Tidy Up Author Names

PandasEasyJunior level~10 min

Problem

You are given a DataFrame `author` with columns `author_id` and `pen_name`. Each pen name may be stored with inconsistent capitalisation.

Return each `author_id` together with a tidied `pen_name` where the first letter is uppercase and every following letter is lowercase. Order the result by `author_id`. Output columns: `author_id`, `pen_name`.

Input data

Example rows — the live problem includes the full dataset.

author

author_id	pen_name
1	aLICE
2	BORIS
3	cora

Expected output

Your answer should return 3 rows with the columns author_id, pen_name.

Starter code (Pandas (Python))

import pandas as pd

def tidy_author_names(author) -> pd.DataFrame:
    # Your code here
    return author

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