Add input validation, error handling, and search comparison loop

.gitignore

@@ -0,0 +1,3 @@
+__pycache__/
+*.pyc
+*.pyo

binary_search.py

@@ -24,6 +24,13 @@
 # But we can make this *faster* by leveraging the fact that our array is sorted!
 # Binary search ~ O(log(n)), naive search ~ O(n)
 
+def get_valid_integer(prompt):
+    while True:
+        try:
+            return int(input(prompt))
+        except ValueError:
+            print("Invalid input. Please enter an integer.")
+
 # In these two examples, l is a list in ascending order, and target is something that we're looking for
 # Return -1 if not found
 
@@ -66,26 +73,50 @@ def binary_search(l, target, low=None, high=None):
         return binary_search(l, target, midpoint+1, high)
 
 if __name__=='__main__':
-    # l = [1, 3, 5, 10, 12]
-    # target = 7
-    # print(naive_search(l, target))
-    # print(binary_search(l, target))
-
-    length = 10000
-    # build a sorted list of length 10000
-    sorted_list = set()
-    while len(sorted_list) < length:
-        sorted_list.add(random.randint(-3*length, 3*length))
-    sorted_list = sorted(list(sorted_list))
-
-    start = time.time()
-    for target in sorted_list:
-        naive_search(sorted_list, target)
-    end = time.time()
-    print("Naive search time: ", (end - start), "seconds")
-
-    start = time.time()
-    for target in sorted_list:
-        binary_search(sorted_list, target)
-    end = time.time()
-    print("Binary search time: ", (end - start), "seconds")
+    try:
+        length = 10000
+        # build a sorted list of length 10000
+        sorted_list = sorted(random.sample(range(-3*length, 3*length), length))
+
+        print("Search conducted in repository: kying18/beginner-projects\n")
+        print("A sorted list of random integers has been generated.")
+        print("You will continue entering numbers until one is found in the list.\n")
+        while True:
+            target = get_valid_integer("Enter a number to search for: ")
+            result = binary_search(sorted_list, target)
+
+            if result != -1:
+                print(f"Target {target} found at index {result}.")
+
+                # Time comparison between naive and binary search
+                start = time.time()
+                naive_search(sorted_list, target)
+                end = time.time()
+                naive_time = end - start
+
+                start = time.time()
+                binary_search(sorted_list, target)
+                end = time.time()
+                binary_time = end - start
+
+                print(f"Naive search time: {naive_time:.8f} seconds")
+                print(f"Binary search time: {binary_time:.8f} seconds")
+                print("Binary search is faster due to its O(log n) complexity.\n")
+            else:
+                print(f"Target {target} not found in the list.")
+
+            # Ask if the user wants to continue comparing searches
+            while True:
+                choice = input("\nWould you like to continue comparing searches? (y/n): ").strip().lower()
+                if choice in ['y', 'yes']:
+                    print("\nContinuing search...\n")
+                    break # exit inner loop, continue outer loop
+                elif choice in ['n', 'no']:
+                    print("\nExiting program. Thank you for using the search comparison tool.")
+                    raise SystemExit
+                else:
+                    print("Invalid input. Please enter 'Y' or 'N'.")
+
+    except Exception as e:
+        print(f"An unexpected error occurred: {e}")
+

login.py

@@ -8,29 +8,87 @@
 Website: https://www.kylieying.com
 Github: https://www.github.com/kying18 
 Programmer Beast Mode Spotify playlist: https://open.spotify.com/playlist/4Akns5EUb3gzmlXIdsJkPs?si=qGc4ubKRRYmPHAJAIrCxVQ 
-"""
 
+How to run:
+    python login.py
+
+Credentials are read from environment variables (no plaintext secrets in code):
+    export LOGIN_USERNAME=kylie
+    export LOGIN_PASSWORD=secretpassword
+
+If either variable is not set, the script will print instructions and exit.
+"""
+import getpass
+import os
+import sys
+# Time module offers time values, timestamps, delays, 
+# and performance measurements. 
 import time
 
-username = 'kylie'
-password = 'secretpassword'
+# login function for more modularity.
+# expected_username and expected_password receive the credentials at call time.
+# username_input_fn and password_input_fn can be replaced in unit tests
+# to avoid interactive prompts.
+def login(expected_username, expected_password,
+          username_input_fn=input, password_input_fn=getpass.getpass):
+    # Two user inputs for Username and Password
+    username_input = username_input_fn('Username: ')
+    password_input = password_input_fn('Password: ')
+    # if user input (Username) is exact to defined username variable and
+    # if user input (Password) is exact to defined password variable
+    # proceed with if statement.
+    if username_input == expected_username and password_input == expected_password:
+        print('Access granted')         # Print shown statements with pauses inbetween
+        print('Please wait')
+        time.sleep(5)                   # Pause program execution for 5 seconds
+        print('Ok... Loading...')
+        time.sleep(1)                   # Pause program execution for 1 second
+        print('...')
+        time.sleep(1)                   # Pause program execution for 1 second
+        print('...')                    # Gain access to "secret mainframe"
+        print('Alright you have security clearance. Pulling up the secret mainframe.')
+    # else if statement for incorrect password input prints Password incorrect.
+    elif username_input == expected_username and password_input != expected_password:
+        print('Password incorrect')
+    # else if statement for incorrect username input prints Username incorrect.
+    elif username_input != expected_username and password_input == expected_password:
+        print('Username incorrect')
+    # else (lastly) let user know username and password are incorrect.
+    else:
+        print('You might wanna check both fields...')
 
-username_input = input('Username: ')
-password_input = input('Password: ')
+def main(username, password):
+    # Introduction to secret mainframe to identify username and
+    # password.
+    print("==============================================") 
+    print(" WELCOME TO THE ASTRAL MAINFRAME v3.7") 
+    print("==============================================") 
+    time.sleep(1) 
+    print("\nBefore you lies a terminal rumored to guard the") 
+    print("ancient secrets of the digital realm. Only those") 
+    print("who can decipher the clues may enter.") 
+    time.sleep(2) 
+    print("\nA whisper echoes from the machine:") 
+    print('"The key is hidden in plain sight… if you can') 
+    print(' read between the lines, you already know."') 
+    time.sleep(3) 
+    print("\nA faint note appears on the screen:") 
+    print(" - The guardian favors a name that starts with 'k' and ends with 'ylie'.") 
+    print(" - The password? Well… some say it's the most *secret* thing of all.") 
+    time.sleep(3) 
+    print("\nType the credentials to prove your worth.\n")
+    login(username, password)
 
-if username_input == username and password_input == password:
-    print('Access granted')
-    print('Please wait')
-    time.sleep(5)
-    print('Ok... Loading...')
-    time.sleep(1)
-    print('...')
-    time.sleep(1)
-    print('...')
-    print('Alright you have security clearance. Pulling up the secret mainframe.')
-elif username_input == username and password_input != password:
-    print('Password incorrect')
-elif username_input != username and password_input == password:
-    print('Username incorrect')
-else:
-    print('You might wanna check both fields...')
+# Execute program
+if __name__ == "__main__":
+    # Load credentials from environment variables (no plaintext secrets in source).
+    # Verify they are set before starting the interactive session.
+    _username = os.environ.get('LOGIN_USERNAME')
+    _password = os.environ.get('LOGIN_PASSWORD')
+    if not _username or not _password:
+        print("Error: credentials not configured.")
+        print("Please set the LOGIN_USERNAME and LOGIN_PASSWORD environment variables:")
+        print("  export LOGIN_USERNAME=<your_username>")
+        print("  export LOGIN_PASSWORD=<your_password>")
+        sys.exit(1)
+    main(_username, _password)