在Python中，可以使用Indexing方法访问String的各个字符，以访问String中的一系列字符，使用切片方法。使用切片运算符（冒号）完成字符串切片。索引允许负地址引用访问字符串后面的字符，例如-1表示最后一个字符，-2表示第二个字符，依此类推。

访问范围之外的索引将导致IndexError。只允许将整数作为索引传递，float或其他类型将导致TypeError。

# Python Program to Access

# characters of String

String1 = "GeeksForGeeks"

print("Initial String: ")

print(String1)

# Printing First character

print("\nFirst character of String is: ")

print(String1[0])

# Printing Last character

print("\nLast character of String is: ")

print(String1[-1])

# Printing 3rd to 12th character

print("\nSlicing characters from 3-12: ")

print(String1[3:12])

# Printing characters between

# 3rd and 2nd last character

print("\nSlicing characters between " +

"3rd and 2nd last character: ")

print(String1[3:-2])