FLASK报错，TypeError，需要valid response

今日继续调试abstract的flask框架项目，遇到这样的报错。

TypeError
TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.

源代码如下：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

from app import app from flask import render_template,request import sys sys.path.append('examples') sys.path.append('src') import testrun @app.route('/') @app.route('/index') #def index(): #    return render_template('index.html', title='请您输入') @app.route('/index',methods=['GET','POST']) def index():     input_text=''     output_text=''     if request.method == 'POST':         print('post')         # 接收数据         input_text=request.form.get('input_text')         with open('data/test_news.txt', 'w', encoding='utf=8') as f:             f.writelines(input_text)         output_text=testrun.test( )         print(output_text)         return render_template('index.html',title='文本摘要结果', input_text=input_text,abstract_text=output_text)

　　

 

 

后来，看到另外一篇文章
Flask 使用过程
被route()装饰器所装饰的functions()必须有返回值
from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
'Hello World!' # 没有关键字return

if __name__ == '__main__':
app.run()
TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.
受到启示，函数必须有返回值！
把return语句的缩进位置调整一下，

?

1 2 3 4 5 6 7 8 9 10 11 12

def index():     input_text=''     output_text=''     if request.method == 'POST':         print('post')         # 接收数据         input_text=request.form.get('input_text')         with open('data/test_news.txt', 'w', encoding='utf=8') as f:             f.writelines(input_text)         output_text=testrun.test( )         print(output_text)     return render_template('index.html',title='文本摘要结果', input_text=input_text,abstract_text=output_text)

　　

终于不再报错。特此记录，以供以后参考。