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Need help to understand series()

from pandas import DataFrame,Series
context.slopes = Series()
context.slopes = context.slopes.append(Series(slope,index=[exchange_time]))

I am trying to understand these 3 lines of codes in the whole code there is only 3 lines with series.... regards to the second line, why is there no definition or fills of whats in the Series(), how do I find out what this Series() is referring to?

Many many thanks