[Python] How do I find the mode of a column of categorical data?

I want to find the most repetitive value (which is the mode) of a column of categorical data and fill the blank cells with this value.

"Embarked" column has only three values: S,Q,C

When I try to calculate mean and median it gives an error already, because its no numerical value, but I can take a mode of this column, when I try this part of code it doesn't give an error:

embarked=df_missing['Embarked']
df_missing['Embarked']=df_missing['Embarked'].fillna(embarked.mode())


But it also doesn't fill the empty cells. How can I find the mode of this column.

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