python - get value out of dataframe

Question

In Scala I can do get(#) or getAs[Type](#) to get values out of a dataframe. How should I do it in pyspark?

I have a two columns DataFrame: item(string) and salesNum(integers). I do a groupby and mean to get a mean of those numbers like this:

saleDF.groupBy("salesNum").mean()).collect()

and it works. Now I have the mean in a dataframe with one value.

How can I get that value out of the dataframe to get the mean as a float number?

Answer 1

collect() returns your results as a python list. To get the value out of the list you just need to take the first element like this:

saleDF.groupBy("salesNum").mean()).collect()[0]