# WAP IN PYTHON TO DISPLAY ALL POSITIONS OF SUBSTRING IN THE GIVEN STRING.

str_data = input("Enter a string data:")
subs = input("Enter a sub-string:")

"""
find the sub-string from 0 to till last character ==> iteration
we need to continue of find the sub-string even after identified at place
we need to continue to search about the sub-string if it is not at first character
find() ==> -1, when the sub-string is not match in the given string
index() ==> value error, when the sub-string is not match in the given string
"""

flag = False
length = len(str_data)
pos = -1

while True:
    pos = str_data.find(subs,pos+1,length)

    if pos == -1:
        break
    print("The Sub-string is found at:",pos)
    flag = True

if flag == False:
    print("The Sub-string is not found at any index.")

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

replacing of a string with another string
==============================
"Python is Very Difficult to learn"
"Difficult" ===> "Easy"
"Python is Very Easy to learn"

replace()
=======

Syntax:
	str_data/str_object.replace('old_string','new_string')

str_data = "Python is Very Difficult to Learn"

sub_str = "Easy"

res_str = str_data.replace('Difficult',sub_str)

print(str_data)
print(res_str)

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

Python is Unicode Dependent Programming Language
==========================================

C/C++ ==>
	characters ==> 256 characters
		ASCII Values ==> 0 to 255

Java/Python ==> 2-bytes
	65536 characters
		0 to 65535 ==> Unicode

0 TO 9 ==> 48 TO 56
A TO Z ==> 65 TO 90
a to z ==> 97 to 122

ord()
====
==> which can accept a character
	return a unicode of the accepted character's
Syntax:
	ord(character)

print(ord('A'))
print(ord('b'))
print(ord("r"))
print(ord('9'))
print(ord('@'))

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

chr()
===
==> pre-defined method
	which can access a unicode value
		and return the corresponding character value
Syntax:
	chr(unicode)

print(chr(65535))
print(chr(0))
print(chr(100))
print(chr(1000))

for i in range(65536):
    print("The Character at the Unicode {} is = {}".format(i,chr(i)))

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

STRING TO LIST
=============
split()
====
	Syntax:
		str_data.split('seperator')

Ex: "Python Programming Language"
seperator ==> space
['Python','Programming','Language']

s1 = "Python Programming Language"
s2 = "Python"
s3 = "07-08-2024"
s4 = "07/08/2024"
s5 = "07.08.2024"

r1 = s1.split(' ')
r2 = s1.split()
r3 = s2.split('h')
r4 = s3.split('-')
r5 = s4.split("/")
r6 = s5.split('.')


print(r1)
print(r2)
print(r3)
print(r4)
print(r5)
print(r6)

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

LIST TO STRING
=============
join()
====
used to join the individual elements of the list into string based on the separator.
Syntax:
	'separator'.join(list_data)

l1 = ['Python','is','easy','language']
l2 = ['08','07','2024']

s1 = ' '.join(l1)
s2 = '-'.join(l2)
s3 = '/'.join(l2)
s4 = '.'.join(l2)

print(s1)
print(s2)
print(s3)
print(s4)