python string index of

1# strings are immutable in Python, 
2# we have to create a new string which 
3# includes the value at the desired index
4
5s = s[:index] + newstring + s[index + 1:]

1str = 'codegrepper'
2# str[start:end:step]
3#by default: start = 0, end = len(str), step = 1
4print(str[:]) 		#codegrepper
5print(str[::]) 		#codegrepper
6print(str[5:]) 		#repper
7print(str[:8]) 		#codegrep
8print(str[::2]) 	#cdgepr
9print(str[2:8]) 	#degrep
10print(str[2:8:2]) 	#dge
11#step < 0 : reverse
12print(str[::-1]) 	#reppergedoc
13print(str[::-3]) 	#rpgo
14# str[start:end:-1]	means start from the end, go backward and stop at start
15print(str[8:3:-1]) 	#pperg

1mystring = 'hello, world'
2
3mylist = string1.split(', ') #output => ['hello', 'world']
4
5myjoin1 = ', '.join(mylist) #output => 'hello, world'
6myjoin2 = ' '.join(mylist) #output => 'hello world'
7myjoin3 = ','.join(mylist) #output => 'hello,world'

1sentence = 'Python programming is fun.'
2
3result = sentence.index('is fun')
4print("Substring 'is fun':", result)
5
6result = sentence.index('Java')
7print("Substring 'Java':", result)