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GH3 Python WSGI nano framework.

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gh3 Python WSGI nanoframework

if you are not already there, read this doc with API links working
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First App

import gh3

def say_hello(ctx: gh3.Context):
  """A view handler that returns some text."""
  ctx.reply_text('hello, world')

# Create the app, add a route, and start the debug server.
app = gh3.App()
app.add_route('/', say_hello)

Here, we create an instance of gh3.App and we add a simple route to it, and start the debug server.

You can immediately see some features of the request handler:

  • You modify the response in place from the gh3.Context.
  • It is simple to make a simple textual response, using reply_text and there are analogs for reply_html and reply_json. These reply_ methods are shortcuts to setting the response data, the response content-type, and the response status code.


virtualenv -p python3.9 env
./env/bin/pip install gh3

Route handler arguments

Arguments from the route are available in ctx.endpoint_args. They are not passed to the handler functions as all handler functions take only the request context as an argument.

import gh3

def say_hello(ctx: gh3.Context):
  """A view handler that returns some text."""
  user = ctx.endpoint_args['user']
  ctx.reply_text(f'hello, {user}')

# Create the app, add a route, and start the debug server.
app = gh3.App()
app.add_route('/<user>', say_hello)

Routes, targets, and endpoints

As in the simple example above, there is a route '/' and a target, the say_hello function. What is not described there is that the endpoint is inferred from the function name, but can be set explicitly:

app.add_route('/', say_hello, endpoint='home')

The endpoint is used for reverse lookup of URLs.

More complex routing

The entire range of Werkzeug's routing is available by using add_rule and add_target. For example, to use Werkzeug's Submount rule factory, you should create the rule and add the target handlers manually.

rule = gh3.wz_routing.Submount(
    Rule('/', endpoint='blog/index'),
    Rule('/entry/<entry_slug>', endpoint='blog/show')

app.add_target('blog/index', my_blog_index_handler)
app.add_target('blog/show', my_blog_show_handler)


I love Werkzeug, but I really don't love Flask (sorry, Armin). I swear I have used Flask a lot, in big production applications that serve billions of pages a year. There are patterns in Flask that have made it extremely hard for me to develop as part of a large (30+) engineering team, and these are the things intentionally left out of gh3. gh3 will never be as featured as Flask, and that's OK too. You'll forgive me these few 100 lines of well-tested code. And if you are still wondering why, please feel free to move on.

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