[Edu-sig] Simplest webapps

Sat Mar 31 20:16:51 EDT 2018

Bottle is a single file web microframework.

https://github.com/bottlepy/bottle
https://github.com/bottlepy/bottle/blob/master/bottle.py

> Example: "Hello World" in a bottle

```python
from bottle import route, run, template

@route('/hello/<name>')
def index(name):
    return template('<b>Hello {{name}}</b>!',
        name=name)

run(host='localhost', port=8080)
```

There are docs and every function is Ctrl-F'able within bottle.py.

On Friday, March 30, 2018, kirby urner <kirby.urner at gmail.com> wrote:

>
> Very interesting.  I note that free users are relegated to Python 2.7
>
> Server modules can be Python 3.6 (outside the free version)
>
> Client stuff compiles to JavaScript and is approximately 2.7
>
> That's a bit confusing maybe.  I try to avoid 2.7 but that's not easy.
>
> In my Coding with Kids work, we use Codesters.com to teach Python, which
> depends on Skulpt.  Also 2.x ish.
>
> Kirby
>
>
>
> On Fri, Mar 30, 2018 at 11:49 AM, Jason Blum <jason.blum at gmail.com> wrote:
>
>> http://anvil.works/ is a pretty interesting approach to Python web
>> applications.
>>
>> On Fri, Mar 30, 2018 at 2:05 PM, kirby urner <kirby.urner at gmail.com>
>> wrote:
>>
>>>
>>> Hi Aivar --
>>>
>>> I think it's a fine idea to write simple Python scripts that write HTML
>>> files, which you may then pull up in the browser.
>>>
>>> There's no need to put a server behind static web pages.  So, for
>>> example, I'll have my students write a page of bookmarks:
>>>
>>> # -*- coding: utf-8 -*-
>>> """
>>> Created on Wed Nov  4 18:02:30 2015
>>>
>>> @author: Kirby Urner
>>> """
>>>
>>> # tuple of tuples
>>> bookmarks = (
>>>     ("Anaconda.org", "http://anaconda.org"),
>>>     ("Python.org", "http://python.org"),
>>>     ("Python Docs", "https://docs.python.org/3/"),
>>>     ("Spaghetti Code", "http://c2.com/cgi/wiki?SpaghettiCode"),
>>>     ("Structured Programming", "http://c2.com/cgi/wiki?Struct
>>> uredProgramming"),
>>>     ("Map of Languages", "http://archive.oreilly.com/pu
>>> b/a/oreilly//news/languageposter_0504.html"),
>>>     ("XKCD", "http://xkcd.com"),
>>>     )
>>>
>>> page = '''\
>>> <!DOCTYPE HTML>
>>> {}
>>> '''
>>>
>>> html = """\
>>> <HTML>
>>> <HEAD>
>>> <TITLE>Bookmarks for Python</TITLE>
>>> </HEAD>
>>> <BODY>
>>> <H3>Bookmarks</H3>
>>> <BR />
>>> <UL>
>>> {}
>>> </UL>
>>> </BODY>
>>> </HTML>
>>> """.lower()
>>>
>>> the_body = ""
>>> for place, url in bookmarks:
>>>     the_body += "<li><a href='{}'>{}</a></li>\n".format(url, place)
>>>
>>> webpage = open("links.html", "w")
>>> print(page.format(html.format(the_body)), file=webpage)
>>> webpage.close()
>>>
>>> All you need add to your example is using print() to save to a file, so
>>> the browser has something to open.
>>>
>>> I would not call this a "web app" yet it's instructive in showing how
>>> Python can write HTML files.
>>>
>>> Kirby
>>>
>>>
>>>
>>> On Wed, Mar 28, 2018 at 12:18 AM, Aivar Annamaa <aivar.annamaa at ut.ee>
>>> wrote:
>>>
>>>> Hi!
>>>> Let's say my students are able to write programs like this:
>>>>
>>>> name = input("name")
>>>>
>>>> if name == "Pete":
>>>>     greeting = "Hi"
>>>> else:
>>>>     greeting = "Hello!"
>>>>
>>>> print(f"""
>>>> <html>
>>>> <body>
>>>> {greeting} {name}!
>>>> </body>
>>>> </html>
>>>> """)
>>>>
>>>> I'd like to allow them start writing web-apps without introducing
>>>> functions first (most web-frameworks require functions).
>>>>
>>>> It occurred to me that it's not hard to create a wrapper, which
>>>> presents this code as a web-app (input would be patched to look up GET
>>>> or POST parameters with given name).
>>>>
>>>> This approach would allow simple debugging of the code on local machine
>>>> and no extra libraries are required in this phase.
>>>>
>>>> Any opinions on this? Has this been tried before?
>>>>
>>>> best regards,
>>>> Aivar
>>>>
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>>>>
>>>>
>>>
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>
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