求助：按DataFrame首行值的顺序展开并排序数据

Suppose I have a DataFrame with the following format of strings separated by commas:

The actual number of rows will be greater than 10,000.

I want to expand the DataFrame and sort the DataFrame by row 0.

My expected output is below, where None is of type NoneType:

I have expanded the data using the following code:

df = df['ColumnName'].str.split(',', expand=True)  # Expand initial DataFrame

However, I am unable to sort or reorder the data as desired despite trying various combinations of df.sort_values().

备注：内容来源于stack exchange，提问作者user29981437