[PYTHON] pyramid tutorial notes (single_file_tasks)

single_file_tasks Make a note of what you learned in the tutorial.

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• I added a list of completed tasks and a function to send back completed tasks.

file organization

main processing

    #Declaration
    settings = {}
    settings['reload_all'] = True
    settings['debug_all'] = True
    settings['mako.directories'] = os.path.join(here, 'templates')
    settings['db'] = os.path.join(here, 'tasks.db')
    #Create session. session is cookie based.(document.You can check it with a cookie.)
    session_factory = UnencryptedCookieSessionFactoryConfig('itsaseekreet')

    #Pour settings into pyramid
    config = Configurator(settings=settings, session_factory=session_factory)
    #Path setting
    config.add_route('list', '/')
    config.add_route('new', '/new')
    config.add_route('close', '/close/{id}')
    #Specifying a static path
    config.add_static_view('static', os.path.join(here, 'static'))
    #Decorator (@view_config and@Find subscriber) and add it to the settings
    config.scan()

    #web server settings
    app = config.make_wsgi_app()
    server = make_server('0.0.0.0', 8080, app)
    server.serve_forever()

pyramid.events.subscriber

Example

• @subscriber(NewRequest)

Requests are executed first for requests. (preExecute () in synfony) DB connection processing is in progress. The process to disconnect the DB connection at the end of the request is included. (postExecute)

• @subscriber(ApplicationCreated)

Called only once immediately after the web server is started.

pyramid.httpexceptions.HTTPFound

• return HTTPFound(location=request.route_url('list'))

Redirects to a specific page to prevent double registration by reloading the page.

logging

python

import logging
logging.basicConfig()
log = logging.getLogger(__file__)
log.warn('NewRequest')

• The message WARNING: tasks.py: NewRequest is displayed.
• There are debug, info, warning, error, critical, but you can display debug messages only during development.

@reify

It caches the result of the function and returns only the result without processing after the first time.

pyramid.session

python

  session_factory = UnencryptedCookieSessionFactoryConfig('itsaseekreet')
  config = Configurator(settings=settings, session_factory=session_factory)

python

  request.session.flash('Task was successfully reopen!')  #Set value for session
  #template side:
  % if request.session.peek_flash(): #Check if the session has a value
      request.session.pop_flash()     #Show session value
  % endif

sqlite3

select

  rs = request.db.execute("select id, name from tasks where closed = 0")
  tasks = [dict(id=row[0], name=row[1]) for row in rs.fetchall()]

Get only 1 record

    row = rs.fetchone()
    tasks = [dict(id=row[0], name=row[1])]

Refer to the result of select by column name

    request.db = sqlite3.connect(settings['db'])
+   request.db.row_factory = sqlite3.Row

-   tasks = [dict(id=row[0], name=row[1]) for row in rs.fetchall()]
+   tasks = [dict(id=row["id"], name=row["name"]) for row in rs.fetchall()]

update

  task_id = int(request.matchdict['id'])  #Type conversion and set
  #placeholder
  request.db.execute("update tasks set closed = ? where id = ?", (0, task_id))
  request.db.commit()  #It will not be saved unless you commit.

Auto commit ON

    request.db = sqlite3.connect(settings['db'])
    request.db.isolation_level = None
#Or
    request.db = sqlite3.connect(settings['db'], isolation_level = None)

rollback

  request.db.rollback()

pyramid.config.Configurator

Store value in Configurator

mysettings['val'] = "hello"
config = Configurator(settings=mysettings)

Refer to the value stored in Configurator(@subscribers)

request = event.request
settings = request.registry.settings
log.warn(settings['val'])

Refer to the value stored in Configurator(@view)

settings = request.registry.settings
log.warn(settings['val'])

py:development.ini、production.request the value of ini.registry.Store in settings

{'debug_routematch': True, 
 'pyramid.default_locale_name': 'en',
 'db': '/home/user/local/virtualenv/tasks/tasks.db',
 'pyramid.reload_templates': True,
 'debug_templates': True,
 'debug_all': True,
 'reload_templates': True,
 'mako.directories': '/home/user/local/virtualenv/tasks/templates',
 'pyramid.debug_routematch': True,
 'reload_resources': True,
 'default_locale_name': 'en',
 'pyramid.reload_assets': True,
 'reload_all': True,
 'debug_authorization': True,
 'pyramid.debug_authorization': True,
 'pyramid.reload_resources': True,
 'reload_assets': True,
 'pyramid.debug_notfound': True,
 'pyramid.debug_templates': True,
 'prevent_http_cache': False,
 'debug_notfound': True,
 'pyramid.prevent_http_cache': False}

Page 404

python

@view_config(context='pyramid.exceptions.NotFound', renderer='notfound.mako')
def notfound_view(request):
    request.response.status = '404 Not Found'
    return {}

Catch any exceptions

• Example: When a url that does not exist is specified in mako. $ {request.route_url ('forbidden_page')}
• Reference

python

@view_config(context=Exception, renderer='exception.mako')
def error_view(exception, request):
    return {'message':exception}

Other

Get the file directory (absolute path)

python

here = os.path.dirname(os.path.abspath(__file__))

Example of use

os.path.join(here, 'schema.sql')
settings['mako.directories'] = os.path.join(here, 'templates')