flask 파일 업로드 문제

[sohyunwriter]

@app.route('/predict', methods=['GET', 'POST'])
def upload():
if request.method=='POST':
f = request.files['file']
file_path = secure_filename('./img/' + f.filename)
print(file_path)
f.save(file_path)

    preds = model_predict(file_path, model)

    pred_class = decode_predictions(preds, top=1)
    result = str(pred_class[0][0][1])
    return result
return None