ss = [['xx','m',22],['cc','w',33],['jj','w',44],['qq','m',11]]import pandas as pddf = pd.DataFrame(ss)df.columns=['name','gender','age']phone = pd.Series([21000,18900,18000])phone = pd.Series([21000,18900,18000],index=['iphone7','oppo','sunsumg'])phone[1]      phone[1:3]      phone['oppo']   ss = [['xx','m',22],['cc','w',33],['jj','w',44],['qq','m',11]]import pandas as pddf = pd.DataFrame(ss)df.columns=['name','gender','age']dfdf.head(3)     df.tail(3)      df.info()     df.describe()