Using built-in pandas methods to handle missing values in groups: a more straightforward approach.

Understanding Dataframe Alignment Issues in Pandas: A Guide to Dividing Stock Prices with Pair Trading Using Pandas and Matplotlib

Counting NaN Rows in a Pandas DataFrame with 'Unnamed' Column

Understanding NaN vs None in Python: When to Choose Not-A-Number Over Empty Cell Representations

Merging Adjacent Columns Containing Missing Values in Pandas Using `combine_first` and `fillna`