Question

What is the default index type for a Pandas Series if not explicitly specified ?

• A. String
• B. List
• C. Numeric
• D. Boolean

Hint:

You can customize the index by passing a list to the index parameter while creating a Series.

Answer 1

The Correct Option is C

In the Python Pandas library, when you create a Series without providing an explicit index, Pandas automatically generates a default index.
This default index is always numeric, starting at 0 and incrementing by 1 for each element.
For example:

import pandas as pd
s = pd.Series([100, 200, 300])
print(s)

Output:

0    100
1    200
2    300
dtype: int64

As shown, the index is 0, 1, 2.
This numeric index makes it easy to reference elements by their position.
String, List, or Boolean are not used by default as index types in a Pandas Series.
Therefore, the default index type is always Numeric.