Step 1

Picking a random word and checking answers

src/hangman/game.py

@@ -0,0 +1,27 @@
+"""!
+@file game.py
+@brief Game logic for Hangman, kept free of input/output so it can be tested.
+"""
+
+import random
+
+from hangman.constants import WORD_LIST
+
+
+def choose_word(words: list[str] | None = None) -> str:
+    """!
+    @brief Pick a random word.
+    @param words Candidate words; defaults to the built-in word list.
+    @return The chosen word in lower case.
+    """
+    return random.choice(words if words is not None else WORD_LIST).lower()
+
+
+def is_in_word(word: str, letter: str) -> bool:
+    """!
+    @brief Check whether a guessed letter occurs in the word.
+    @param word The secret word.
+    @param letter The guessed letter (case-insensitive).
+    @return True if @p letter is in @p word.
+    """
+    return letter.lower() in word.lower()