LOOP STATEMENTS
================
FOR LOOP
=========
==> for ==> keyword
==> when we want execute a block of code repeatedly with each element from the collection
Syntax:
	for iteration_variable in collection:
		block of code

ex: for i in [1,2,3,4]:
	print(i)	# 1 2 3 4

# ITERATING ON STRING DATA USING FOR LOOP.

str_data = input("Enter a string data:")

# string at an index of 0 ==>
# string at an index of 1 ==>

index = 0

for i in str_data:
    # print(i)
    # print("The Character at positive index of",index,"is = ",i)
    print("The character at negative index of",index-len(str_data),"is = ",i)
    index = index + 1

# "Python"
# positive index ==> 0 to 5
# negative index ==> -1 to -6
# P ==> 0 -6 ==> 0 - 6 ==> -6

index = -1
for j in str_data[::-1]:
    print("The Character at ",index,"is = ",j)
    index -= 1

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# WAP IN PYTHON TO FIND THE PRODUCT OF ALL ODD NUMBERS FROM THE GIVEN LIST

list_data = eval(input("Enter a list data:"))

result = 1

for i in list_data:
    if i % 2 != 0:
        result = result * i

print("The Product of all Odd numbers = ",result)

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ASSIGNMENT:
===========
1) WAP TO TAKE A TUPLE DATA FROM THE KEYBOARD AND PRINT THE TUPLE ELEMENTS ALONG WITH POSITIVE INDEX AND ALSO WITH NEGATIVE INDEX.

HINT:
====
THE ELEMENT AT INDEX POSITIVE 0 AND NEGATIVE INDEX -7 = 100

2) WRITE A PYTHON TO ACCEPT A LIST AND PRINT ITS SUM OF ALL INDIVIDUAL ELEMENTS USING FOR LOOP.

===================================

==> FOR LOOP CAN ALSO BE ALLOWED TO MAKE EXECUTE THE BLOCK OF CODE ON EACH ELEMENT FROM THE RANGE OF VALUES.

range()
=====
==> used to generate a range of values
Syntax:
	range(value) ==> generate a values from '0' to 'value-1'
	range(start,stop) ==> generate values from 'start' to 'stop-1'
	range(start,stop,step) ==> generate values from 'start' to 'stop-1' with the difference of 'step'

for loop syntax with range() is:
	for iteration_variable in range():
		block of code

for i in range(10):
    print(i,end = "\t")
print()

for j in range(10,20):
    print(j,end = "\t")
print()

for k in range(10,100,20):
    print(k,end = "\t")

print()

for p in range(100,1,-10):
    print(p,end = "\t")

===============================

Nested Loops
===========
writing of a loop block in another loop block

# WAP TO PRINT ALL ARMSTRONG NUMBERS FROM 1000 TO 5000.

"""
ARMSTRONG NUMBERS
    THE SUM OF nth POWERS OF INDIVIDUAL DIGITS OF A NUMBER WHICH EQUALS TO ORIGINAL NUMBER
"""

for arm in range(1000,5001):
    # define a logic for armstrong number
    n = arm # initialization for while loop
    sum_dig = 0
    while n != 0:
        ind_dig = n % 10
        powers = ind_dig ** 4
        sum_dig = sum_dig + powers
        n //= 10

    if sum_dig == arm:
        print(arm,end = "\t")
    print()

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3) WAP TO FIND THE PALINDROME NUMBERS FROM 1000 TO 3000.
4) WAP TO PRINT ALL PRIME NUMBERS FROM 100 TO 300.