updating type hint for solutions

02-IDE_exercises/solutions/02b-project/temp_conversion.py

@@ -5,8 +5,8 @@
 
 print("Please enter the temperature in Celsius.")
 
-temp_c = float(input())
-temp_f = (9/5) * temp_c + 32
+temp_c: float = float(input())
+temp_f: float = (9/5) * temp_c + 32
 
 print("The corresponding temperature in Fahrenheit is:")
 print(temp_f)

02-IDE_exercises/solutions/02c-project/coin_change.py

@@ -2,20 +2,22 @@
 # Date: 09/24/2020
 # Description: Asks the user for int  of cents less than $1 and returns
 #              breakout of coin denominations with fewest number of coins
+# Hint: the floor division // could be useful where it rounds the result down to the nearest whole number
+# or the modulo operator can also be used.
 
 print("Please enter an amount between 0 and 99 cents.")
 
-coins = int(input())
+coins: int = int(input())
 
 print("Your change will be:")
 
-quarters = coins // 25
+quarters: int = coins // 25
 coins -= quarters * 25
-dimes = coins // 10
+dimes: int = coins // 10
 coins -= dimes * 10
-nickels = coins // 5
+nickels: int = coins // 5
 coins -= nickels * 5
-pennies = coins
+pennies: int = coins
 
 print("Q:", quarters)
 print("D:", dimes)

02-IDE_exercises/solutions/03a-project/min_max_number.py

@@ -4,26 +4,26 @@
 #              integers from user
 
 print("How many numbers would you like to enter?")
-num_int = int(input())
+num_int: int = int(input())
 # The first while loop ensures that the user enters at least one number
 # if, the user enters anything less than 1, it will prompt the user to enter something greater than one
 
 while num_int < 1:
     print("Please enter at least one number")
-    num_int = int(input())
+    num_int: int = int(input())
 else:
     print("Please enter", num_int, "numbers.")
 
-    first_int = int(input())
+    first_int: int = int(input())
     #  the first number is the largest as well as the smallest number
-    min = first_int
-    max = first_int
+    min: int = first_int
+    max: int = first_int
 
     # if the number of ints requested by user is greater than one, we'll initialize
     # a while loop
 
     while num_int > 1:
-        n = int(input())
+        n = int(input())  # type: int
         if n < min:
             min = n
         if n > max:

02-IDE_exercises/solutions/03b-project/find_factors.py

@@ -2,9 +2,9 @@
 # Date: 10/05/2020
 # Description: Take in positive integer and print list of factors
 
-integer = int(input("Please enter a positive integer:"))
+integer: int = int(input("Please enter a positive integer:"))
 print("The factors of", integer, "are:")
 
-for i in range(1, integer+1):
+for i in range(1, integer + 1):  # type: int
     if integer % i == 0:
-        print(i)
+        print(i)

02-IDE_exercises/solutions/03c-project/guess_num.py

@@ -1,15 +1,15 @@
 # Author: Brandon Hoffman
 # Date: 10/05/2020
-# Description: Guessing game that takes a number to guess and has user contiously 
+# Description: Guessing game that takes a number to guess and has user continuously
 #              make guesses till they get the answer correct
 
 print("Enter the number for the player to guess.")
-solution = int(input())
+solution: int = int(input())
 
 print("Enter your guess.")
-guess = int(input())
+guess: int = int(input())
 
-number_of_guesses = 1
+number_of_guesses: int = 1
 
 while guess != solution:
     if guess > solution:
@@ -19,8 +19,6 @@
         print("Too low - try again:")
         guess = int(input())
 
-    number_of_guesses += 1
-
-number_of_guesses +=1
+number_of_guesses += 1
 
 print("You guessed it in", number_of_guesses, "tries.")

02-IDE_exercises/solutions/04a-project/distance_fallen.py

@@ -3,10 +3,14 @@
 # Description: created a function called "fall_distance() that takes an input of seconds and returns
 #              the distance an object has fallen."
 
+time: float = int(input("Please enter an amount of time in second(s): "))
 
-def fall_distance(t):
-    '''takes input in seconds and returns distance object has fallen'''
-    g = 9.8 # velocity
 
-    return 0.5 * g * t*t
+def fall_distance(t) -> float:
+    """takes input in seconds and returns distance object has fallen"""
+    g: float = 9.8  # velocity
 
+    return 0.5 * g * t * t
+
+
+print("The distance the object has fallen is : ", fall_distance(time), "meter:")

02-IDE_exercises/solutions/04b-project/fibonacci.py

@@ -1,18 +1,21 @@
-# Author: Brandon Hoffman
-# Date: 10/17/2020
-# Description: created a function called fib() that calculate a fibonnaci number for a given 'n' without recursion or the golden ratio.
+# Author: Brandon Hoffman Date: 10/17/2020 Description: created a function called fib() that calculate a Fibonacci
+# number for a given 'n' without recursion or the golden ratio.
 
-def fib(n):
-    '''calculate a fibonnaci number given the input 'n' without recursion using the golden ratio'''
 
-    prev_num = 0
-    curr_num = 1
-    sol = 1
-    for i in range(n-1):
+def fib(n) -> int:
+    """calculate a fibonnaci number given the input 'n' without recursion using the golden ratio"""
+
+    prev_num: int = 0
+    curr_num: int = 1
+    sol: int = 1
+    print("The numbers in fibonacci series are : ")
+    for i in range(n - 1):
         sol = curr_num + prev_num
         prev_num = curr_num
         curr_num = sol
-
-
+        print(sol)
     return sol
 
+
+number: int = int(input("Please enter a number to calculate its Fibonacci number: "))
+print("The Fibonacci number is: ", fib(number))

02-IDE_exercises/solutions/04c-project/hailstone_step.py

@@ -4,17 +4,20 @@
 #              same process until the result terminates at a value of 1.
 
 
-def hailstone(n):
-    '''takes an integer, 'n' and if even divides by 2 and if odd multiples by 3 and adds 1
-       the result continues until the value reaches 1 and the function terminates and returns the count the number of steps'''
-    count = 0
-    while n != 1:
+def hailstone(n) -> int:
+    """takes an integer, 'n' and if even divides by 2 and if odd multiples by 3 and adds 1 the result continues until
+    the value reaches 1 and the function terminates and returns the count the number of steps """
+    count: int = 0
+    while n != 1:  # type: bool
         print(count, n)
         if n % 2 == 0:
             n //= 2
         else:
             n = (n * 3) + 1
-            
+
         count += 1
+    return count
+
 
-    return count
+number: int = int(input("Please enter a number: "))
+print("The count is: ", hailstone(number))

02-IDE_exercises/solutions/05a-project/multiply_recur.py

@@ -3,11 +3,16 @@
 # Description: write a function that uses recursive iteration to multiply two positive integers
 #              with addition
 
-def multiply(multiplier, multiplicand):
+def multiply(multiplier, multiplicand) -> int:
     """
     Takes in two positive integers and multiplies them by recursively adding the int multiplicand int multiplier times.
     """
     if multiplier == 1:
         return multiplicand
     else:
-        return multiply(multiplier-1, multiplicand) + multiplicand
+        return multiply(multiplier - 1, multiplicand) + multiplicand
+
+
+multiplier: int = int(input("Please enter a multiplier: "))
+multiplicand: int = int(input("Please enter a multiplicand: "))
+print("The result is: ", multiply(multiplier, multiplicand))

02-IDE_exercises/solutions/05b-project/Taxicab.py

@@ -7,7 +7,7 @@ class Taxicab:
     """
     Represents a taxicab that tracks the distance traveled when given x and y coordinates
     """
-    def __init__(self, x, y):
+    def __init__(self, x, y) -> None:
         """
         Creates a taxicab object with x and y coordiantes and intializes an odometer to 0
         """
@@ -16,32 +16,32 @@ def __init__(self, x, y):
 
         self._odometer = 0
 
-    def get_x_coord(self):
+    def get_x_coord(self) -> float:
         """
         returns the current x coordinate
         """
         return self._x
 
-    def get_y_coord(self):
+    def get_y_coord(self) -> float:
         """
         returns the current y coordinate
         """
         return self._y
 
-    def get_odometer(self):
+    def get_odometer(self) -> float:
         """
         sums the abs value of the change in x and y coordinates
         """
         return self._odometer
 
-    def move_x(self, x_vector):
+    def move_x(self, x_vector) -> None:
         """
         takes in a one-dimensional vector and adds it to the x coordiante as its original value and the odometer as an absolute value
         """
         self._x += x_vector
         self._odometer += abs(x_vector)
 
-    def move_y(self, y_vector):
+    def move_y(self, y_vector) -> None:
         """
         takes in a one-dimensional vector and adds it to the x coordiante as its original value and the odometer as an absolute value
         """

02-IDE_exercises/solutions/05b-project/test.py

@@ -0,0 +1,7 @@
+from Taxicab import Taxicab
+
+cab = Taxicab(3, -8)       # creates a Taxicab object at coordinates (3, -8)
+cab.move_x(4)              # moves cab 4 units "right"
+cab.move_y(-5)             # moves cab 5 units "down"
+cab.move_x(-2)             # moves cab 2 unit "left"
+print(cab.get_odometer())  # prints the current odometer reading

02-IDE_exercises/solutions/06a-project/find_median.py

@@ -1,19 +1,24 @@
 # Author: Brandon Hoffman
 # Date: 10/25/2020
 # Description: Sorts a list of numbers and returns the median number in the list
+from array import array
 
-def find_median(some_nums):
+
+def find_median(some_nums) -> float:
     """
     Sorts a list of numbers and returns the median value
     """
     some_nums.sort()
     array_length = len(some_nums)
 
-    mid_index = int(array_length/2)
+    mid_index = int(array_length / 2)
 
     if array_length % 2 == 0:
-        mid_index_alt = int((array_length/2)-1)
+        mid_index_alt = int((array_length / 2) - 1)
         return (some_nums[mid_index] + some_nums[mid_index_alt]) / 2
     else:
         return some_nums[mid_index]
-
+
+
+list_of_nums: list[int] = [13, 7, -3, 82, 4]
+result = find_median(list_of_nums)

02-IDE_exercises/solutions/06b-project/add_surname.py

@@ -1,9 +1,21 @@
-# Author: Brandon Hoffman
-# Date: 10/25/2020
-# Description: create a function that takes a list of names and stores any value that starts with the letter 'K' in a new list concatenated also with the string ' Hoffman'
+# Author: Brandon Hoffman Date: 10/25/2020 Description: create a function that takes a list of names and stores any
+# value that starts with the letter 'K' in a new list concatenated also with the string ' Hoffman'
 
-def add_surname(name_list):
+def add_surname(name_list) -> list[str]:
     """
-    takes a list of names and stores any value that starts with the letter 'K' in a new list concatenated also with the string ' Hoffman'
+    takes a list of names and stores any value that starts with the letter 'K' in a new list concatenated also with
+    the string ' Hoffman'
     """
-    return [name + " Hoffman" for name in name_list if name[0] == "K"]
+    new_name_list: list[str] = []
+    for name in name_list:
+        if name[0] == 'K':
+            new_name_list += [name + ' Hoffman']
+
+    return new_name_list
+
+
+# testing the function
+names: list[str] = ["Kiki", "Krystal", "Pavel", "MaryKay", "Annie", "Koala"]
+changed_name_lists: list[str] = add_surname(names)
+for name in changed_name_lists:
+    print(name)

02-IDE_exercises/solutions/06c-project/std_dev.py

@@ -1,6 +1,6 @@
 # Author: Brandon Hoffman
 # Date: 10/25/2020
-# Description: Creates a Person class to intialize a name and age.
+# Description: Creates a Person class to initialize a name and age.
 #              Then creates a std_dev function that can take a list of person
 #              objects and calculate a standard deviation on the age
 
@@ -9,21 +9,21 @@ class Person:
     Represents a person
     """
 
-    def __init__(self, name, age):
+    def __init__(self, name, age) -> None:
         """
         Intializes a person's name and age
         """
         self._name = name
         self._age = age
 
-    def get_age(self):
+    def get_age(self) -> int:
         """
         returns the age of a person object
         """
         return self._age
-
 
-def std_dev(person_list):
+
+def std_dev(person_list) -> float:
     """
     Takes in a list of 'Person' objects and returns the standard deviation of their ages
     """
@@ -35,8 +35,15 @@ def std_dev(person_list):
 
     variance = 0
     for person in person_list:
-        variance += (person.get_age() - avg)**2
+        variance += (person.get_age() - avg) ** 2
+
+    stdv = (variance / len(person_list)) ** 0.5
+
+    return stdv
 
-    stdv = (variance / len(person_list))**0.5
 
-    return stdv
+person1 = Person("Katie", 73)
+person2 = Person("Tran", 24)
+person3 = Person("Hanna", 48)
+person_list: list[Person] = [person1, person2, person3]
+print(std_dev(person_list))