fix linting errors

lightrag/utils.py

@@ -16,9 +16,7 @@ import numpy as np
 import tiktoken
 
 from lightrag.prompt import PROMPTS
-from typing import List
-import csv
-import io
+
 
 class UnlimitedSemaphore:
     """A context manager that allows unlimited access."""
@@ -237,16 +235,14 @@ def truncate_list_by_token_size(list_data: list, key: callable, max_token_size:
     return list_data
 
 
-
-
 def list_of_list_to_csv(data: List[List[str]]) -> str:
     output = io.StringIO()
     writer = csv.writer(
         output,
-        quoting=csv.QUOTE_ALL,       # Quote all fields
-        escapechar='\\',             # Use backslash as escape character
-        quotechar='"',               # Use double quotes
-        lineterminator='\n'          # Explicit line terminator
+        quoting=csv.QUOTE_ALL,  # Quote all fields
+        escapechar="\\",  # Use backslash as escape character
+        quotechar='"',  # Use double quotes
+        lineterminator="\n",  # Explicit line terminator
     )
     writer.writerows(data)
     return output.getvalue()
@@ -254,16 +250,16 @@ def list_of_list_to_csv(data: List[List[str]]) -> str:
 
 def csv_string_to_list(csv_string: str) -> List[List[str]]:
     # Clean the string by removing NUL characters
-    cleaned_string = csv_string.replace('\0', '')
-    
+    cleaned_string = csv_string.replace("\0", "")
+
     output = io.StringIO(cleaned_string)
     reader = csv.reader(
         output,
-        quoting=csv.QUOTE_ALL,       # Match the writer configuration
-        escapechar='\\',             # Use backslash as escape character
-        quotechar='"',               # Use double quotes
+        quoting=csv.QUOTE_ALL,  # Match the writer configuration
+        escapechar="\\",  # Use backslash as escape character
+        quotechar='"',  # Use double quotes
     )
-    
+
     try:
         return [row for row in reader]
     except csv.Error as e: