Update app.py

app.py

@@ -26,7 +26,7 @@ choices = os.popen('tesseract --list-langs').read().split('\n')[1:-1]
 
 
 # 翻译模型选择
-def model_choice(src, trg):
+def model_choice(src='trans_src', trg='trans_trg'):
     # https://huggingface.co/Helsinki-NLP/opus-mt-tc-big-pt-en
     # https://huggingface.co/Helsinki-NLP/opus-mt-tc-big-en-pt
     model_name = f"Helsinki-NLP/opus-mt-tc-big-{src}-{trg}"  # 模型名称