Python strings are enclosed in quotes of any type- single quotation, double quotation and triple quotation. An empty string is a string that has 0 characters(i.e., it is just a pair of quotation marks).

e.g.,

s="Python"
print(s)
a=''
print(a)

Output- 
Python

Strings are sequence of characters, where each character has a unique position-id/index.

The index of the string starts from 0. We can access characters of the string using its index number. The indexes of a string from 0 to (length-1) in forward direction and -1, -2, -3, …., -length in backward direction.

e.g.,

s="pythonpoint"
print(s[5])
a="Python"
print(s[-1])

Output-
n
n

This is all about accessing string character in python.