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

Question

我的第一个 hello world 程序无法运行。

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：视图函数映射正在覆盖现有端点函数：index

Answer 1

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AssertionError：视图函数映射正在覆盖现有端点函数：index

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此错误表明您在多个路由中使用了相同的方法名称。

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您可以使用以下代码重现该错误：

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from flask import Flask\n\napp = Flask(__name__)\n\n@app.route("/")\ndef index():\n    return "hello from index"\n\n@app.route("/info")\ndef index():\n    return "hello from info"\n\napp.run(debug=True, port=8080)\n

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错误跟踪：

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(venv) \xe2\x9e\x9c python app.py \nTraceback (most recent call last):\n  File "app.py", line 9, in <module>\n    @app.route("/info", methods=[\'GET\'])\n  File ".../app.py", line 1250, in decorator\n    self.add_url_rule(rule, endpoint, f, **options)\n  File ".../app.py", line 66, in wrapper_func\n    return f(self, *args, **kwargs)\n  File ".../app.py", line 1221, in add_url_rule\n    \'existing endpoint function: %s\' % endpoint)\nAssertionError: View function mapping is overwriting an existing endpoint function: index\n

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两条路线@app.route("/info")都@app.route("/")使用相同的方法，称为index. 所以我收到错误：AssertionError: View function mapping is overwriting an existing endpoint function: index

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我想，你也犯了同样的错误。您正在使用和路线index的方法。//information

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