def top_ten(df,col):
    """
    Inputs:
    Dataframe - df
    Column - col
    
    Outputs:
    Takes the dataframe and the column name as parameters.

    Creates a new empty list called 'country_list'

    Find the top 10 values for that particular column(for e.g. 'Total_Summer') using "nlargest()" function

    From the dataframe returned by nlargest function, slices the Country_Name column and stores it in the 'country_list' list

    Returns the 'country_list'
    """
    country_list = []
    
    for i in (df.nlargest(10,col)['Country_Name']):
        country_list.append(i)
    
    return (country_list)