5 7 9*/
for x in range(5,10,2):
    print(x)
/*
### Output ###
5
7
9
*/

Example:For loop with String

str="Easy"
for x in str:
    print(x)
/*
### Output ###
E
a
s
y
*/

Example:For loop with list

student=["Ravi","Rocky","Amisha"]
for x in student:
    print(x)
/*
### Output ###
Ravi
Rocky
Amisha
*/

Example:Table of any number

/*taking user input of no*/
no=int(input("Enter any number:"))
print("Table of ",no," is given below")
for i in range(1,11):
    print(i*no)
/*
### Output ###
Enter any number:5
Table of  5  is given below
5
10
15
20
25
30
35
40
45
50
*/

Example:For loop with else

• We can also use else statement with for loop but it is not compulsory.
• Else part will execute if the items in the sequence used in for loop exhausts.

Student=["Amisha","Rinkal","Mahima"]
for name in Student:
    print(name)
else:
    print("This is else block")
/*
### Output ###
Amisha
Rinkal
Mahima
This is else block
*/

Else part is ignored if break statement terminate the loop

• For better understanding see the example.

Student=["Amisha","Rinkal","Mahima"]
for name in Student:
    if name=="Rinkal":
        break
    else:
        print(name)
else:
    print("This is else block")
/*
### Output ###
Amisha
because when if conditon will
become true (when name=Rinkal) the
break will terminate the loop
*/

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