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diff --git a/数据表/convert.py b/数据表/convert.py
index 4a83ecc..c8a034c 100644
--- a/数据表/convert.py
+++ b/数据表/convert.py
@@ -36,7 +36,12 @@ def convert_excel_to_txt(folder_path='.'):
excel_file = pd.ExcelFile(file_path)
valid_sheets = []
for sheet_name in excel_file.sheet_names:
- df = pd.read_excel(excel_file, sheet_name=sheet_name, header=None)
+ df = pd.read_excel(
+ excel_file,
+ sheet_name=sheet_name,
+ header=None,
+ keep_default_na=False,
+ )
if is_valid_sheet(df):
valid_sheets.append((sheet_name, df))