Chapter 4 Exercises

1. There are 3 syntax errors in the following code. Fix it to print correctly without errors. It will print, “Your name is Carly and your favorite color is red”.

   color = "red' name = 'Carly' print("Your name is " + name + and your favorite color is" + color + ".")

   Change "red' to "red". Add an " before and your favorite. Add a space after is.

   color = "red" name = 'Carly' print("Your name is " + name + " and your favorite color is " + color + ".")

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2. Fix the syntax errors so it prints “My name is Sam and I am 12 years old.”

   name = Sam age = 12 print("My name is name and I am" + age + "years old".)

   Sam must be a string because otherwise it’s a variable. Age must be converted to a string.

   name = "Sam" age = 12 print("My name is " + name +" and I am " + str(age) + " years old.")

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3. You will get an error if you try to run the following code. Fix the code to print correctly without errors. It should print, “Your name is Carly and your age is 5.”

   age = 5 name = 'Carly' print("Your name is" + name + "and your age is" + age + ".")

   Change age to str(age).

   age = 5 name = 'Carly' print("Your name is " + name + " and your age is " + str(age) + ".")

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4. Using the variables given, modify the print statement to print "A car travelling at 70 mph takes 2 hours to go 140 miles."

   milesPerHour = 70 distanceTravelled = 140 timeTaken = milesPerHour / distanceTravelled print(timeTaken)

   milesPerHour = 70 distanceTravelled = 140 timeTaken = milesPerHour / distanceTravelled print("A car travelling at " + str(milesPerHour) + " mph takes " + str(timeTaken) + "hours to go " + str(distanceTravelled) + " miles.")

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5. There are 3 syntax errors in the following code. Fix it to print correctly without errors. It will print your name and age.

   age = input("How old are you?") name = input ("What is your first name?") print ("Your name is " + Name " and you are " age "years old.")

   Change Name to name. Add a + at the end of line 3. Add a + before and after age in line 4.

   age = input("How old are you?") name = input ("What is your first name?") print ("Your name is " + name + " and you are " + age + " years old.")

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6. Fix the syntax errors so that the code prints “The apple costs $5”.

   fruit = apple price = 5 print("The" fruit "costs $" + "price")

   Fix as shown below.

   fruit = "apple" price = 5 print("The " + fruit + " costs $" + str(price))

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7. Modify line 6 to print: “The number of miles you can drive on 25 dollars is 273.97260274.”

   funds = 25 milesPerGallon = 40 pricePerGallon = 3.65 numGallons = funds / pricePerGallon numMiles = milesPerGallon * numGallons print(numMiles)

   See line 6 below. Be sure to use str(num) to convert a number to a string.

   funds = 25 milesPerGallon = 40 pricePerGallon = 3.65 numGallons = funds / pricePerGallon numMiles = milesPerGallon * numGallons print("The number of miles you can drive on " + str(funds) + " dollars is " + str(numMiles) + ".")

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8. Complete the code so that only “giant alligator” is printed.

   sentence = "There is a giant alligator over there." s1 = print(s1)

   You only want the substring from character 11 to character 26, but remember the stop sequence isn’t inclusive.

   sentence = "There is a giant alligator over there." s1 = sentence[11:27] print(s1)

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9. Modify line 6 to print: “You can order 40.0 wings when you have 5 people who can each spend 4 dollars and wings cost 0.5 each.”

   numPeople = 5 amountPerPerson = 4 price = 0.5 total = numPeople * amountPerPerson numWings = total / price print(numWings)

   Change line 6 to include strings that explain the value that was calculated. Be sure to use str(num) to convert a number to a string.

   numPeople = 5 amountPerPerson = 4 price = 0.5 total = numPeople * amountPerPerson numWings = total / price print("You can order " + str(numWings) + " wings" + " when you have " + str(numPeople) + " people" + " who can each spend " + str(amountPerPerson) + " dollars" + " and wings cost " + str(price) + " each.")

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10. Fix the code so that only “meow” is printed.

    sentence = "The cat goes meow." s2 = [16:13]sentence print(s2)

    Change line 2 to the proper syntax order for getting a substring, and change the start-stop bounds to 13 to 17.

    sentence = "The cat goes meow." s2 = sentence[13:17] print(s2)

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11. Combine lines 4 and 5 in the code below to print: “270 is 4.0 hours and 30 minutes.”

    totalMinutes = 270 numMinutes = totalMinutes % 60 numHours = (totalMinutes - numMinutes) / 60 print(numHours) print(numMinutes)

    Combine lines 4 and 5 and use + to append strings. Use str(num) to convert a number to a string so that it can be appended.

    totalMinutes = 270 numMinutes = totalMinutes % 60 numHours = (totalMinutes - numMinutes) / 60 print(str(totalMinutes) + " is " + str(numHours) + " hours and " + str(numMinutes) + " minutes.")

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12. Complete the code on lines 3 and 4 so that it prints “2” and then “22”.

    sentence = "This is his wish." sentence2 = "His only wish is this." pos = .find("is") length = len( ) print(length)

    Line 3 should find “is” in sentence and line 4 should find the length of sentence 2

    sentence = "This is his wish." sentence2 = "His only wish is this." pos = sentence.find("is") length = len(sentence2) print(length)

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13. Complete the calculations on lines 2 and 4 and enter the items to be printed on line 5 to print the number of miles you can drive if you have a 10 gallon gas tank and are down to a quarter of a tank of gas and your car gets 32 miles per gallon. It should print: “You can go 80.0 miles.”

    tankCapacity = 10 numGallons = milesPerGallon = 32 numMiles = print()

    Calculate numGallons as tankCapacity * 0.25. Calculate numMiles as numGallons * milesPerGallon. Use concatenation to print out an explanation and the value. Be sure to use str(num) to convert a number to a string before you concatenate it.

    tankCapacity = 10 numGallons = tankCapacity * 0.25 milesPerGallon = 32 numMiles = numGallons * milesPerGallon print("You can go " + str(numMiles) + " miles.")

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14. Fix line 2 so that it prints “Hi” instead of “hi”.

    s1 = "hi" s1.capitalize() print(s1)

    You have to assign s1.capitalize() to s1 to reflect the change

    s1 = "hi" s1 = s1.capitalize() print(s1)

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15. Write code to get the name of a color from the user using the input function. Next convert the name of the color to all lowercase letters and print it.

    Use input("message") to get the color. Use the lower() function to get the string as all lowercase letters.

    color = input("Enter an color.") colorLower = color.lower() print("The color is " + colorLower)

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16. Write code to get the input of a user’s first name, then get only the first letter of their name, and print that letter lowercase.

    Get the user input and get the substring of only the first character.

    name = input("What is your first name") firstInitial = name[0:1] print(firstInitial)

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17. Write the code below to calculate and print how many months it will take to save $200 if you earn $20 a week. It should print: “It will take 2.5 months to earn 200 if you make 20 dollars a week.”

    Name each of the values. Calculate the totalWeeks it will take and the months and print the information.

    goal = 200 weeklyEarning = 20 totalWeeks = goal / weeklyEarning months = totalWeeks / 4 print("It will take " + str(months) + " months to earn " + str(goal) + " if you make " + str(weeklyEarning) + " dollars a week.")

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18. Write code to print out the statement “Hi my name is Bob and I am 2” using only string methods or string slicing. You must get every part of the new string from the given strings.

    s1 = "hi" s2 = "My namesake is Bob, and he and I love to eat ham."

    Use string slicing to get all the words and get the length of s1 to get the number 2. Use methods like capitalize() and lower() to convert cases.

    s1 = "hi" s2 = "My namesake is Bob, and he and I love to eat ham." s3 = s1.capitalize() s4 = s2[0:7].lower() s5 = s2[12:18] s6 = s2[31:33] s7 = s2[46:48] s8 = len(s1) print(s3 + " " + s4 + " " + s5 + " " + s6 + s7 + " " + str(s8))

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19. Write code below to get at least 3 values from the user using the input function and output a mad lib (which will use the input to tell a silly story).

    Use input("message") to get the input. Use string concatenation to print the mad lib.

    place = input("Enter the name of a place.") verb = input("Enter a verb.") action = input("Enter an action.") color = input("Enter your favorite color.") animal = input("What is your favorite animal?") print("Once upon a time in " + place + ", I was " + verb + "ing and I " + action + " because a " + color + " " + animal + " was also " + verb + "ing.")

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20. Write code that gets user input and print a string that states their input in all lowercase and gives the length of their string.

    Use the lower and length methods on the user input. Don’t forget to convert the length to a string.

    user = input("Type a sentence") user = user.lower() length = len(user) print("The length of " + user + " is" + str(length))

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