How to find maximum value of a column in python dataframe

Question

I have a data frame in pyspark. In this data frame I have column called id that is unique.

Now I want to find the maximum value of

Answer 1

if you are using pandas .max() will work :

>>> df2=pd.DataFrame({'A':[1,5,0], 'B':[3, 5, 6]})
>>> df2['A'].max()
5

Else if it's a spark dataframe:

Best way to get the max value in a Spark dataframe column