Week 04 assignments

.gitignore

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+
+.vscode/settings.json

answer_1/answer_1.py

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+import string
+import os
+
+all_letters = string.ascii_letters
+
+current_path = os.path.dirname(os.path.realpath(__file__))
+file_path = os.path.join(current_path, "letters.txt")       # The path to the result file
+
+# take user input, only accept integers between 1 and 52
+while True:
+    try:
+        num_of_letters_in_line = int(input(f"How many letters in a line? [between 1 and {len(all_letters)}] "))
+        assert 0 < num_of_letters_in_line <= len(all_letters)
+        break
+    except ValueError:
+        print("Error: not an integer!")
+    except AssertionError:
+        print(f"Error: not between 1 and {len(all_letters)}")
+
+# write the letters to the file
+with open(file_path, "w") as f:    
+    for i in range(0, len(all_letters), num_of_letters_in_line):
+        f.writelines(all_letters[i:i+num_of_letters_in_line] + '\n')
+

answer_1/letters.txt

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+abc
+def
+ghi
+jkl
+mno
+pqr
+stu
+vwx
+yzA
+BCD
+EFG
+HIJ
+KLM
+NOP
+QRS
+TUV
+WXY
+Z

answer_2/answer_2.py

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+import string
+import os
+
+current_path = os.path.dirname(os.path.realpath(__file__))
+folder_path = os.path.join(current_path, "text_files")
+
+# Create a folder if it does not exist
+if not os.path.exists(folder_path):
+    os.mkdir(folder_path)
+os.chdir(folder_path)
+
+# Create a file for each letter in the alphabet
+for letter in string.ascii_uppercase:
+    open(f"{letter}.txt", "w").close()
+

answer_3/answer_3.py

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+import math
+
+
+def lcm(*numbers):
+    ''' A recursive function to find the least common multiple of a list of numbers. '''
+    if len(numbers) == 2:
+        # the LCM of two numbers: LCM(a, b) = a * b / gcd(a, b)
+        return int(numbers[0] * numbers[1]/ math.gcd(numbers[0], numbers[1]))
+    else:
+        # the LCM of the first number and the LCM of the rest of the numbers
+        return lcm(numbers[0], lcm(*numbers[1:]))
+
+
+numbers = []
+# ask the user to enter 4 numbers, only accept integers
+while len(numbers) < 4:
+    try:
+        numbers.append(int(input("Enter a number: ")))
+    except ValueError:
+        print("Error: Not a number! Try again.")
+
+# calculate the least common multiple of the 4 numbers
+print(f"L.C.M of {numbers} is: {lcm(*numbers)}")

answer_4/answer_4.py

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+import os
+import sys
+
+current_path = os.path.dirname(os.path.realpath(__file__))
+operations_directory = os.path.join(current_path, 'operations_functions\\')
+sys.path.append(operations_directory)   # Adds the operations_functions directory to the Python path
+
+# Imports the functions from the operations_functions directory
+import add_function, sub_function, multiply_function, divide_function
+
+def input_and_check(prompt, accepted_inputs, error_prompt='Error: Invalid input!'):
+    ''' A function to check if the user input is in the accepted inputs. Returns the input if it is accepted. Otherwise, repeat.'''
+    while True:
+        input_string = input(prompt)
+        try:
+            if accepted_inputs == 'numbers':     # if the accepted input is a number (float)
+                return float(input_string)
+            else:
+                assert input_string in accepted_inputs
+                return input_string
+        except:
+            print(error_prompt)
+
+
+# The main loop
+while True:
+    number_1 = input_and_check('Enter first number: ', 'numbers', 'Error: Input must be a float value!')
+    operation = input_and_check('Choose an operation: [+, -, *, /]: ', ['+', '-', '*', '/'], 'Error: Invalid operation! Try again.')
+    number_2 = input_and_check('Enter second number: ', 'numbers', 'Error: Input must be a float value!')
+
+    if operation == '+':
+        print(f'{number_1} + {number_2} = {add_function.add(number_1, number_2)}')
+    elif operation == '-':
+        print(f'{number_1} - {number_2} = {sub_function.sub(number_1, number_2)}')
+    elif operation == '*':
+        print(f'{number_1} * {number_2} = {multiply_function.multiply(number_1, number_2)}')
+    elif operation == '/':
+        print(f'{number_1} / {number_2} = {divide_function.divide(number_1, number_2)}')
+
+    if input_and_check('Do you want to continue? (Y/N): ', ['Y', 'y', 'N', 'n']) in ['N', 'n']:
+        break
+

answer_4/operations_functions/add_function.py

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+import math
+
+def add(a, b):
+    return math.ceil(a + b)

answer_4/operations_functions/divide_function.py

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+from decimal import DivisionByZero
+import math
+
+def divide(a, b):
+    try:
+        return math.ceil(a / b)
+    except ZeroDivisionError:
+        return "Cannot divide by zero"
+

answer_4/operations_functions/multiply_function.py

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+import math
+
+def multiply(a, b):
+    return math.ceil(a * b)

answer_4/operations_functions/sub_function.py

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+import math
+
+def sub(a, b):
+    return math.ceil(a - b)