wrapper scripts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Templates 35 Template syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Comments . . . . . . . . . 51 Variables set automatically . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Extensions 55 Typography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Literate Haskell support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Other extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Pandoc’s Markdown 63

Introduction 3 2 API 7 3 Sandbox 39 4 Native Python Types 45 5 Template Designer Documentation 47 6 Extensions 89 7 Integration 107 8 Switching from other Template Engines 109 9 Tips and Tricks 115 II Additional install the package via distribute in development mode. This also has the advantage that the C extensions are compiled. 1.2.4 MarkupSafe Dependency As of version 2.7 Jinja2 depends on the MarkupSafe documentation is written with Python 2 in mind, so you will have to adapt the shown code examples to Python 3 syntax for yourself. 5 6 CHAPTER 2 API This document describes the API to Jinja2 and not the template

port number to be used in self-referential URL’s. The Apache-2.0 equivalent is the new SERVERNAME syntax: it has been changed to allow specifying both the hostname and the port number for self-referential Expression Library2 (PCRE). All regular expression evaluation now uses the more powerful Perl 5 syntax. 2http://www.pcre.org/ 1.2. OVERVIEW OF NEW FEATURES IN APACHE 2.0 5 Module Enhancements MOD document. Results from regular expression parsing and grouping (now based on Perl’s regular expression syntax) can be retrieved using MOD INCLUDE’s variables $0 .. $9. MOD AUTH DBM Now supports multiple types

Expression Library6 (PCRE). All regular expression evaluation now uses the more powerful Perl 5 syntax. 6http://www.pcre.org/ 8 CHAPTER 1. RELEASE NOTES Module Enhancements MOD SSL New module in Apache document. Results from regular expression parsing and grouping (now based on Perl’s regular expression syntax) can be retrieved using MOD INCLUDE’s variables $0 .. $9. MOD AUTH DBM Now supports multiple types information. (Don’t include the brackets!) The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included

FILTERPROVIDER syntax has changed and now uses a boolean expression to determine if a filter is applied. • MOD INCLUDE: – The #if expr element now uses the new expression parser (p. 88) . The old syntax can be compressed. • Multi-language error documents from 2.2.x may not work unless they are adjusted to the new syntax of MOD INCLUDE’s #if expr= element or the directive SSILEGACYEXPRPARSER is enabled for the directory expression parser A new expression parser allows to specify complex conditions (p. 88) using a common syntax in directives like SETENVIFEXPR, REWRITECOND, HEADER, , and others. KeepAliveTimeout in milliseconds

FILTERPROVIDER syntax has changed and now uses a boolean expression to determine if a filter is applied. • MOD INCLUDE: – The #if expr element now uses the new expression parser (p. 88) . The old syntax can be compressed. • Multi-language error documents from 2.2.x may not work unless they are adjusted to the new syntax of MOD INCLUDE’s #if expr= element or the directive SSILEGACYEXPRPARSER is enabled for the directory expression parser A new expression parser allows to specify complex conditions (p. 88) using a common syntax in directives like SETENVIFEXPR, REWRITECOND, HEADER, , and others. KeepAliveTimeout in milliseconds

FILTERPROVIDER syntax has changed and now uses a boolean expression to determine if a filter is applied. • MOD INCLUDE: – The #if expr element now uses the new expression parser (p. 92) . The old syntax can be compressed. • Multi-language error documents from 2.2.x may not work unless they are adjusted to the new syntax of MOD INCLUDE’s #if expr= element or the directive SSILEGACYEXPRPARSER is enabled for the directory expression parser A new expression parser allows to specify complex conditions (p. 92) using a common syntax in directives like SETENVIFEXPR, REWRITECOND, HEADER, , and others. KeepAliveTimeout in milliseconds

FILTERPROVIDER syntax has changed and now uses a boolean expression to determine if a filter is applied. • MOD INCLUDE: – The #if expr element now uses the new expression parser (p. 92) . The old syntax can be compressed. • Multi-language error documents from 2.2.x may not work unless they are adjusted to the new syntax of MOD INCLUDE’s #if expr= element or the directive SSILEGACYEXPRPARSER is enabled for the directory expression parser A new expression parser allows to specify complex conditions (p. 92) using a common syntax in directives like SETENVIFEXPR, REWRITECOND, HEADER, , and others. KeepAliveTimeout in milliseconds

varying-length sequences. You can use the type tuple[T, ...] (with a literal ... – it’s part of the syntax) for this purpose. Example: def print_squared(t: tuple[int, ...]) -> None: for n in t: print(n X | Y syntax for Unions PEP 604 introduced an alternative way for spelling union types. In Python 3.10 and later, you can write Union[int, str] as int | str. It is possible to use this syntax in versions Kinds of types 31 Mypy Documentation, Release 1.8.0 from typing import TypeAlias # "from typing_extensions" in Python 3.9 and earlier AliasType: TypeAlias = Union[list[dict[tuple[int, str], set[int]]]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 6.4 Extensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . own functionality using signals and a well-defined API (middlewares, extensions, and pipelines). • Wide range of built-in extensions and middlewares for handling: – cookies and session handling – HTTP page) 2016-12-16 21:24:05 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/ ˓→min), scraped 0 items (at 0 items/min) 2016-12-16 21:24:05 [scrapy.extensions.telnet] DEBUG: Telnet console listening