Python Example Code: Find out string is palindrome or not

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2 Check Whether or Not the Number is a Palindrome in Python

Find out string is palindrome or not

	string=input(("Enter a string:"))
	if(string==string[::-1]):
	print("The string is a palindrome")
	else:
	print("Not a palindrome")

view raw palindrome.py hosted with

by GitHub

Check Whether or Not the Number is a Palindrome in Python

Method 1: Using Simple Iteration.
Method 2: Using String Slicing.
Method 3: Using Recursion
Method 4: Using Character matching
Method 5: Using Character matching updated
Method 6: Using Built-in reversed function
Method 7: Building reverse one char at a time
Method 8: Using Flag and backward reading
Method 9: Bonus using backward slicing

	num=int(input("Enter a number:"))
	temp=num
	rev=0
	#rev = reversed
	#dig = remainder
	while(num>0):
	dig=num%10
	print("Dig=" , dig)
	rev=rev*10+dig
	print("rev=" , rev)
	num=num//10
	print("num=" , num)
	if(temp==rev):
	print("The number is palindrome!")
	else:
	print("Not a palindrome!")

view raw palindrome.py hosted with

by GitHub

	num = 1221
	temp = num
	reverse = 0
	while temp > 0:
	remainder = temp % 10
	reverse = (reverse * 10) + remainder
	temp = temp // 10
	if num == reverse:
	print('Palindrome')
	else:
	print("Not Palindrome")

view raw palindrome1.py hosted with

by GitHub

	num = 1234
	reverse = int(str(num)[::-1])

	if num == reverse:
	print('Palindrome')
	else:
	print("Not Palindrome")

view raw palindrome2.py hosted with

by GitHub

	def recurrev(number, rev):
	if number == 0:
	return rev

	remainder = int(number % 10)
	rev = (rev * 10) + remainder

	return recurrev(int(number / 10), rev)


	num = 12321
	reverse = 0
	reverse = recurrev(num, reverse)

	print(str(num) + " is: ", end="")
	print("Palindrome") if reverse == num else print("Not Palindrome")

view raw palindrome3.py hosted with

by GitHub

	def checkPalindrome(str):

	# check if str[i] is same as str[len(str) - i - 1]
	# for whole string
	for i in range(0, len(str)):

	# Basically, we are checking i-th character is
	# same as i-th character from the end or not
	if str[i] != str[len(str) - i - 1]:
	return False

	return True


	# main function
	s = "kayak"

	print("Palindrome") if checkPalindrome(s) else print("Not Palindrome")

view raw palindrome4.py hosted with

by GitHub

	# we do not need to check the whole string
	# only till the mid of string
	# as if it palindrome the first half == second half of string when read backwards
	def checkPalindrome(str):

	# Run loop from 0 to len/2
	mid = int(len(str) / 2)

	for i in range(0, mid):
	if str[i] != str[len(str) - i - 1]:
	return False

	return True


	# main function
	s = "kayak"

	print("Palindrome") if checkPalindrome(s) else print("Not Palindrome")

view raw palindrome5.py hosted with

by GitHub

	def checkPalindrome(str):
	# using inbuilt reversed function
	reverse = ''.join(reversed(str))

	if str == reverse:
	return True

	return False


	# main function
	s = "kayak"

	print("Palindrome") if checkPalindrome(s) else print("Not Palindrome")

view raw palindrome6.py hosted with

by GitHub

	string = "123"
	# this will automatically generate reverse
	rev = ""
	for char in string:
	rev = char + rev

	print("Palindrome") if string == rev else print("Not Palindrome")

	print("string: " + str(string))
	print("rev: " + str(rev))

view raw palindrome7.py hosted with

by GitHub

	string = "radar"

	j = -1
	flag = 0
	for char in string:
	# char starts from index 0
	# string[j] forces to read from end
	# bcz negative index are read from end
	if char != string[j]:
	flag = 1
	break
	j = j - 1

	print(string + " is : ", end="")
	print("Not Palindrome") if flag else print("Palindrome")

view raw palindrome8.py hosted with

by GitHub

	str1 = "radar"
	n = len(str1)
	c = []
	for i in range(n - 1, -1, -1):
	c.append(str1[i])

	rev = "".join(c)

	print(str1 + " is: ", end="")
	if str1 == rev:
	print("Palindrome")
	else:
	print("Not Palindrome")

view raw palindrome9.py hosted with

by GitHub

Rajesh Kumar

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Python Example Code: Find out string is palindrome or not

Find out string is palindrome or not

Check Whether or Not the Number is a Palindrome in Python

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