Answered: Exercise 6 (Operations on DataFrame)…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Exercise 6 (Operations on DataFrame)

Step a: Create two dataframes df1 and df2 as follows:
import numpy as np
import pandas as pd
rng = np.random.RandomState(100)
df1 = pd.DataFrame(rng.randint(0, 100, (4, 3)), columns=['A', 'B', 'C'])
df2 = pd.DataFrame(rng.randint(0, 100, (3, 4)), columns=['A', 'B', 'C', 'D'])

Step b: Create a new dataframe df which is the summation of df1 and df2;

Step c: Subtract all columns of df by the half of column 'C' in df1; (Remark: the values in df should be updated)

Step d: Replace the NaN in df by 10; (Remark: the values in df should be updated)

Step e: Use df.apply() to calculate the summation of the numbers in each row of df, and show the result. (Remark: the result should be a vector of four values)

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