Исправлен .gitignore: пакет stylometry/features добавлен в репозиторий

lab1/stylometry/features/characters.py

@@ -0,0 +1,38 @@
+"""Символьные признаки: частоты букв, регистр, цифры, пунктуация."""
+
+from __future__ import annotations
+
+import string
+
+import pandas as pd
+
+from .base import safe_div
+
+
+def extract(row: pd.Series) -> dict[str, float]:
+    text = str(row.get("text", ""))
+    lower = text.lower()
+    letters = [char for char in lower if "a" <= char <= "z"]
+    n_letters = max(len(letters), 1)
+    n_chars = max(len(text), 1)
+
+    features: dict[str, float] = {}
+    for char in string.ascii_lowercase:
+        features[f"char_freq_{char}"] = safe_div(letters.count(char), n_letters)
+
+    upper = sum(1 for char in text if char.isupper())
+    digits = sum(1 for char in text if char.isdigit())
+    spaces = sum(1 for char in text if char.isspace())
+    punctuation = sum(1 for char in text if not char.isalnum() and not char.isspace())
+    features.update(
+        {
+            "char_letter_count": float(len(letters)),
+            "char_upper_rate": safe_div(upper, n_letters),
+            "char_digit_rate": safe_div(digits, n_chars),
+            "char_space_rate": safe_div(spaces, n_chars),
+            "char_punctuation_rate": safe_div(punctuation, n_chars),
+            "char_apostrophe_rate": safe_div(text.count("'"), n_chars),
+            "char_quote_rate": safe_div(text.count('"'), n_chars),
+        }
+    )
+    return features