Flask AssertionError:视图函数映射正在覆盖现有端点函数：索引

Question

我的第一个hello world程序不起作用

这是我的代码：

from flask import Flask
app=Flask(__name__)
@app.route('/')
def index():
    return "<h1>Hello world</h1>"

if __name__=='__main__':
        app.run()
 

这是我的输出：

(myflaskenv) C:\Users\saini computers\Desktop\flask_examples>python 
 basic.py
Traceback (most recent call last):
  File "basic.py", line 6, in <module>
    @app.route('/information')
  File "C:\Users\saini computers\Anaconda3\envs\myflaskenv\lib\site- 
  packages\flask\app.py", line 1250, in decorator
    self.add_url_rule(rule, endpoint, f, **options)
  File "C:\Users\saini computers\Anaconda3\envs\myflaskenv\lib\site- 
  packages\flask\app.py", line 66, in wrapper_func
    return f(self, *args, **kwargs)
  File "C:\Users\saini computers\Anaconda3\envs\myflaskenv\lib\site- 
  packages\flask\app.py", line 1221, in add_url_rule
    'existing endpoint function: %s' % endpoint)

AssertionError: View function mapping is overwriting an existing endpoint function: index

Answer 1

AssertionError: View function mapping is overwriting an existing endpoint function: index

此错误表示您在多个路由中使用了相同的方法名称

您可以使用以下代码再现错误：

from flask import Flask

app = Flask(__name__)

@app.route("/")
def index():
    return "hello from index"

@app.route("/info")
def index():
    return "hello from info"

app.run(debug=True, port=8080)

错误跟踪：

(venv) ➜ python app.py 
Traceback (most recent call last):
  File "app.py", line 9, in <module>
    @app.route("/info", methods=['GET'])
  File ".../app.py", line 1250, in decorator
    self.add_url_rule(rule, endpoint, f, **options)
  File ".../app.py", line 66, in wrapper_func
    return f(self, *args, **kwargs)
  File ".../app.py", line 1221, in add_url_rule
    'existing endpoint function: %s' % endpoint)
AssertionError: View function mapping is overwriting an existing endpoint function: index

两条路由@app.route("/info")和@app.route("/")使用名为index的相同方法。所以我得到了错误：AssertionError: View function mapping is overwriting an existing endpoint function: index

我想，你也犯了同样的错误。您正在对/和/information路由使用方法index