# WAP IN PYTHON CHECK WHETHER THE STRING IS PALINDROME STRING OR NOT.

# s = "level"
# rev_s = "level"
# rev_s == s:
# palindrome
# Otherwise ==> not palindrome

s = input("Enter a string:") # "level"

print("The Given string =",s)
print(id(s))

# reverse of the string
# print(id(s[::-1]))

rev_str = s[::-1]

# start index in the string slicing: by default, the slicing can start from index '0'
# end index in the string slicing: the slicing can end at the last character.
print(s)
print(id(s))

if rev_str == s:
    print("The string is palindrome")
else:
    print("The string is not palindrome.")
====================================================
String Comparison:
==================
Note:
=====
Python-2: cmp()
Python-3: cmp() got deprecated.

Relational Operators:
=====================
Operator ==> symbol which can denote an operation.
Ex: + == addition
Relational Operators:
	<, >, <=, >=, ==, !=

String with characters:
	"Ashok IT"
	each character can be represented with one integer value (ASCII value/Uni Code)

ASCII ==> 256 values ==> 0 to 255
ex: A to Z ==> 65 to 90
a to z ==> 97 to 122

Unicode ==> 65536 ==> 0 to 65535
A to Z ==> 65 to 90
a to z ==> 97 to 122

ord():
=====
==> accept a character
	and return a Unicode value for that corresponding character.
Syntax:
	ord(character)

print(ord('a'))
print(ord('A'))
print(ord('z'))
print(ord('Z'))

Ex:
"abc" < "Abc" ==> False
97 < 65

s1 = "abcd"
s2 = "ABCD"
s3 = "abcD"
s4 = "abcd"

print(s1 == s3) # False
print(s1 == s4)

print(s1 < s2)
====================================
Removing of blank spaces from the string:
=========================================
"Python Programming"

1) we cannot remove the white space between the string.
2) we can remove the white space from the beginning of the string and/or ending of the string.
"   Python programming   "

==> three functions:
	1) strip() ==> can remove blank spaces from beginning and ending part of the string
	Syntax:
		str-obj-name.strip()
	2) rstrip() ==> can remove the spaces from right side of the string
	Syntax:
		str-obj-name.rstrip()
	3) lstrip() ==> can remove the spaces from left side of the string
	Syntax:
		str-obj-name.lstrip()

s1 = "Python Programming"
s2 = "   Ashok IT   "

print("The Strings are = ")
print(s1)
print(s2)

print(s1.strip())
print(s1.lstrip())
print(s1.rstrip())

print(s2.strip())
print(s2.lstrip())
print(s2.rstrip())
===========================================
Finding substrings:
===================
index():
=======
==> can accept the sub-string (part of the string)
and return the first occurrence (index)
Syntax:
	str-obj-name.index(sub-string) 
==> by searching the sub-string from left to right (forward direction)

rindex():
========
can accept the sub-string (part of the string)
and return the first occurrence (index)
==> from right to left (reverse access)

Syntax:
	str-obj.rindex(sub-string)

s = "Object Oriented"

i1 = s.index('O') # 0 and 7
i2 = s.rindex('O')
i3 = s.index('e') # 3, 10, 13
i4 = s.rindex('e')

i5 = s.index("Orien")
i6 = s.rindex("Orien")

# i7 = s.index("B") # Type Error

print(i1)
print(i2)
print(i3)
print(i4)
print(i5)
print(i6)
# print(i7)
========================================================
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