Indexing in Python | Slicing | Forward and Backward (Negative) indexing | Indexing Error | CBSE
In this Python tutorial, we will learn: What is an Indexing in Python? How can we access specific character in a string? Forward indexing with examples, Backward indexing or Negative indexes with examples, What is slicing in Python? Examples of slicing, Indexing error with example, Type error with example.
We explained how concept of Indexing and Slicing with examples.
What is indexing in Python?
In Python, a string is a sequence of characters and stored in contiguous memory location.
Each character can be individually accessed using its index.
An index is an integer.
An index of a string stars from 0. Therefore, in the string of N characters, the last character has
an index of N-1.
Python test us two-way index value for each location.
1.Forward indexing
2. Backward Indexing or Negative indexes
Forward indexing:
The index of the first character of the string is 0.
The index of the second character of the string is 1.
Backward indexing or Negative indexes:
Indexes can also have negative values.
The index of the last character of the string is - 1.
The index of the second character of the string is -2.
Slicing:
While indexing can be used to get individual characters from a string, slicing can be used to get a substring (range of characters).
Slicing can be done by specifying the start index and the end index , separated by a colon.
Indexing Error:
Python will give you an IndexError error message if you use an index that needs the index value in your string.
TypeError error:
Indexes can be only integer values; floats data types will cause a TypeError error.
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