From the dataframes created in previous question, write code to

 Q. From the dataframes created in previous question, write code to

(a) Display only column 'a' from dataframes df, df1, and df2.

(b) Display only rows 0 and 1 from dataframes df, df1, and df2.

(c) Display only column 'a' and 'b' for rows 1 and 2 from dataframes df, df1 and df2.

(d) add an empty column 'x' to all dataframes.

Answer =

(a) df["a"] , df1[“a”]  , df2[“a”]
(b) df.iloc[0:2]  df1.iloc[0:2] , df2.iloc[0:2]
(c) df[["a","b"]] , df1[["one","two"]] , df2[["one","two"]]
(d) df["X"]=[None]*len(df)