Invalid Method for Fetching Records from Database in Python: fetchmulti()

Explanation:
The fetchmulti() method does not exist in the Python database API (DB-API) specification. Therefore, it is an invalid method for fetching records from a database within Python.

In Python, connecting to databases and executing queries is typically done using a database module that conforms to the DB-API specification. This specification defines a set of methods and conventions that database modules should adhere to in order to provide a consistent interface for interacting with databases.

The valid methods for fetching records from a database within Python are as follows:

a) fetchone(): This method is used to fetch the next row of a query result set. It returns a single row as a tuple, or None if there are no more rows.

b) fetchmany(size): This method is used to fetch the next set of rows of a query result set. The size parameter determines the number of rows to fetch. It returns a list of tuples, or an empty list if there are no more rows.

c) fetchall(): This method is used to fetch all the remaining rows of a query result set. It returns a list of tuples, or an empty list if there are no more rows.

Invalid Method:
d) fetchmulti(): This method is not a valid method in the Python DB-API specification. It does not exist in the standard set of methods provided by database modules.

Conclusion:
When fetching records from a database within Python, it is important to use the correct and valid methods specified by the DB-API. The fetchmulti() method is not a part of the standard set of methods and should not be used. Instead, the fetchone(), fetchmany(), and fetchall() methods should be used based on the specific requirements of the application.