fix: use explicit encoding="utf-8" for all file I/O so Windows users avoid cp1252 crashes (#543, #550, #576)

tradingagents/__init__.py

@@ -1,2 +0,0 @@
-import os
-os.environ.setdefault("PYTHONUTF8", "1")

tradingagents/dataflows/stockstats_utils.py

@@ -67,7 +67,7 @@ def load_ohlcv(symbol: str, curr_date: str) -> pd.DataFrame:
     )
 
     if os.path.exists(data_file):
-        data = pd.read_csv(data_file, on_bad_lines="skip")
+        data = pd.read_csv(data_file, on_bad_lines="skip", encoding="utf-8")
     else:
         data = yf_retry(lambda: yf.download(
             symbol,
@@ -78,7 +78,7 @@ def load_ohlcv(symbol: str, curr_date: str) -> pd.DataFrame:
             auto_adjust=True,
         ))
         data = data.reset_index()
-        data.to_csv(data_file, index=False)
+        data.to_csv(data_file, index=False, encoding="utf-8")
 
     data = _clean_dataframe(data)
 

tradingagents/dataflows/utils.py

@@ -8,7 +8,7 @@ SavePathType = Annotated[str, "File path to save data. If None, data is not save
 
 def save_output(data: pd.DataFrame, tag: str, save_path: SavePathType = None) -> None:
     if save_path:
-        data.to_csv(save_path)
+        data.to_csv(save_path, encoding="utf-8")
         print(f"{tag} saved to {save_path}")