Solution Manual for Intro to Python for Computer Science and Data Science: Learning to Program with AI, Big Data and The Cloud, 1st Edition

PyCDS_02_IntroToPython.fm Page 1 Tuesday, May 21, 2019 11:16 AM Introduction to Python Programming 2 Objectives In this chapter, you’ll: ■ Continue using IPython interactive mode to enter code snippets and see their results immediately. ■ Write simple Python statements and scripts. ■ Create variables to store data for later use. ■ Become familiar with built-in data types. ■ Use arithmetic operators and comparison operators, and understand their precedence. ■ Use single-, double- and triplequoted strings. ■ Use built-in function print to display text. ■ Use built-in function input to prompt the user to enter data at the keyboard and get that data for use in the program. ■ Convert text to integer values with built-in function int. ■ Use comparison operators and the if statement to decide whether to execute a statement or group of statements. ■ Learn about objects and Python’s dynamic typing. ■ Use built-in function type to get an object’s type. PyCDS_02_IntroToPython.fm Page 2 Tuesday, May 21, 2019 11:16 AM 2 Introduction to Python Programming Note: Throughout the Instructor Solutions Manual, solutions are not provided for project, research and challenge exercises—many of which are substantial and appropriate for term projects, directed-study projects, capstone-course projects and thesis topics. Before assigning a particular exercise for homework, instructors should check the IRC to be sure the solution is available. These Instructor Solutions Manual PDFs contain only answers to short-answer exercises and any discussion questions asked in other exercises. Code corresponding to programming exercises can be found in the solutions folder’s chapter-specific subfolder—e.g., ch01 for Chapter1, ch02 for Chapter 2, etc. Code generally is provided both in Python source-code files (.py) and Jupyter Notebooks (.ipynb). Exercises Unless specified otherwise, use IPython sessions for each exercise. (What does this code do?) Create the variables x = 2 and y = 3, then determine what each of the following statements displays: a) print(‘x =’, x) Answer: x = 2 b) print(‘Value of’, x, ‘+’, x, ‘is’, (x + x)) Answer: Value of 2 + 2 is 4 c) print(‘x =’) Answer: x = d) print((x + y), ‘=’, (y + x)) Answer: 5 = 5 2.1 2.2 (What’s wrong with this code?) The following code should read an integer into the variable rating: rating = input(‘Enter an integer rating between 1 and 10’) Answer: Function input returns a string, so to get an integer, you’d have to use: rating = int(input(‘Enter an integer rating between 1 and 10’)) 2.3 (Fill in the missing code) Replace *** in the following code with a statement that will print a message like ‘Congratulations! Your grade of 91 earns you an A in this course’. Your statement should print the value stored in the variable grade: if grade >= 90: *** Answer: if grade >= 90: print(‘Congratulations! Your grade of’, grade, ‘earns you an A in this course’) © Copyright 2020 by Pearson Education, Inc. All Rights Reserved,