The below is the example of index of a string
+---+---+---+---+---+
| H | e | l | p | A |
+---+---+---+---+---+
0 1 2 3 4 5
-5 -4 -3 -2 -1
str="Name string"
slicing example: [start:end:step]
str[start:end] # items start through end-1
str[start:] # items start through the rest of the array
str[:end] # items from the beginning through end-1
str[:] # a copy of the whole array
Below is the example usage
print str[0]=N
print str[0:2]=Na
print str[0:7]=Name st
print str[0:7:2]=Nm t
print str[0:-1:2]=Nm ti