Step 2

Replacing blanks with guesses

README.md

@@ -16,14 +16,16 @@ A beginner-friendly Python program that lets you play Hangman in the terminal ag
 
 Day 7 of Udemy's *100 Days of Code™: The Complete Python Pro Bootcamp*. The game is built in five steps that follow the course:
 
-1. Picking a random word and checking answers *(this step)*
+1. Picking a random word and checking answers
-2. Replacing blanks with guesses
+2. Replacing blanks with guesses *(this step)*
 3. Checking if the player has won
 4. Keeping track of the player's lives
 5. Improving the user experience
 
 **Step 1:** the program picks a random word, asks for one letter and tells you whether the letter is in the word.
 
+**Step 2:** the word is shown as blanks (`_ _ _ _ _`). After your guess every matching blank is replaced by the letter.
+
 ## 📋 Requirements
 
 - Python 3.13 or newer

src/hangman/constants.py

@@ -3,6 +3,8 @@
 @brief Constants shared across the Hangman game.
 """
 
+## Character shown for a letter that has not been guessed yet.
+BLANK = "_"
 ## Words the computer picks from.
 WORD_LIST = [
     "aardvark",

src/hangman/game.py

@@ -5,7 +5,7 @@
 
 import random
 
-from hangman.constants import WORD_LIST
+from hangman.constants import BLANK, WORD_LIST
 
 
 def choose_word(words: list[str] | None = None) -> str:
@@ -25,3 +25,36 @@ def is_in_word(word: str, letter: str) -> bool:
     @return True if @p letter is in @p word.
     """
     return letter.lower() in word.lower()
+
+
+class Game:
+    """!
+    @brief State of one Hangman game.
+    """
+
+    def __init__(self, word: str) -> None:
+        """!
+        @brief Start a new game.
+        @param word The secret word.
+        """
+        ## The secret word.
+        self.word = word.lower()
+        ## Letters guessed so far.
+        self.guesses: set[str] = set()
+
+    def guess(self, letter: str) -> bool:
+        """!
+        @brief Process a guess and reveal the letter if it is in the word.
+        @param letter A single letter.
+        @return True if the letter is in the word.
+        """
+        letter = letter.lower()
+        self.guesses.add(letter)
+        return is_in_word(self.word, letter)
+
+    def display(self) -> str:
+        """!
+        @brief The word with unguessed letters replaced by blanks.
+        @return For example `"p _ n g _ i n"`.
+        """
+        return " ".join(c if c in self.guesses else BLANK for c in self.word)

src/hangman/main.py

@@ -3,19 +3,29 @@
 @brief Command-line interface for Hangman.
 """
 
-from hangman.game import choose_word, is_in_word
+from hangman.game import Game, choose_word
+
+
+def say(message: str = "") -> None:
+    """!
+    @brief Show a message to the player; all output goes through here.
+    @param message The text to show.
+    """
+    print(message)
 
 
 def main() -> None:
     """!
-    @brief Entry point: pick a random word and check one guessed letter.
+    @brief Entry point: show the blanks, take one guess and show the result.
     """
-    word = choose_word()
+    game = Game(choose_word())
-    guess = input("Guess a letter: ").strip()
+    say(game.display())
-    if is_in_word(word, guess):
+    letter = input("Guess a letter: ").strip()
-        print(f"Right, '{guess.lower()}' is in the word.")
+    if game.guess(letter):
+        say(f"Right, '{letter.lower()}' is in the word.")
     else:
-        print(f"Wrong, '{guess.lower()}' is not in the word.")
+        say(f"Wrong, '{letter.lower()}' is not in the word.")
+    say(game.display())
 
 
 if __name__ == "__main__":

tests/test_game.py

@@ -1,5 +1,5 @@
 from hangman.constants import WORD_LIST
-from hangman.game import choose_word, is_in_word
+from hangman.game import Game, choose_word, is_in_word
 
 
 def test_choose_word_from_list():
@@ -14,3 +14,19 @@ def test_letter_in_word():
 
 def test_letter_not_in_word():
     assert not is_in_word("camel", "z")
+
+
+def test_display_starts_blank():
+    assert Game("cat").display() == "_ _ _"
+
+
+def test_correct_guess_reveals_letters():
+    g = Game("banana")
+    assert g.guess("a") is True
+    assert g.display() == "_ a _ a _ a"
+
+
+def test_wrong_guess_keeps_blanks():
+    g = Game("cat")
+    assert g.guess("z") is False
+    assert g.display() == "_ _ _"

tests/test_main.py

@@ -8,9 +8,16 @@ def run(monkeypatch, capsys, word, letter):
     return capsys.readouterr().out
 
 
-def test_right_guess(monkeypatch, capsys):
+def test_right_guess_fills_blanks(monkeypatch, capsys):
-    assert "Right" in run(monkeypatch, capsys, "camel", "a")
+    out = run(monkeypatch, capsys, "camel", "a")
+    assert out.splitlines() == [
+        "_ _ _ _ _",
+        "Right, 'a' is in the word.",
+        "_ a _ _ _",
+    ]
 
 
-def test_wrong_guess(monkeypatch, capsys):
+def test_wrong_guess_keeps_blanks(monkeypatch, capsys):
-    assert "Wrong" in run(monkeypatch, capsys, "camel", "z")
+    out = run(monkeypatch, capsys, "camel", "z")
+    assert "Wrong" in out
+    assert out.splitlines()[-1] == "_ _ _ _ _"