string index

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

1  s = 'Hello'
2  len(s)   ## 5
3  ## Chars are numbered starting with 0
4  s[0]     ## 'H'
5  s[1]     ## 'e'
6  s[4]     ## 'o'  -- last char is at length-1
7  s[5]     ## ERROR, index out of bounds
8

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)