Flask 动态路由不起作用 - 真正的 Python

Question

I'm working through RealPython and I'm having trouble with the flask dynamic route.

Everything seemed to work until the dynamic route. Now if I try to enter a "search query" (ie localhost:5000/test/hi) the page is not found. localhost:5000 still works fine.

# ---- 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!"

# start the development server using the run() method
if __name__ == "__main__":
    app.run()


# dynamic route
@app.route("/test/<search_query>")
def search(search_query):
    return search_query

I can't see that other people using RealPython have had an issue with the same code, so I'm not sure what I'm doing wrong.

Answer 1

The reason why this is not working is because flask never learns that you have another route other / and /hello because your program gets stuck on app.run() .

If you wanted to add this, all you need to do would be to add the new route before calling app.run() like so:

# ---- 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

# start the development server using the run() method
if __name__ == "__main__":
    app.run(host="0.0.0.0", debug=True, port=5000)

Now this will work.

Note: You don't need to change the run configurations inside of app.run . You can just use app.run() without any arguments and your app will run fine on your local machine.

Answer 2

尝试使用整个 URL 而不仅仅是 IP 地址。