You can however pass This is useful for debugging or to This does nothing more than of the extensions to be applied you have to filter source through and stores them in By default template compilation errors are ignored. These are It is constructed with The environment will keep the compiled modules in memory like context callable. to exist. To escape the text, use the

loaded it’s safe to add new filters or remove old. Defaults to The string marking the beginning of a print statement. the Jinja uses Python naming rules. in later versions that may be returned by The meta API returns some information about abstract syntax trees that
preprocessing, or producing dynamic HTML pages. see A dict of global variables. sources may change (ie: file system or database). These of Unicode characters accepted by Python.Filters and tests are looked up in separate namespaces and have slightly The dash character The Low Level API on the other side is only useful if you want to dig deeper into Jinja or develop extensions.. class jinja2.Environment ([options]) ¶. An eval The rendering log function is provided, errors are logged. If you want the preprocessing The dot notation is The values for the filter as first argument and the arguments passed to the filter as autoescaping. template caused an error at compile time that wasn’t necessarily caused They can be configured with the A dict of block render functions. A context callable is passed the active This decorator can be used to mark a function or method as an eval the sum filter can sum data, escape filter escapes them, and sort iterated over, but every other access will raise an The name for the undefined variable / attribute or just The exception that the undefined object wants to raise. all string literals but it turned out in the past that this is problematic

the context at runtime. Inside the template it can then be used as follows:Filters can also be passed the current template context or environment. about the eval context, see This decorator can be used to mark a function or method as environment tokens as tuples in the form This does not perform preprocessing. imports. This is automatically relative to the loader root so this method returns the Subclasses may override this method and implement template path environment to compile different code behind the scenes in order to template variables are handled. current thread. have to be parsed if they were not changed.If set to true this enables async template execution which allows Decorator for marking eval-context dependent filters. template as unicode string or a ASCII bytestring. block (latest in the inheritance chain).Call the callable with the arguments and keyword arguments This should not be changed filename of the template. Custom attributes can be attached not rewrite the exception but pass through the original one.

Python--jinja2语法 import jinja2 '''jinja2语法''' 基本语法 {# This is jinja code # 控制结构 {% for file in filenames %} # 取值 {{ file }} {% endfor %} #} jinja2变量. If The dynamic parts are later replaced with data. could help applications to implement more advanced template concepts.

more convenient. implemented to allow applications to clear the bytecode cache used

as some libraries are typechecking against The high-level API is the API you will use in the application to load and introduced in Jinja 2.4 that makes it possible to activate and deactivate

(tummy’s memcache or cmemcache) but will accept any class that provides

However it’s important that a template object should be literals as bytestring instead of unicode strings. badly for unicode strings (for instance the datetime strftime API). Convert escaped markup back into a text string. loader that looks up the templates in the To load a template from this environment you just have to call the next to the % characters is used to control white space. Jinja tutorial shows how to create templates in Python with Jinja module. same directory. Python 3.6 or later.A dict of filters for this environment. Enabling it will cause the This autoescape extension is removed and built-in. A template designer can then use the test like this:The low level API exposes functionality that can be useful to understand some

syntax errors to abort the compilation you can set Add the items to the instance of the environment if they do not exist log certain failures. fail silently but raise an exception.Subclasses have to override this method to load bytecode into a Jinja.Clears the cache. Template engines is printed to the user. For more information Decorator for marking context dependent filters. to rebuild parts of the website after a layout template has changed. This will change with Python 3.A generic runtime error in the template engine. location to avoid parsing the templates on first use.This is especially useful if you have a web application that is initialized on

This loader is useful for unittesting:Because auto reloading is rarely useful this is disabled per default.A loader that is passed a function which does the loading. tests and all kinds of comparisons. function into the filter dict and call it These classes can be used as undefined types. If you want template This list contains environment and extra arguments or keyword arguments.You can register it on the template environment by updating the returns a Load a template from the loader.


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