Creating a Pyramid Project [note of steps] pyramid框架入门研究笔记
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It's from http://docs.pylonsproject.org/projects/pyramid/en/latest/narr/project.html#manifest-in
Scaffolds Included with Pyramid¶
The included scaffolds are these:
- starter
- URL mapping via URL dispatch and no persistence mechanism.
- zodb
- URL mapping via traversal and persistence via ZODB. Note that, as of this writing, this scaffold will not run under Python 3, only under Python 2.
- alchemy
- URL mapping via URL dispatch and persistence via SQLAlchemy
Creating the Project
On UNIX:
Or on Windows:
The above command uses the pcreate command to create a project with the starter scaffold. To use a different scaffold, such as alchemy, you’d just change the -s argument value. For example, on UNIX:
You’ll need to avoidusing pcreate to create a project with the same name as a Python standard library component. In particular, this means you should avoid using the names site or test, both of which conflict with Python standard library packages. You should also avoid using the name pyramid, which will conflict with Pyramid itself.
Installing your Newly Created Project for Development
To install a newly created project for development, you should cd to the newly created project directory and use the Python interpreter from the virtualenv you created duringInstalling Pyramid to invoke the command python setup.py develop
The file named setup.py will be in the root of the pcreate-generated project directory. The python you’re invoking should be the one that lives in the bin (or Scripts on Windows) directory of your virtual Python environment. Your terminal’s current working directory must be the newly created project directory.
On UNIX:
Or on Windows:
Elided output from a run of this command on UNIX is shown below:
This will install a distribution representing your project into the interpreter’s library set so it can be found by import statements and by other console scripts such as pserve,pshell, proutes and pviews.
Running The Tests For Your Application
To run unit tests for your application, you should invoke them using the Python interpreter from the virtualenv you created during Installing Pyramid (the python command that lives in the bin directory of your virtualenv).
On UNIX:
Or on Windows:
Here’s sample output from a test run on UNIX:
The -q option is passed to the setup.py test command to limit the output to a stream of dots. If you don’t pass -q, you’ll see more verbose test result output (which normally isn’t very useful).
The tests themselves are found in the tests.py module in your pcreate generated project. Within a project generated by the starter scaffold, a single sample test exists.
Running The Project Application
Once a project is installed for development, you can run the application it represents using the pserve command against the generated configuration file. In our case, this file is named development.ini.
On UNIX:
On Windows:
Here’s sample output from a run of pserve on UNIX:
When you use pserve to start the application implied by the default rendering of a scaffold, it will respond to requests on all IP addresses possessed by your system,not just requests to localhost.This is what the 0.0.0.0 in serving on http://0.0.0.0:6543 means.The server will respond to requests made to 127.0.0.1 and on any external IP address. For example, your system might be configured to have an external IP address 192.168.1.50. If that’s the case, if you use a browser running on the same system as Pyramid, it will be able to access the application via http://127.0.0.1:6543/ as well as via http://129.168.1.50:6543/. However, other people on other computers on the same network will also be able to visit your Pyramid application in their browser by visiting http://192.168.1.50:6543/.
If you want to restrict access such that only a browser running on the same machineas Pyramid will be able to access your Pyramid application, edit the development.ini file, and replace the host value in the [server:main] section.Change it from 0.0.0.0 to 127.0.0.1. For example:
You can change the port on which the server runs on by changing the same portion of the development.ini file. For example, you can change the port = 6543 line in thedevelopment.ini file’s [server:main] section to port = 8080 to run the server on port 8080 instead of port 6543.
You can shut down a server started this way by pressing Ctrl-C.
The default server used to run your Pyramid application when a project is created from a scaffold is named Waitress. This server is what prints the serving on... line when you run pserve. It’s a good idea to use this server during development, because it’s very simple. It can also be used for light production. Setting your application up under a different server is not advised until you’ve done some development work under the default server, particularly if you’re not yet experienced with Python web development. Python web server setup can be complex, and you should get some confidence that your application works in a default environment before trying to optimize it or make it “more like production”. It’s awfully easy to get sidetracked trying to set up a nondefault server for hours without actually starting to do any development. One of the nice things about Python web servers is that they’re largely interchangeable, so if your application works under the default server, it will almost certainly work under any other server in production if you eventually choose to use a different one. Don’t worry about it right now.
For more detailed information about the startup process, see Startup. For more information about environment variables and configuration file settings that influence startup and runtime behavior, see Environment Variables and .ini File Settings.
Reloading Code (为了你调试方便，文件更改后自动重启服务器）
During development, it’s often useful to run pserve using its --reload option. When --reload is passed to pserve, changes to any Python module your project uses will cause the server to restart. This typically makes development easier, as changes to Python code made within a Pyramid application is not put into effect until the server restarts.
For example, on UNIX:
Now if you make a change to any of your project’s .py files or .ini files, you’ll see the server restart automatically:
Changes to template files (such as .pt or .mak files) won’t cause the server to restart. Changes to template files don’t require a server restart as long as thepyramid.reload_templates setting in the development.ini file is true. Changes made to template files when this setting is true will take effect immediately without a server restart.
Viewing the Application
Once your application is running via pserve, you may visit http://localhost:6543/ in your browser. You will see something in your browser like what is displayed in the following image:
This is the page shown by default when you visit an unmodified pcreate generated starter application in a browser.
The Debug Toolbar
If you click on the image shown at the right hand top of the page (“^DT”), you’ll be presented with a debug toolbar that provides various niceties while you’re developing. This image will float above every HTML page served by Pyramid while you develop an application, and allows you show the toolbar as necessary. Click on Hide to hide the toolbar and show the image again.
If you don’t see the debug toolbar image on the right hand top of the page, it means you’re browsing from a system that does not have debugging access. By default, for security reasons, only a browser originating from localhost (127.0.0.1) can see the debug toolbar. To allow your browser on a remote system to access the server, add the a line within the [app:main] section of the development.ini file in the form debugtoolbar.hosts = X.X.X.X. For example, if your Pyramid application is running on a remote system, and you’re browsing from a host with the IP address 192.168.1.1, you’d add something like this to enable the toolbar when your system contacts Pyramid:
For more information about what the debug toolbar allows you to do, see the documentation for pyramid_debugtoolbar.
The debug toolbar will not be shown (and all debugging will be turned off) when you use the production.ini file instead of the development.ini ini file to run the application.
You can also turn the debug toolbar off by editing development.ini and commenting out a line. For example, instead of:
Put a hash mark at the beginning of the pyramid_debugtoolbar line:
Then restart the application to see that the toolbar has been turned off.
Note that if you comment out the pyramid_debugtoolbar line, the # must be in the first column. If you put the hash mark anywhere except the first column instead, for example like this:
When you attempt to restart the application with a section like the above you’ll receive an error that ends something like this, and the application will not start:
The Project Structure 工程结构
The starter scaffold generated a project (named MyProject), which contains a Python package. The package is also named myproject, but it’s lowercased; the scaffold generates a project which contains a package that shares its name except for case.
All Pyramid pcreate -generated projects share a similar structure. The MyProject project we’ve generated has the following directory structure:
The MyProject Project¶
The MyProject project directory is the distribution and deployment wrapper for your application. It contains both the myproject package representing your application as well as files used to describe, run, and test your application.
- CHANGES.txt describes the changes you’ve made to the application. It is conventionally written in ReStructuredText format.
- README.txt describes the application in general. It is conventionally written in ReStructuredText format.
- development.ini is a PasteDeploy configuration file that can be used to execute your application during development.
- production.ini is a PasteDeploy configuration file that can be used to execute your application in a production configuration.
- setup.cfg is a setuptools configuration file used by setup.py.
- MANIFEST.in is a distutils “manifest” file, naming which files should be included in a source distribution of the package when python setup.py sdist is run.
- setup.py is the file you’ll use to test and distribute your application. It is a standard setuptools setup.py file.
development.ini
The development.ini file is a PasteDeploy configuration file. Its purpose is to specify an application to run when you invoke pserve, as well as the deployment settings provided to that application.
The generated development.ini file looks like so:
This file contains several sections including [app:main], [server:main] and several other sections related to logging configuration.
The [app:main] section represents configuration for your Pyramid application. The use setting is the only setting required to be present in the [app:main] section. Its default value, egg:MyProject, indicates that our MyProject project contains the application that should be served. Other settings added to this sectionare passed as keyword arguments to the function named main in our package’s __init__.py module（这个会话的其他别的设置，都以关键字参数的形式传递到__init__.py 模块里）. You can provide startup-time configuration parameters to your application by adding more settings to this section.
可以查看See Entry Points and PasteDeploy .ini Files for more information about the meaning of the use = egg:MyProject value in this section.
The pyramid.reload_templates setting in the [app:main] section is a Pyramid -specific setting which is passed into the framework. If it exists, and its value is true, Chameleonand Mako template changes will not require an application restart to be detected. See Automatically Reloading Templates for more information.
The pyramid.reload_templates option should be turned off for production applications, as template rendering is slowed when it is turned on.
The pyramid.includes setting in the [app:main] section tells Pyramid to “include” configuration from another package. In this case, the line pyramid.includes =pyramid_debugtoolbar tells Pyramid to include configuration from the pyramid_debugtoolbar package. This turns on a debugging panel in development mode which will be shown on the right hand side of the screen. Including the debug toolbar will also make it possible to interactively debug exceptions when an error occurs.
Various other settings may exist in this section having to do with debugging or influencing runtime behavior of a Pyramid application. See Environment Variables and .ini File Settings for more information about these settings.
The name main in [app:main] signifies that this is the default application run by pserve when it is invoked against this configuration file. The name main is a convention used by PasteDeploy signifying that it is the default application.
The [server:main] section of the configuration file configures a WSGI server which listens on TCP port 6543. It is configured to listen on all interfaces (0.0.0.0). This means that any remote system which has TCP access to your system can see your Pyramid application.
The sections that live between the markers # Begin logging configuration and # End logging configuration represent Python’s standard library logging module configuration for your application. The sections between these two markers are passed to the logging module’s config file configuration engine when the pserve or pshellcommands are executed. The default configuration sends application logging output to the standard error output of your terminal. For more information about logging configuration, see Logging.
See the PasteDeploy documentation for more information about other types of things you can put into this .ini file, such as other applications, middleware and alternate WSGIserver implementations.
production.ini
The production.ini file is a PasteDeploy configuration file with a purpose much like that of development.ini. However, it disables the debug toolbar, and filters all log messages except those above the WARN level.It also turns off template development optionssuch that templates are not automatically reloaded when changed, and turns off all debugging options. This file is appropriate to use instead of development.ini when you put your application into production.
It’s important to use production.ini (and not development.ini) to benchmark your application and put it into production. development.ini configures your system with a debug toolbar that helps development, but the inclusion of this toolbar slows down page rendering times by over an order of magnitude.The debug toolbar is also a potential security risk if you have it configured incorrectly.
MANIFEST.in
The MANIFEST.in file is a distutils configuration file which specifies the non-Python files that should be included when a distribution of your Pyramid project is created when you run python setup.py sdist.Due to the information contained in the default MANIFEST.in, an sdist of your Pyramid project will include .txt files, .ini files, .rst files, graphics files, and template files, as well as .py files. See http://docs.python.org/distutils/sourcedist.html#the-manifest-in-template for more information about the syntax and usage of MANIFEST.in.
Without the presence of a MANIFEST.in file or without checking your source code into a version control repository, setup.py sdist places only Python source files (files ending with a .py extension) into tarballs generated by python setup.py sdist. This means, for example, if your project was not checked into a setuptools-compatible source control system, and your project directory didn’t contain a MANIFEST.in file that told the sdist machinery to include *.pt files, the myproject/templates/mytemplate.pt file would not be included in the generated tarball.
Projects generated by Pyramid scaffolds include a default MANIFEST.in file.The MANIFEST.in file contains declarations which tell it to include files like *.pt, *.css and *.js in the generated tarball. If you include files with extensions other than the files named in the project’s MANIFEST.in and you don’t make use of a setuptools-compatible version control system, you’ll need to edit the MANIFEST.in file and include the statements necessary to include your new files. See http://docs.python.org/distutils/sourcedist.html#principle for more information about how to do this.
You can also delete MANIFEST.in from your project and rely on a setuptools feature which simply causes all files checked into a version control system to be put into the generated tarball. To allow this to happen, check all the files that you’d like to be distributed along with your application’s Python files into Subversion. After you do this, when you rerunsetup.py sdist, all files checked into the version control system will be included in the tarball. If you don’t use Subversion, and instead use a different version control system, you may need to install a setuptools add-on such as setuptools-git or setuptools-hg for this behavior to work properly.
setup.py
The setup.py file is a setuptools setup file. It is meant to be run directly from the command line to perform a variety of functions, such as testing your application, packaging, and distributing your application.
setup.py is the de facto standard which Python developers use to distribute their reusable code. You can read more about setup.py files and their usage in theSetuptools documentation and The Hitchhiker’s Guide to Packaging.
Our generated setup.py looks like this:
The setup.py file calls the setuptools setup function, which does various things depending on the arguments passed to setup.py on the command line.
Within the arguments to this function call, information about your application is kept. While it’s beyond the scope of this documentation to explain everything about setuptools setup files, we’ll provide a whirlwind tour of what exists in this file in this section.
Your application’s name can be any string; it is specified in the name field. The version number is specified in the version value. A short description is provided in thedescription field. The long_description is conventionally the content of the README and CHANGES file appended together. The classifiers field is a list of Trove classifiers describing your application. author and author_email are text fields which probably don’t need any description. url is a field that should point at your application project’s URL (if any). packages=find_packages() causes all packages within the project to be found when packaging the application. include_package_data will include non-Python files when the application is packaged if those files are checked into version control. zip_safe indicates that this package is not safe to use as a zipped egg; instead it will always unpack as a directory, which is more convenient. install_requires and tests_require indicate that this package depends on the pyramid package. test_suite points at the package for our application, which means all tests found in the package will be run when setup.py test is invoked. We examined entry_points in our discussion of thedevelopment.ini file; this file defines the main entry point that represents our project’s application.
Usually you only need to think about the contents of the setup.py filewhen distributing your application to other people, when adding Python package dependencies, or when versioning your application for your own use. For fun, you can try this command now:
This will create a tarball of your application in a dist subdirectory named MyProject-0.1.tar.gz. You can send this tarball to other people who want to install and use your application.
setup.cfg
The setup.cfg file is a setuptools configuration file. It contains various settings related to testing and internationalization:
Our generated setup.cfg looks like this:
The values in the default setup file allow various commonly-used internationalization commands and testing commands to work more smoothly.
The myproject Package （内部的package“全是小写的字母”）
The myproject package lives inside the MyProject project. It contains:
- An __init__.py file signifies that this is a Python package. It also contains code that helps users run the application, including a main function which is used as a entry point for commands such as pserve, pshell, pviews, and others.
- A templates directory, which contains Chameleon (or other types of) templates.# 这里我们可以换用mako
- A tests.py module, which contains unit test code for the application.
- A views.py module, which contains view code for the application.
These are purely conventions established by the scaffold: Pyramid doesn’t insist that you name things in any particular way. However, it’s generally a good idea to follow Pyramid standards for naming, so that other Pyramid developers can get up to speed quickly on your code when you need help.
__init__.py
We need a small Python module that configures our application and which advertises an entry point for use by our PasteDeploy .ini file. This is the file named __init__.py. The presence of an __init__.py also informs Python that the directory which contains it is a package.
Line 1 imports the Configurator class from pyramid.config that we use later.
Lines 4-11 define a function named main that returns a Pyramid WSGI application. This function is meant to be called by the PasteDeploy framework as a result of runningpserve.
Within this function, application configuration is performed.
Line 7 creates an instance of a Configurator.
Line 8 registers a static view, which will serve up the files from the myproject:static asset specification (the static directory of the myproject package).
Line 9 adds a route to the configuration. This route is later used by a view in the views module.
Line 10 calls config.scan(), which picks up view registrations declared elsewhere in the package (in this case, in the views.py module).
Line 11 returns a WSGI application to the caller of the function (Pyramid’s pserve).
views.py
Much of the heavy lifting in a Pyramid application is done by viewcallables.A view callable is the main tool of a Pyramid web application developer;it is a bit of code which accepts a request and which returns a response.
Lines 4-6 define and register a view callable named my_view.The function named my_view is decorated with a view_config decorator (which is processed by the config.scan()line in our __init__.py). The view_config decorator asserts that this view be found when a route named home is matched. In our case, because our __init__.py maps the route named home to the URL pattern /, this route will match when a visitor visits the root URL. The view_config decorator also names a renderer, which in this case is a template that will be used to render the result of the view callable. This particular view declaration points at templates/mytemplate.pt, which is a asset specification that specifies themytemplate.pt file within the templates directory of the myproject package. The asset specification could have also been specified as myproject:templates/mytemplate.pt; the leading package name and colon is optional. The template file it actually points to is a Chameleon ZPT template file.
This view callable function is handed a single piece of information: the request. The request is an instance of the WebOb Request class representing the browser’s request to our server.
This view returns a dictionary. When this view is invoked, a renderer converts the dictionary returned by the view into HTML, and returns the result as the response. This view is configured to invoke a renderer which uses a Chameleon ZPT template (templates/my_template.pt).
See Writing View Callables Which Use a Renderer for more information about how views, renderers, and templates relate and cooperate.
注意！Because our development.ini has a pyramid.reload_templates = true directive indicating that templates should be reloaded when they change, you won’t need to restart the application server to see changes you make to templates. During development, this is handy. If this directive had been false (or if the directive did not exist), you would need to restart the application server for each template change. For production applications, you should set your project’spyramid.reload_templates to false to increase the speed at which templates may be rendered.
static
This directory contains static assets which support the mytemplate.pt template. It includes CSS and images.
templates/mytemplate.pt
The single Chameleon template that exists in the project. Its contents are too long to show here, but it displays a default page when rendered.It is referenced by the call to@view_config as the renderer of the my_view view callable in the views.py file. See Writing View Callables Which Use a Renderer for more information about renderers.
Templates are accessed and used by view configurations and sometimes by view functions themselves. See Using Templates Directly and Templates Used as Renderers via Configuration.
tests.py
The tests.py module includes unit tests for your application.
This sample tests.py file has a single unit test defined within it. This test is executed when you run python setup.py test. You may add more tests here as you build your application. You are not required to write tests to use Pyramid, this file is simply provided as convenience and example.
See Unit, Integration, and Functional Testing for more information about writing Pyramid unit tests.
Modifying Package Structure（bookmark!书签处）
It is best practice for your application’s code layout to not stray too much from accepted Pyramid scaffold defaults. If you refrain from changing things very much, other Pyramid coders will be able to more quickly understand your application. However, the code layout choices made for you by a scaffold are in no way magical or required. Despite the choices made for you by any scaffold, you can decide to lay your code out any way you see fit.
For example, the configuration method named add_view() requires you to pass a dotted Python name or a direct object reference as the class or function to be used as a view. By default, the starter scaffold would have you add view functions to the views.py module in your package. However, you might be more comfortable creating a views directory, and adding a single file for each view.
If your project package name was myproject and you wanted to arrange all your views in a Python subpackage within the myproject package named views instead of within a single views.py file, you might:
- Create a views directory inside your myproject package directory (the same directory which holds views.py).
- Move the existing views.py file to a file inside the new views directory named, say, blog.py.
- Create a file within the new views directory named __init__.py (it can be empty, this just tells Python that the views directory is a package.
You can then continue to add view callable functions to the blog.py module, but you can also add other .py files which contain view callable functions to the views directory. As long as you use the @view_config directive to register views in conjunction with config.scan() they will be picked up automatically when the application is restarted.
Using the Interactive Shell
It is possible to use the pshell command to load a Python interpreter prompt with a similar configuration as would be loaded if you were running your Pyramid application via pserve. This can be a useful debugging tool. See The Interactive Shell for more details.
链接在这里：http://docs.pylonsproject.org/projects/pyramid/en/latest/narr/commandline.html#interactive-shell
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简易用法：
If so, you can use the following command to invoke a debug shell using the name main as a section name:
The WSGI application that is loaded will be available in the shell as the app global. Also, if the application that is loaded is the Pyramid app with no surrounding middleware, theroot object returned by the default root factory, registry, and request will be available.
You can also simply rely on the main default section name by omitting any hash after the filename:
Press Ctrl-D to exit the interactive shell (or Ctrl-Z on Windows).
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What Is This pserve Thing
The code generated by an Pyramid scaffoldassumes that you will be using the pserve command to start your application while you do development. pserve is a command that reads a PasteDeploy .ini file (e.g. development.ini) and configures a server to serve a Pyramid application based on the data in the file.
请阅读：pserve is by no means the only way to start up and serve a Pyramid application. As we saw in Creating Your First Pyramid Application, pserve needn’t be invoked at all to run aPyramid application. The use of pserve to run a Pyramid application is purely conventional based on the output of its scaffolding. But we strongly recommend using while developing your application, because many other convenience introspection commands (such as pviews, prequest, proutes and others) are also implemented in terms of configuration availability of this .ini file format. It also configures Pyramid logging and provides the --reload switch for convenient restarting of the server when code changes.
Using an Alternate WSGI Server
Pyramid scaffolds generate projects which use the Waitress WSGI server. Waitress is a server that is suited for development and light production usage. It’s not the fastest nor the most featureful WSGI server. Instead, its main feature is that it works on all platforms that Pyramid needs to run on, making it a good choice as a default server from the perspective of Pyramid’s developers.
Any WSGI server is capable of running a Pyramid application. But we suggest you stick with the default server for development, and that you wait to investigate other server options until you’re ready to deploy your application to production. Unless for some reason you need to develop on a non-local system, investigating alternate server options is usually a distraction until you’re ready to deploy. But we recommend developing using the default configuration on a local system that you have complete control over; it will provide the best development experience.
One popular production alternative to the default Waitress server is mod_wsgi.You can use mod_wsgi to serve your Pyramid applicationusing the Apache web server rather than any “pure-Python” server like Waitress. It is fast and featureful. See Running a Pyramid Application under mod_wsgi for details.
Another good production alternative is Green Unicorn (aka gunicorn). It’s faster than Waitress and slightly easier to configure than mod_wsgi, although it depends, in its default configuration, on having a buffering HTTP proxy in front of it. It does not, as of this writing, work on Windows.
In Fact， 我们需要Nginx的中间件！！
终于整完了。
后面要换用模板引擎了。chameleno的语法太令人痛苦了。还是mako的看起来舒服。这里面再加上mako的地址。http://www.makotemplates.org/
Nutshell:
<%inherit file="base.html"/><% rows = [[v for v in range(0,10)] for row in range(0,10)]%><table> % for row in rows: ${makerow(row)} % endfor</table><%def name="makerow(row)"> <tr> % for name in row: <td>${name}</td>\ % endfor </tr></%def>
Philosophy:
Python is a great scripting language. Don't reinvent the wheel...your templates can handle it !
Features:
- Super-simple API. For basic usage, just one class, Template is needed:
from mako.template import Templateprint Template("hello ${data}!").render(data="world")
具体点击链接查看官网。挺好看的样式。
Syntax really does matter!
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