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張 旭

Template Designer Documentation - Jinja2 Documentation (2.10) - 0 views

jinja.pocoo.org/...templates

python jinja template programming

shared by 張 旭 on 18 Feb 19 - No Cached
  • A Jinja template doesn’t need to have a specific extension
  • A Jinja template is simply a text file
  • tags, which control the logic of the template
  • ...106 more annotations...
  • {% ... %} for Statements
  • {{ ... }} for Expressions to print to the template output
  • use a dot (.) to access attributes of a variable
  • the outer double-curly braces are not part of the variable, but the print statement.
  • If you access variables inside tags don’t put the braces around them.
  • If a variable or attribute does not exist, you will get back an undefined value.
  • the default behavior is to evaluate to an empty string if printed or iterated over, and to fail for every other operation.
  • if an object has an item and attribute with the same name. Additionally, the attr() filter only looks up attributes.
  • Variables can be modified by filters. Filters are separated from the variable by a pipe symbol (|) and may have optional arguments in parentheses.
  • Multiple filters can be chained
  • Tests can be used to test a variable against a common expression.
  • add is plus the name of the test after the variable.
  • to find out if a variable is defined, you can do name is defined, which will then return true or false depending on whether name is defined in the current template context.
  • strip whitespace in templates by hand. If you add a minus sign (-) to the start or end of a block (e.g. a For tag), a comment, or a variable expression, the whitespaces before or after that block will be removed
  • not add whitespace between the tag and the minus sign
  • mark a block raw
  • Template inheritance allows you to build a base “skeleton” template that contains all the common elements of your site and defines blocks that child templates can override.
  • The {% extends %} tag is the key here. It tells the template engine that this template “extends” another template.
  • access templates in subdirectories with a slash
  • can’t define multiple {% block %} tags with the same name in the same template
  • use the special self variable and call the block with that name
  • self.title()
  • super()
  • put the name of the block after the end tag for better readability
  • if the block is replaced by a child template, a variable would appear that was not defined in the block or passed to the context.
  • setting the block to “scoped” by adding the scoped modifier to a block declaration
  • If you have a variable that may include any of the following chars (>, <, &, or ") you SHOULD escape it unless the variable contains well-formed and trusted HTML.
  • Jinja2 functions (macros, super, self.BLOCKNAME) always return template data that is marked as safe.
  • With the default syntax, control structures appear inside {% ... %} blocks.
  • the dictsort filter
  • loop.cycle
  • Unlike in Python, it’s not possible to break or continue in a loop
  • use loops recursively
  • add the recursive modifier to the loop definition and call the loop variable with the new iterable where you want to recurse.
  • The loop variable always refers to the closest (innermost) loop.
  • whether the value changed at all,
  • use it to test if a variable is defined, not empty and not false
  • Macros are comparable with functions in regular programming languages.
  • If a macro name starts with an underscore, it’s not exported and can’t be imported.
  • pass a macro to another macro
  • caller()
  • a single trailing newline is stripped if present
  • other whitespace (spaces, tabs, newlines etc.) is returned unchanged
  • a block tag works in “both” directions. That is, a block tag doesn’t just provide a placeholder to fill - it also defines the content that fills the placeholder in the parent.
  • Python dicts are not ordered
  • caller(user)
  • call(user)
  • This is a simple dialog rendered by using a macro and a call block.
  • Filter sections allow you to apply regular Jinja2 filters on a block of template data.
  • Assignments at top level (outside of blocks, macros or loops) are exported from the template like top level macros and can be imported by other templates.
  • using namespace objects which allow propagating of changes across scopes
  • use block assignments to capture the contents of a block into a variable name.
  • The extends tag can be used to extend one template from another.
  • Blocks are used for inheritance and act as both placeholders and replacements at the same time.
  • The include statement is useful to include a template and return the rendered contents of that file into the current namespace
  • Included templates have access to the variables of the active context by default.
  • putting often used code into macros
  • imports are cached and imported templates don’t have access to the current template variables, just the globals by default.
  • Macros and variables starting with one or more underscores are private and cannot be imported.
  • By default, included templates are passed the current context and imported templates are not.
  • imports are often used just as a module that holds macros.
  • Integers and floating point numbers are created by just writing the number down
  • Everything between two brackets is a list.
  • Tuples are like lists that cannot be modified (“immutable”).
  • A dict in Python is a structure that combines keys and values.
  • // Divide two numbers and return the truncated integer result
  • The special constants true, false, and none are indeed lowercase
  • all Jinja identifiers are lowercase
  • (expr) group an expression.
  • The is and in operators support negation using an infix notation
  • in Perform a sequence / mapping containment test.
  • | Applies a filter.
  • ~ Converts all operands into strings and concatenates them.
  • use inline if expressions.
  • always an attribute is returned and items are not looked up.
  • default(value, default_value=u'', boolean=False)¶ If the value is undefined it will return the passed default value, otherwise the value of the variable
  • dictsort(value, case_sensitive=False, by='key', reverse=False)¶ Sort a dict and yield (key, value) pairs.
  • format(value, *args, **kwargs)¶ Apply python string formatting on an object
  • groupby(value, attribute)¶ Group a sequence of objects by a common attribute.
  • grouping by is stored in the grouper attribute and the list contains all the objects that have this grouper in common.
  • indent(s, width=4, first=False, blank=False, indentfirst=None)¶ Return a copy of the string with each line indented by 4 spaces. The first line and blank lines are not indented by default.
  • join(value, d=u'', attribute=None)¶ Return a string which is the concatenation of the strings in the sequence.
  • map()¶ Applies a filter on a sequence of objects or looks up an attribute.
  • pprint(value, verbose=False)¶ Pretty print a variable. Useful for debugging.
  • reject()¶ Filters a sequence of objects by applying a test to each object, and rejecting the objects with the test succeeding.
  • replace(s, old, new, count=None)¶ Return a copy of the value with all occurrences of a substring replaced with a new one.
  • round(value, precision=0, method='common')¶ Round the number to a given precision
  • even if rounded to 0 precision, a float is returned.
  • select()¶ Filters a sequence of objects by applying a test to each object, and only selecting the objects with the test succeeding.
  • sort(value, reverse=False, case_sensitive=False, attribute=None)¶ Sort an iterable. Per default it sorts ascending, if you pass it true as first argument it will reverse the sorting.
  • striptags(value)¶ Strip SGML/XML tags and replace adjacent whitespace by one space.
  • tojson(value, indent=None)¶ Dumps a structure to JSON so that it’s safe to use in <script> tags.
  • trim(value)¶ Strip leading and trailing whitespace.
  • unique(value, case_sensitive=False, attribute=None)¶ Returns a list of unique items from the the given iterable
  • urlize(value, trim_url_limit=None, nofollow=False, target=None, rel=None)¶ Converts URLs in plain text into clickable links.
  • defined(value)¶ Return true if the variable is defined
  • in(value, seq)¶ Check if value is in seq.
  • mapping(value)¶ Return true if the object is a mapping (dict etc.).
  • number(value)¶ Return true if the variable is a number.
  • sameas(value, other)¶ Check if an object points to the same memory address than another object
  • undefined(value)¶ Like defined() but the other way round.
  • A joiner is passed a string and will return that string every time it’s called, except the first time (in which case it returns an empty string).
  • namespace(...)¶ Creates a new container that allows attribute assignment using the {% set %} tag
  • The with statement makes it possible to create a new inner scope. Variables set within this scope are not visible outside of the scope.
  • activate and deactivate the autoescaping from within the templates
  • With both trim_blocks and lstrip_blocks enabled, you can put block tags on their own lines, and the entire block line will be removed when rendered, preserving the whitespace of the contents
crazylion lee

awslabs/chalice: Python Serverless Microframework for AWS - 0 views

github.com/chalice

aws python framework serverless

shared by crazylion lee on 24 Nov 16 - No Cached
  • crazylion lee on 24 Nov 16
     
    "Python Serverless Microframework for AWS"
crazylion lee

dnaeon/pvc: Python vSphere Client with a dialog(1) interface - 0 views

github.com/pvc

python pvc client vsphere interface

shared by crazylion lee on 17 Apr 16 - No Cached
  • crazylion lee on 17 Apr 16
     
    "Python vSphere Client with a dialog(1) interface"
crazylion lee

Introducing GeoViews | Continuum - 0 views

www.continuum.io/...introducing-geoviews

python geo map

shared by crazylion lee on 11 Sep 16 - No Cached
  • crazylion lee on 11 Sep 16
     
    "GeoViews is a new Python library that makes it easy to explore and visualize geographical, meteorological, oceanographic, weather, climate, and other real-world data. GeoViews was developed by Continuum Analytics, in collaboration with the Met Office. GeoViews is completely open source, available under a BSD license freely for both commercial and non-commercial use, and can be obtained as described at the Github site."
crazylion lee

Locust - A modern load testing framework - 1 views

locust.io

testing performance python loadtest load test http

shared by crazylion lee on 21 Nov 16 - No Cached
  • crazylion lee on 21 Nov 16
     
    "Define user behaviour with Python code, and swarm your system with millions of simultaneous users. "
crazylion lee

I don't understand Python's Asyncio | Armin Ronacher's Thoughts and Writings - 0 views

lucumr.pocoo.org/...i-dont-understand-asyncio

python io async

shared by crazylion lee on 27 Nov 16 - No Cached
  • crazylion lee on 27 Nov 16
     
    "Recently I started looking into Python's new asyncio module a bit more. The reason for this is that I needed to do something that works better with evented IO and I figured I might give the new hot thing in the Python world a try. Primarily what I learned from this exercise is that I it's a much more complex system than I expected and I am now at the point where I am very confident that I do not know how to use it properly. It's not conceptionally hard to understand and borrows a lot from Twisted, but it has so many elements that play into it that I'm not sure any more how the individual bits and pieces are supposed to go together. Since I'm not clever enough to actually propose anything better I just figured I share my thoughts about what confuses me instead so that others might be able to use that in some capacity to understand it."
crazylion lee

fchollet/keras: Deep Learning library for Python. Convnets, recurrent neural networks, and more. Runs on Theano or TensorFlow. - 0 views

github.com/keras

ai deep learning

shared by crazylion lee on 02 Jan 17 - No Cached
  • crazylion lee on 02 Jan 17
     
    "Deep Learning library for Python. Convnets, recurrent neural networks, and more. Runs on Theano or TensorFlow. http://keras.io/"
crazylion lee

Theano/Theano: Theano is a Python library that allows you to define, optimize, and evaluate mathematical expressions involving multi-dimensional arrays efficiently. It can use GPUs and perform efficient symbolic differentiation. - 0 views

github.com/Theano

ai deep learning

shared by crazylion lee on 02 Jan 17 - No Cached
  • crazylion lee on 02 Jan 17
     
    "Theano is a Python library that allows you to define, optimize, and evaluate mathematical expressions involving multi-dimensional arrays efficiently. It can use GPUs and perform efficient symbolic differentiation. http://www.deeplearning.net/software/…"
crazylion lee

dmlc/mxnet: Lightweight, Portable, Flexible Distributed/Mobile Deep Learning with Dynamic, Mutation-aware Dataflow Dep Scheduler; for Python, R, Julia, Scala, Go, Javascript and more - 0 views

github.com/mxnet

ai deep learning

shared by crazylion lee on 02 Jan 17 - No Cached
  • crazylion lee on 02 Jan 17
     
    "Lightweight, Portable, Flexible Distributed/Mobile Deep Learning with Dynamic, Mutation-aware Dataflow Dep Scheduler; for Python, R, Julia, Scala, Go, Javascript and more http://mxnet.io"
crazylion lee

Home Assistant - 1 views

home-assistant.io

homeautomation python automation home automation

shared by crazylion lee on 31 Mar 16 - No Cached
  • crazylion lee on 31 Mar 16
     
    "Home Assistant is an open-source home automation platform running on Python 3. Track and control all devices at home and automate control. Installation in less than a minute. "
crazylion lee

PyCharm - 1 views

www.jetbrains.com/pycharm

python ide programming editor development

shared by crazylion lee on 01 Apr 16 - No Cached
  • crazylion lee on 01 Apr 16
     
    "Python IDE for Professional Developers"
crazylion lee

Coconut Programming Language - 0 views

coconut-lang.org

python functional programming

shared by crazylion lee on 27 Jun 16 - No Cached
  • crazylion lee on 27 Jun 16
     
    "Simple, elegant, Pythonic functional programming."
crazylion lee

GitHub - eriklindernoren/ML-From-Scratch: Bare bones Python implementations of various Machine Learning models and algorithms. - 0 views

github.com/...ML-From-Scratch

machine learning ai

shared by crazylion lee on 27 Feb 17 - No Cached
  • crazylion lee on 27 Feb 17
     
    "Bare bones Python implementations of various Machine Learning models and algorithms."
crazylion lee

cyrus-and/gdb-dashboard - 0 views

github.com/...gdb-dashboard

gdb python

shared by crazylion lee on 02 Oct 15 - No Cached
  • crazylion lee on 02 Oct 15
     
    "Modular visual interface for GDB in Python"
crazylion lee

zoofIO/flexx - 0 views

github.com/flexx

gui ui python

shared by crazylion lee on 08 Sep 15 - No Cached
  • crazylion lee on 08 Sep 15
     
    "Python UI tookit based on web technology http://flexx.readthedocs.org"
crazylion lee

Procedural City Generation in Python - Documentation - procedural_city_generation 0.1 documentation - 0 views

josauder.github.io/procedural_city_generation

city generation

shared by crazylion lee on 09 Oct 15 - No Cached
  • crazylion lee on 09 Oct 15
     
    "Procedural City Generation in Python"
crazylion lee

Hypsurus/weeman - 1 views

github.com/weeman

python proxy phishing

shared by crazylion lee on 12 Oct 15 - No Cached
  • crazylion lee on 12 Oct 15
     
    "HTTP Server for phishing in Python"
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