Ch 5 & 6 practice problems and solutions

1_beginner/chapter4/practice/temperature.py

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+"""
+Hoppity the Rabbit wrote some code, but it doesn't run correctly and he needs your help!
+The following program is supposed to print a string based on a numerical input of the temperature. 
+See if you can fix it for him!
+"""
+#I added some comments to aid you. Good luck! - Hoppity
+temp = int(input("Enter temperature: ")) #possible input range is 0-100
+
+if(temp < 100): #60-100 is hot
+    print('hot')
+if(temp <= 60): #30-59 is normal
+    print('normal')
+if(temp < 30): #0-29 is cold
+    print('cold')

1_beginner/chapter4/solutions/menu.py

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+food = input("Enter food order: ")
+drink = input("Enter drink order: ")
+price = 1000000000
+if(food == 'french toast' and drink == 'coffee'):
+    price = price - 1
+elif(food == 'chicken soup' or drink == 'apple juice'):
+    price = price + 1
+
+print('The total price is $' + str(price))

1_beginner/chapter4/solutions/monthandday.py

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+month = input('Enter the month: ')
+day = input('Enter the day: ')
+
+if(month == 10 and day == 31):
+    print('Boo!')
+elif(month == 4 and day == 1):
+    print('April fools!')
+

1_beginner/chapter4/solutions/square.py

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+x = int(input("Enter a number: "))
+if(x % 2 == 0):
+    print(x**2)
+else:
+    print(x)

1_beginner/chapter4/solutions/temperature.py

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+temp = int(input("Enter temperature: ")) #possible input range is 0-100
+
+if(60 <= temp <= 100): #60-100 is hot
+    print('hot')
+if(30 <= temp < 60): #30-59 is normal
+    print('normal')
+if(0 <= temp < 30): #0-29 is cold
+    print('cold')
+
+#alternatively, you can also use elif

1_beginner/chapter4/solutions/walk.py

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+first_hour = int(input('Enter the hour of the time of the first walk: '))
+first_minute = int(input('Enter the minute of the time of the first walk: '))
+
+second_hour = first_hour + 1 + 6 #add first_hour + 1 is when the first walk ends, 6 hours later the second walk should start
+second_minute = first_minute
+
+current_hour = int(input('Enter the current hour: '))
+current_minute = int(input('Enter the current minute: '))
+
+if(current_hour > second_hour):
+    print('Late')
+elif(current_hour < second_hour):
+    print('Early')
+else: #current_hour == second_hour
+    if(current_minute > second_minute):
+        print('Late')
+    elif(current_minute < second_minute):
+        print('Early')
+    else: #current_minute == second_minute
+        print('Now')

1_beginner/chapter5/practice/virtual_pet.py

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+"""
+Virtual Pet
+Code a virtual pet!
+First, create three variables:  name, hunger, and happiness. 
+Initialize hunger to 6 and happiness to 0, and set name to whatever you like. (e.g. 'Otto')
+Make a program that satisfies the following:
+    Print "[pet name] is hungry" when hunger is above 5, where [pet name] is the name variable.
+    Print "[pet name] wants more attention"  when happiness is below 5.
+    Print "[pet name] feels happy" when hunger is equal to or less than 5, and happiness is equal to or greater than 5.
+    Takes input from the user.
+    If the user enters 'feed', decrease hunger by 2. Increase by 1 otherwise.
+    If the user enters 'pet', increase happiness by 2. Decrease by 1 otherwise.
+    If the user enters 'quit', end the program.
+"""

1_beginner/chapter5/solutions/virtual_pet.py

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+"""
+Virtual Pet
+Code a virtual pet!
+First, create three variables:  name, hunger, and happiness. 
+Initialize hunger to 6 and happiness to 0, and set name to whatever you like. (e.g. 'Otto')
+Make a program that satisfies the following:
+    Print "[pet name] is hungry" when hunger is above 5, where [pet name] is the name variable.
+    Print "[pet name] wants more attention"  when happiness is below 5.
+    Print "[pet name] feels happy" when hunger is equal to or less than 5, and happiness is equal to or greater than 5.
+    Takes input from the user.
+    If the user enters 'feed', decrease hunger by 2. Increase by 1 otherwise.
+    If the user enters 'pet', increase happiness by 2. Decrease by 1 otherwise.
+    If the user enters 'quit', end the program.
+"""
+
+name = 'Otto'
+hunger = 6
+happiness = 0
+
+cmd = input('> ')
+while(cmd != 'quit'):         #Exits loop when user quits
+    if(cmd == 'feed'):
+        hunger -= 2           #Otto is fed, hunger decreases
+        happiness -= 1        #Otto is not pet, happiness decreases
+    elif(cmd == 'pet'):
+        happiness += 2        #Otto is pet, happiness increases
+        hunger += 1           #Otto is not fed, hunger increases
+    if(hunger > 5):           #Otto is not fed enough
+        print(name + ' is hungry')
+    if(happiness < 5):        #Otto is not pet enough
+        print(name + ' wants more attention')
+    elif(hunger <= 5 and happiness >= 5):   #Otto is satisfied!
+        print(name + ' feels happy')
+    cmd = input('> ')         #Keep taking user input until user quits
+
+# Feel free to customize your virtual pet by changing the how much the hunger and happiness variables increase and decrease, or add more actions!

1_beginner/chapter6/examples/too_long

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+"""
+Print and remove all elements in a given list with length greater than 4.
+"""
+#example list to help you test your code
+the_list = ['dragon', 'cab', 'science', 'dove', 'lime', 'river', 'pop']

1_beginner/chapter6/integer_info.py

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+"""
+Integer Info
+Create a program that takes an integer as input and creates a list with the following elements:
+    The number of digits
+    The last digit
+    A 'True' boolean value if the number is even, 'False' if odd
+Print the list. 
+Some examples are given to help check your work.
+"""
+
+#Example 1: The input 123456 should print [6, 6, True]
+#Example 2: The input 101202303 should print [9, 3, False]

1_beginner/chapter6/integer_info_sol.py

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+"""
+Integer Info
+Create a program that takes an integer as input and creates a list with the following elements:
+    The number of digits
+    The last digit
+    A 'True' boolean value if the number is even, 'False' if odd
+Print the list. 
+Some examples are given to help check your work.
+"""
+#Example 1: The input 123456 should print [6, 6, True]
+#Example 2: The input 101202303 should print [9, 3, False]
+
+num = int(input())  #convert string input to int
+print([len(str(num)), num % 10, (num % 2 == 0)]) #taking the modulo of 10 of any number will return its last digit

1_beginner/chapter6/monty_hall.py

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+"""
+Monty Hall
+Code the classic Monty Hall problem!
+The following is a description of the Monty Hall Problem:
+    There are three closed doors, 2 have goats behind them, only one has a car behind it.
+    You don't know which door has what. The goal is to pick the door that has the car behind it.
+    After you make a choice, Monty (the host) opens a door that you did not choose, revealing a goat. 
+    You are then asked whether you want to change your choice to the other door.
+    The door you chose is more likely to have a car if you switch to the other door, apparantly!
+More step-by-step instructions are commented below.
+Read more about the Monty Hall Problem here: (https://betterexplained.com/articles/understanding-the-monty-hall-problem/)
+"""
+#Make the Monty Hall game repeat 6 times.
+
+#Make a list that represents the three closed doors, 'G' for the doors that have a goat, 'C' for the door that has a car.
+#This step has already been done for you.
+import random
+monty_hall = ['G', 'G', 'C']
+
+random.shuffle(monty_hall) #The shuffle function from the random module randomizes the doors every loop
+
+#The user enters their 1st choice.
+
+#A door that has a goat is revealed, cannot be the one user chose
+
+#The user is prompted to choose again
+
+#The prize behind the user's ultimate choice is revealed!

1_beginner/chapter6/monty_hall_sol.py

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+"""
+Monty Hall
+Code the classic Monty Hall problem!
+The following is a description of the Monty Hall Problem:
+    There are three closed doors, 2 have goats behind them, only one has a car behind it.
+    You don't know which door has what. The goal is to pick the door that has the car behind it.
+    After you make a choice, Monty (the host) opens a door that you did not choose, revealing a goat. 
+    You are then asked whether you want to change your choice to the other door.
+    The door you chose is more likely to have a car if you switch to the other door, apparantly!
+More step-by-step instructions are commented below.
+Read more about the Monty Hall Problem here: (https://betterexplained.com/articles/understanding-the-monty-hall-problem/)
+"""
+#Make a list that represents the three closed doors, 'G' for the doors that have a goat, 'C' for the door that has a car.
+import random
+monty_hall = ['G', 'G', 'C']
+
+#Make the Monty Hall game repeat 6 times.
+for i in range(6):
+    random.shuffle(monty_hall)
+    #The user enters their 1st choice
+    choice = input("Choose from doors 1, 2, and 3... : ")
+    #A door that has a goat is revealed, cannot be the one user chose
+    reveal = list(monty_hall)               #makes a duplicate list to avoid messing up the original
+    reveal[int(choice) - 1] = '-'           #removes user's choice so that it won't be opened, but keeps in the element to not mess up the indices
+    print("Monty opens door " + str(reveal.index('G') + 1) + " to reveal a goat!")
+    #The user is prompted to choose again
+    choice = input("Re-enter your choice. You have the option to switch to the other door.\n> ")
+    print("You got... ")
+    #The prize behind the user's ultimate choice is revealed!
+    if(monty_hall[int(choice) - 1] == 'C'):
+        print("a car! Congratulations!")
+    else:
+        print("a goat! Better luck next time!")
+
+    input("Type anything to play again\n> ")

1_beginner/chapter6/snookle_game.py

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+"""
+Snookle Game
+Snookle the sheep wants to play a game. 
+Given a list of positive integers and a main number, the player iterates 
+through each element in the list and chooses to either add it or 
+to subtract it from the current main number. 
+This is done by having the user enter either 'add' or 'subtract' every turn.
+The main number will be updated to the new value.
+A player wins if they make 12 to be the main number.
+If the end of the list is reached, go back to the first element 
+in the list and keep going until the player wins.
+Code the game for Snookle! 
+"""
+
+#example values to get you started
+nums = [3,1,4,2,6,5,8,10]
+main = 7

1_beginner/chapter6/snookle_game_sol.py

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+"""
+Snookle Game
+Snookle the sheep wants to play a game. 
+Given a list of positive integers and a main number, the player iterates 
+through each element in the list and chooses to either add it or 
+to subtract it from the current main number. 
+This is done by having the user enter either 'add' or 'subtract' every turn.
+The main number will be updated to the new value.
+A player wins if they make 12 to be the main number.
+If the end of the list is reached, go back to the first element 
+in the list and keep going until the player wins.
+Code the game for Snookle! 
+"""
+
+nums = [3,1,4,2,6,5,8,10]
+main = 7
+
+choice = ''
+win = False       #The game keeps going until this variable is set to True
+
+while (not win): 
+    for i in nums:
+        print('main number is currently ' + str(main)) #this is optional, but it's easier for the players since they won't have to keep track of the math
+        choice = input("[add] or [subtract] " + str(i) + "?\n> ") #text is also optional, I just added it to make it more user-friendly
+        if(choice == 'add'):  #The user chooses to add
+            main += i         #update main value
+        elif(choice == 'subtract'): #The user chooses to subtract
+            main -= i         #update main value
+        if(main == 12):       #If the main number if 12, the user has won!
+            win = True        #This will make the program exit out of the while loop, thus ending the game
+            break             #This takes us out of the for loop and straight to the while statement
+
+print('Congrats you won the game!')

1_beginner/chapter6/too_long.py

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+"""
+Too Long
+Print and remove all elements in a given list with length greater than 4.
+"""
+#list to help you test your code
+the_list = ['dragon', 'cab', 'science', 'dove', 'lime', 'river', 'pop']

1_beginner/chapter6/too_long_sol.py

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+"""
+Too Long
+Print and remove all elements in a given list with length greater than 4.
+"""
+the_list = ['dragon', 'cab', 'science', 'dove', 'lime', 'river', 'pop']
+
+for x in the_list:  #iterates through every element in the_list
+    if(len(x) > 4): #if length is greater than 4
+        print(x)    #print it
+        the_list.remove(x)