我最近购买了RealPython来学习Python和web开发。但是,我遇到了一个路障,我认为这是机器上的Python配置问题。任何帮助都将不胜感激。
所以我有一个名为app.py的Flask文档,类似于RealPython's github app.py
# --- Flask Hello World ---#
# import the Flask class from the flask module
from flask import Flask
# create the application object
app = Flask(__name__)
# use decorators to link the function to a url
@app.route("/")
@app.route("/hello")
# define the view using a function, which returns a string
def hello_world():
return "Hello, World!"
# dynamic route
@app.route("/test/<search_query>")
def search(search_query):
return search_query
# dynamic route with an int type
@app.route("/integer/<int:value>")
def type(value):
print value + 1
return "correct"
# dynamic route with an float type
@app.route("/float/<float:value>")
def type(value):
print value + 1
return "correct"
# dynamic route that accepts slashes
@app.route("/path/<path:value>")
def type(value):
print value
return "correct"
# start the development server using the run() method
if __name__ == "__main__":
app.run()
很遗憾,我在尝试运行应用程序时收到此错误:
machine:flask-hello-world machine$ source env/bin/activate
(env)machine:flask-hello-world machine$ python app.py
Traceback (most recent call last):
File "app.py", line 29, in <module>
@app.route("/float/<float:value>")
File "/Volumes/disk2/Home/Library/RealPython/flask-hello-world/env/lib/python2.7/site-packages/flask/app.py", line 1013, in decorator
self.add_url_rule(rule, endpoint, f, **options)
File "/Volumes/disk2/Home/Library/RealPython/flask-hello-world/env/lib/python2.7/site-packages/flask/app.py", line 62, in wrapper_func
return f(self, *args, **kwargs)
File "/Volumes/disk2/Home/Library/RealPython/flask-hello-world/env/lib/python2.7/site-packages/flask/app.py", line 984, in add_url_rule
'existing endpoint function: %s' % endpoint)
AssertionError: View function mapping is overwriting an existing endpoint function: type
Pip freeze将这些作为virtualenvenv
的要求。Python2.7就是安装的。
Flask==0.10.1
Jinja2==2.7.3
MarkupSafe==0.23
Werkzeug==0.9.6
itsdangerous==0.24
wsgiref==0.1.2
唯一能让代码运行的方法是更改def类型。不过,人们不应该这样做。。。
# dynamic route with an int type
@app.route("/integer/<int:value>")
def type(value):
print value + 1
return "correct"
# dynamic route with an float type
# change to type1 so dev server will spool up
@app.route("/float/<float:value>")
def type1(value):
print value + 1
return "correct"
# dynamic route that accepts slashes
# change to type2 so dev server will spool up
@app.route("/path/<path:value>")
def type2(value):
print value
return "correct"
所以,您找到了解决方案:这是一个名称空间问题。您有三个相互冲突的函数-
def type
。当您使用不同的名称重命名它们时,这解决了问题。顺便说一下,我是Real Python的作者。正在更正。
干杯!
你的三种方法同名。包装器使用方法的名称来进行映射
可以让多个贴图指向同一方法:
不应将方法命名为
type
,因为它是内置类型类的名称:相关问题 更多 >
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