Flask微框架入门指南：官方文档速查

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To run the application you can either use the flask command or python’s -m switch

with Flask. Before you can do that you need to tell your terminal the application to

work with by exporting the FLASK_APP environment variable:

$ export FLASK_APP=hello.py

$ flask run

* Running on http://127.0.0.1:5000/

If you are on Windows you need to use set instead of export.

Alternatively you can use python -m flask:

$ export FLASK_APP=hello.py

$ python -m flask run

* Running on http://127.0.0.1:5000/

This launches a very simple builtin server, which is good enough for testing but prob-

ably not what you want to use in production. For deployment options see Deployment

Options.

Now head over to http://127.0.0.1:5000/, and you should see your hello world greet-

ing.

Externally Visible Server

If you run the server you will notice that the server is only accessible from your own

computer, not from any other in the network. This is the default because in debugging

mode a user of the application can execute arbitrary Python code on your computer.

If you have the debugger disabled or trust the users on your network, you can make

the server publicly available simply by adding --host=0.0.0.0 to the command line:

flask run --host=0.0.0.0

This tells your operating system to listen on all public IPs.

4.2 What to do if the Server does not Start

In case the python -m flask fails or flask does not exist, there are multiple reasons

this might be the case. First of all you need to look at the error message.

4.2.1 Old Version of Flask

Versions of Flask older than 0.11 use to have different ways to start the application. In

short, the flask command did not exist, and neither did python -m flask. In that case

you have two options: either upgrade to newer Flask versions or have a look at the

Development Server docs to see the alternative method for running a server.

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