Adding utility functions for alphabet handling

utils/AlphabetUtils.py

@@ -0,0 +1,21 @@
+LETTERS = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
+		   'W', 'X', 'Y', 'Z']
+
+
+def get_letter_at_index(idx: int, capital: bool = False):
+	if idx < 0 or idx > 25:
+		raise AttributeError
+
+	return LETTERS[idx] if capital else LETTERS[idx].lower()
+
+def get_index_of_letter(letter: str):
+	if letter.upper() not in LETTERS:
+		raise AttributeError
+
+	return LETTERS.index(letter.upper())
+
+
+if __name__ == '__main__':
+	print(get_letter_at_index(25, True))
+	print(get_index_of_letter('ä'))
+