获取Python中DataFrame列值的频率

Question

Part of a homework question I got: I need to get the frequency of a unique value inside a column from a DataFrame, using Pandas. But, I must use crosstab() function!

Here is part of the DataFrame

And I want to get the frequency (in percentage) of the value 'E' in the 'color' column.

Here is how the result should look like:

And this is what I have so far:

What am I doing wrong? How can I get it the same?

Answer 1

pd.crosstab("", dataframe[], normalize=True)