Add missing starter code for Password Strength Checker

starter_code/password_checker.py

@@ -0,0 +1,145 @@
+"""
+Project:    Password Strength Checker
+Difficulty: Beginner
+Skills:     Python, Regex
+Time:       Low (a few hours)
+
+What you will build:
+    A command-line tool that checks the strength of a password based on
+    length, use of uppercase/lowercase letters, numbers, and special symbols.
+    The tool rates each password as Weak, Medium, or Strong.
+
+How to run:
+    python password_checker.py
+
+Learning goals:
+    - Working with Python strings and character classes
+    - Using the re module for pattern matching
+    - Building a simple scoring algorithm
+    - Writing clear user-facing feedback
+
+Roadmap:
+    Step 1:  Project is already set up — run it and explore the menu
+    Step 2:  Complete check_length() to score based on password length
+    Step 3:  Complete check_uppercase() to detect uppercase letters
+    Step 4:  Complete check_lowercase() to detect lowercase letters
+    Step 5:  Complete check_digits() to detect numeric characters
+    Step 6:  Complete check_symbols() to detect special characters
+    Step 7:  Complete evaluate_strength() to combine all scores
+"""
+
+import re
+
+
+# ---------------------------------------------------------------------------
+# Scoring configuration
+# ---------------------------------------------------------------------------
+
+# Each criterion contributes points toward the final strength score
+WEIGHTS = {
+    "length":    2,
+    "uppercase": 2,
+    "lowercase": 1,
+    "digits":    2,
+    "symbols":   3,
+}
+
+# Thresholds for strength labels
+WEAK_THRESHOLD = 4
+STRONG_THRESHOLD = 8
+
+
+# ---------------------------------------------------------------------------
+# Individual checks — complete each function below
+# ---------------------------------------------------------------------------
+
+def check_length(password):
+    """
+    Score based on password length.
+
+    Rules:
+        < 8 characters  -> 0 points
+        8-11 characters -> 1 point
+        12+ characters  -> 2 points
+    """
+    pass
+
+
+def check_uppercase(password):
+    """
+    Return WEIGHTS["uppercase"] if the password contains at least one
+    uppercase letter (A-Z), otherwise return 0.
+    """
+    pass
+
+
+def check_lowercase(password):
+    """
+    Return WEIGHTS["lowercase"] if the password contains at least one
+    lowercase letter (a-z), otherwise return 0.
+    """
+    pass
+
+
+def check_digits(password):
+    """
+    Return WEIGHTS["digits"] if the password contains at least one
+    digit (0-9), otherwise return 0.
+    """
+    pass
+
+
+def check_symbols(password):
+    """
+    Return WEIGHTS["symbols"] if the password contains at least one
+    non-alphanumeric character (e.g. !, @, #, $, %), otherwise return 0.
+    """
+    pass
+
+
+# ---------------------------------------------------------------------------
+# Combined scoring
+# ---------------------------------------------------------------------------
+
+def evaluate_strength(password):
+    """
+    Run all checks, sum the score, and return a tuple:
+        (total_score, label)
+
+    Label is one of: "Weak", "Medium", "Strong"
+
+    Scoring:
+        0-4  -> Weak
+        5-7  -> Medium
+        8-10 -> Strong
+    """
+    pass
+
+
+# ---------------------------------------------------------------------------
+# Main entry point
+# ---------------------------------------------------------------------------
+
+def main():
+    """Prompt the user for a password and display its strength."""
+    print("=" * 40)
+    print("    Password Strength Checker")
+    print("=" * 40)
+
+    password = input("\nEnter a password to check: ")
+
+    score, label = evaluate_strength(password)
+
+    print(f"\nScore: {score}/10")
+    print(f"Strength: {label}")
+
+    if label == "Weak":
+        print("Tip: Use at least 12 characters with uppercase, lowercase, digits, and symbols.")
+    elif label == "Medium":
+        print("Tip: Add more variety — try mixing in symbols and making it longer.")
+    else:
+        print("Great password! It meets all security recommendations.")
+
+
+if __name__ == "__main__":
+    main()