#Function

In PySpark, isinstance() is a Python built-in function used to check whether an object is an instance of a specific class or a subclass thereof. It is particularly useful for type-checking PySpark objects like DataFrame, RDD, or others when working with dynamic or unknown inputs.

Syntax: -

isinstance(object, class_or_tuple)

• Check Multiple Classes
  You can check against multiple classes using a tuple:

from pyspark.sql import DataFrame
from pyspark.rdd import RDD

objects = [df, rdd, 42]
for obj in objects:
    if isinstance(obj, (DataFrame, RDD)):
        print(f"{obj} is either a DataFrame or an RDD")
    else:
        print(f"{obj} is neither a DataFrame nor an RDD")

Benefits of isinstance() in PySpark

1. Type Safety:
   • Ensures that the object is of the expected type before performing operations.
2. Dynamic Programming:
   • Useful in pipelines where the input can vary.
3. Error Prevention:
   • Helps avoid runtime errors by validating object types before proceeding.