7.py

# Python program to demonstrate
# symmetry and palindrome of the
# string


# Function to check whether the
# string is palindrome or not
def palindrome(a):

	# finding the mid, start
	# and last index of the string
	mid = (len(a)-1)//2  # you can remove the -1 or you add <= sign in line 21
	start = 0  # so that you can compare the middle elements also.
	last = len(a)-1
	flag = 0

	# A loop till the mid of the
	# string
	while(start <= mid):

		# comparing letters from right
		# from the letters from left
		if (a[start] == a[last]):

			start += 1
			last -= 1

		else:
			flag = 1
			break

	# Checking the flag variable to
	# check if the string is palindrome
	# or not
	if flag == 0:
		print("The entered string is palindrome")
	else:
		print("The entered string is not palindrome")

# Function to check whether the
# string is symmetrical or not


def symmetry(a):

	n = len(a)
	flag = 0

	# Check if the string's length
	# is odd or even
	if n % 2:
		mid = n//2 + 1
	else:
		mid = n//2

	start1 = 0
	start2 = mid

	while(start1 < mid and start2 < n):

		if (a[start1] == a[start2]):
			start1 = start1 + 1
			start2 = start2 + 1
		else:
			flag = 1
			break

	# Checking the flag variable to
	# check if the string is symmetrical
	# or not
	if flag == 0:
		print("The entered string is symmetrical")
	else:
		print("The entered string is not symmetrical")


# Driver code
string = 'amaama'
palindrome(string)
symmetry(string)