python – NameError: name ‘Seq’ is not defined

I want to fill null value with Average.

data2 = data.na.drop(Seq("code")).select(avg(col("code")))
data2.display()

This error I got:

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<command-1060196488305723> in <module>
----> 1 data2 = data.na.drop(Seq("code")).select(avg(col("code")))
      2 data2.display()

NameError: name 'Seq' is not defined

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