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python-csi160/week06/croce_week6_lab.py

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+# Charlotte Croce
+# CSI 160
+# Week 6: Lab - Loops
+# 2/17/25
+
+# 1. Area Codes
+# Given a list of phone numbers that are missing the area code, 
+# append the area code to the phone numbers in the list and return the result list.
+
+def add_area_code(phone_numbers, area_code):
+    """Returns a list of phone numbers with the area code added.
+    Given a list of phone numbers that are missing the area code,
+    append the area code to the phone numbers in the list and return the result list.
+
+    :param phone_numbers: (list) A list of phone numbers (strings) that do not have the area code
+                                Example: ['555-1212']
+    :param area_code: (str) The area code to add Example: '802'
+    :return: (list) A list of phone numbers with the area code Example: ['802-555-1212']
+    """
+    phone_numbers_with_area = phone_numbers.copy()
+    for i in range(len(phone_numbers_with_area)):
+        phone_numbers_with_area[i] = area_code + '-' + phone_numbers[i]
+    return phone_numbers_with_area
+
+# example usage
+phone_numbers = ['555-1212', '999-0738']
+with_area_code = add_area_code(phone_numbers, '802')
+print(with_area_code)
+
+################################################################
+# 2. Print even numbers
+# Complete the following function to print the even numbers of a list, one per line.
+
+def print_even(numbers):
+    """Prints the even numbers in a list, one per line
+
+    :param numbers: (list) list of integers
+    :return: None
+    """
+    for number in numbers:
+        if number % 2 == 0:
+            print(number)
+ 
+print_even([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
+
+
+################################################################
+# 3. Guessing Game
+# Extend your guessing game from earlier.  Write a program that picks a random number from 1-100.  Then ask the user to guess a number. 
+# Tell the user if the answer is higher or lower than the number they guessed, or if they got the correct answer. 
+# Allow them to guess again if they got the guess incorrect.  They should be able to guess numbers an infinite number 
+# of times until they get the correct answer, at which point your loop will end.
+
+# To generate a number from 1-100 you will need the following code at the beginning of your program:
+
+from random import randint
+
+def guessing_game():
+    """Plays a guessing game where the user guesses a number between 1 and 100
+
+    :return: None
+    """
+    randomNum = randint(1, 100)
+    while True:
+        guess = int(input("Guess a number 1-100: "))
+        if guess < randomNum:
+            print("Higher")
+        elif guess > randomNum:
+            print("Lower")
+        else:
+            print("Correct!")
+            break
+
+guessing_game()
+
+################################################################
+#4. Backpack of Stuff
+#Complete the following code. Fill in the two sections of code identified in the comments.
+
+import sys
+
+def backpack_of_stuff():
+    """Allows user to add and check items in a backpack
+
+    :return: None
+    """
+    itemsInBackpack = ["book", "computer", "keys", "travel mug"]
+
+    while True:
+        print("Would you like to:")
+        print("1. Add an item to the backpack?")
+        print("2. Check if an item is in the backpack?")
+        print("3. Quit")
+        userChoice = input()
+    
+        if(userChoice == "1"):
+            print("What item do you want to add to the backpack?")
+            itemToAdd = input()
+            itemsInBackpack.append(itemToAdd)
+        
+        if(userChoice == "2"):   
+            print("What item do you want to check to see if it is in the backpack?")
+            itemToCheck = input()
+            if itemToCheck in itemsInBackpack:
+                print("yes, this item is in backpack")
+            else:
+                print("no, this item is not in backpack")
+    
+        if(userChoice == "3"): 
+            #sys.exit()
+            break
+
+backpack_of_stuff()
+
+################################################################
+# 5. Comma Code
+# Say you have a list value like this:
+
+# listToPrint = ['apples', 'bananas', 'tofu', 'cats']
+#Write a program that prints a list with all the items separated by a comma and a space, 
+# with and inserted before the last item. For example, the above list would print 'apples, bananas, tofu, and cats'. 
+# But your program should be able to work with any list not just the one shown above.
+# Because of this, you will need to use a loop in case the list to print is shorter or longer than the above list. 
+# Do not modify the list by inserting 'and' into the list and do not simply print the entire list 
+# (you must loop through printing each item individually). This problem is trickier than it appears at first glance.
+
+def comma_code(listToPrint):
+    """Prints a list with all the items separated by a comma and a space, with 'and' inserted before the last item
+
+    :param listToPrint: (list) A list of strings
+    :return: None
+    """
+    
+    # cases for list being 2, 1, or 0 elements
+    if len(listToPrint) == 0:
+        print("List is empty")
+        return
+    elif len(listToPrint) == 1:
+        print(listToPrint[0])
+        return
+    elif len(listToPrint) == 2:
+        print(listToPrint[0] + " and " + listToPrint[1])
+        return
+    
+    else:
+        for i in range(len(listToPrint) - 1): # loop through all but last element
+            print(listToPrint[i], end=", ")
+        print("and " + listToPrint[-1]) #print final element of list
+
+comma_code(['apples', 'bananas', 'tofu', 'cats', 'dogs'])

python-csi160/week06/week6practiceproblems/part1.py

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+#1 initialize the loop
+x = int(input('What number do you want to start at? '))
+
+# Print countdown using while loop with one number per line
+while x > 0:
+    print(x)
+    x -= 1

python-csi160/week06/week6practiceproblems/part2.py

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+a = int(input('What number do you want to start at? '))
+b = int(input('What number do you want to end at? '))
+
+# Print all numbers from a to b inclusively.  Assume (a ≤ b)
+
+while a <= b:
+    print(a)
+    a += 1

python-csi160/week06/week6practiceproblems/part3.py

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+def all_squares(n):
+    """Returns a list that contains all the squares of positive integers
+    where the square is less than or equal to N, in ascending order.
+
+    :param n: (int) Upper bound
+    :return: (list) List of squares
+    """
+    squares = []
+    i = 1
+    while i * i <= n:
+        squares.append(i * i)
+        i += 1
+    return squares
+
+
+# Leave this part for easily testing your function
+print('all_squares(50) returns:', all_squares(50))
+print('all_squares(9) returns:', all_squares(9))

python-csi160/week06/week6practiceproblems/part4.py

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+def introductions(names):
+    """Prints introductions.
+
+    An introduction is 'Hello' followed by a space and a name.
+    Include a newline after each introduction.
+    Example:
+    'Hello Josh'
+
+    Important: Your function should use print() and not have a return statement
+
+    :param names: (list) First Names as strings
+    :return: None
+    """
+    for name in names:
+        print("Hello", name)
+
+
+# Leave this part for easily testing your function
+sample_names = input('Enter the names separated by a comma and a space: ').split(', ')
+introductions(sample_names)
+

python-csi160/week06/week6practiceproblems/part5.py

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+def num_distinct_elements(numbers):
+    """Determine the number of distinct elements in the list
+
+    :param numbers: (list) A list of numbers (int or float)
+    :return: (int) Number of distinct elements
+    """
+    # Use the function sorted() to temporarily sort the numbers
+    # into ascending order or use the method .sort() to permanently
+    # sort the list in ascending order.
+    numbers.sort()
+    unique_numbers = 1
+    for i in range(1, len(numbers)):
+        if numbers[i] != numbers[i - 1]:
+            unique_numbers += 1
+    return unique_numbers
+
+
+
+
+# Leave this part for easily testing your function
+test1 = [2, 5, 5, 7,2, 9.5, 2, 4]
+print(f'num_distinct_elements({test1}) returns:', num_distinct_elements(test1))
+test2 = [2, 1, 1, 7, 1, 9.5, 2, 1]
+print(f'num_distinct_elements({test2}) returns:', num_distinct_elements(test2))
+

python-csi160/week06/week6practiceproblems/part6.py

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+def fibonacci(n):
+    """Return the nth Fibonacci number. 
+
+    param n: (int) position to determine fibonacci of
+    return: (int) value at position n
+    """
+    
+    fib_numbers = [0, 1]
+    for i in range(2, n + 1):
+        fib_numbers.append(fib_numbers[i - 1] + fib_numbers[i - 2])
+    return fib_numbers[n]
+
+# Leave this part for easily testing your function
+print('fibonacci(6) returns:', fibonacci(6), 'expected 8')
+print('fibonacci(3) returns:', fibonacci(3), 'expected 2')