Python Print Markdown

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  1. Python Print Markdown Function
  2. Long Line In Python Markdown

Split the file into yaml and markdown parts; Extract the meta-data from the YAML. Convert the markdown to an HTML fragment (the page content). Combine the meta-data and page content with the HTML template to create a complete HTML file. Fortunately, if we use the right Python libraries, each of these steps is very easy. Splitting the file. Def function: #indenting works just fine in the fenced code block s = 'Python syntax highlighting' print s require 'redcarpet' markdown = Redcarpet.new('Hello World!' ) puts markdown.tohtml No language indicated, so no syntax highlighting. S = 'There is no highlighting for this.' But let's throw in a tag. The Python support in R Markdown and knitr is based on the reticulate package (Ushey, Allaire, and Tang 2020), and one important feature of this package is that it allows two-way communication between Python and R. For example, you may access or create Python.

Latest version

Released:

The fastest markdown parser in pure Python

Project description

The fastest markdown parser in pure Python with renderer features,inspired by marked.

Features

  • Pure Python. Tested in Python 2.7, Python 3.5+ and PyPy.
  • Very Fast. It is the fastest in all pure Python markdown parsers.
  • More Features. Table, footnotes, autolink, fenced code etc.

View the benchmark results.

Installation

Installing mistune with pip:

Mistune can be faster, if you compile with cython:

Basic Usage

A simple API that render a markdown formatted text:

If you care about performance, it is better to re-use the Markdown instance:

Mistune has enabled all features by default. You don’t have to configureanything. But there are options for you to change the parser behaviors.

Options

Here is a list of all options that will affect the rendering results,configure them with mistune.Renderer:

  • escape: if set to False, all raw html tags will not be escaped.
  • hard_wrap: if set to True, it will has GFM line breaks feature.All new lines will be replaced with <br> tag
  • use_xhtml: if set to True, all tags will be in xhtml, for example: <hr />.
  • parse_block_html: parse text only in block level html.
  • parse_inline_html: parse text only in inline level html.

When using the default renderer, you can use one of the following shortcuts:

Renderer

Like misaka/sundown, you can influence the rendering by custom renderers.All you need to do is subclassing a Renderer class.

Here is an example of code highlighting:

Find more renderers in mistune-contrib.

Block Level

Here is a list of block level renderer API:

The flags tells you whether it is header with flags['header']. And italso tells you the align with flags['align'].

Span Level

Here is a list of span level renderer API:

Footnotes

Here is a list of renderers related to footnotes:

Lexers

Sometimes you want to add your own rules to Markdown, such as GitHub Wikilinks. You can’t achieve this goal with renderers. You will need to dealwith the lexers, it would be a little difficult for the first time.

We will take an example for GitHub Wiki links: [[Page 2 Page 2]].It is an inline grammar, which requires custom InlineGrammar andInlineLexer:

You should pass the inline lexer to Markdown parser:

It is the same with block level lexer. It would take a while to understandthe whole mechanism. But you won’t do the trick a lot.

Contribution & Extensions

Mistune itself doesn’t accept any extension. It will always be a simple onefile script.

If you want to add features, you can head over to mistune-contrib.

Here are some extensions already in mistune-contrib:

  • Math/MathJax features
  • Highlight Code Renderer
  • TOC table of content features
  • MultiMarkdown Metadata parser

Get inspired with the contrib repository.

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Storing user-created articles in your database as Markdown Syntax instead of the final rendered HTML solves so many problems. It’s not only more secure and helps you prevent XSS injections into your content, but it also makes it much more flexible to change the rendered version of the content at a later stage in the lifetime of your application.

This article that you’re reading right now has been written using Markdown Syntax. That’s how it’s being stored in the database, and then whenever you visit this page where the article is stored, Python code converts it into HTML and then add custom features such as classes, ids or other HTML attributes to selected elements, and then serves it to your browser.

This means that the creation of the content is strictly separated and decoupled from how it’s being rendered in its final form. Separating the logic related to the content in this manner brings many different benefits compared to creating the content using a WYSIWYG HTML Editor.

What’s Wrong with WYSIWYG HTML Editors?

For example, let’s say that we use a WYSIWYG HTML Editor to allow users to create their content. We then store this HTML in our database and serve it straight from the database whenever a user visits the page of the article. This setup means that we have to be concerned about the following things:

  • Javascript injections into the content.
  • A non-standardized look of articles and content.
  • How the stored content will adapt to future changes to our design.
  • Invalid HTML Markup.

What if we later realize that we want to modify the HTML of our articles? For example, let’s say that we want all <table> elements to have a certain class, or we want all links to be rel='nofollow', or we want all headlines to have an id attribute so that we can link to them?

We already stored the HTML and we are expecting to be able to use it straight from the database, so any kind of change or feature that we want to add that is related to our content would require us to write scripts or queries that updates the stored HTML from previous articles.

It quite quickly becomes tiresome and prone to mistakes and bugs, and it might lead to the developer avoiding updating older content, which in turn leads to our website having non-standardized formatting of the articles.

How to Use Markdown Syntax with Python

For most things you can think of, there is a python library available for it. So is naturally also the case for Markdown. There is a library called Python-Markdown that can easily be installed with pip using the following command:

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The library offers multiple useful methods and tools for when it comes to working with strings that are formatted using Markdown Syntax. For example, we can easily turn Markdown into HTML with a single method call.

The Markdown library also comes with the ability to add different types of extensions that modify the behavior or the way that markdown parse the Markdown Syntax. For example, you can modify how lists are parsed using the Sane Lists extension, or you can add code highlights of any <code> block using the CodeHilite extension.

Add Code Highlights using the CodeHilite Markdown Extension

So let’s illustrate how you can activate an extension for the markdown library to modify the way it generates HTML out of your Markdown Syntax. In this case, we will add code highlights to <code> blocks that match the programming language that is being used.

If we don’t install any extension, code blocks are generated in the following manner:

Gets rendered as:

So technically, it works. It does understand that it is a code block and it wraps it as a <code> element. But what if we want to add highlights so that different syntax is colored in different colors, to improve the readability for the visitors that come to read our articles?

We might want to wrap the print( part with a <span> to make it red, and then wrap the string within with a <span> that turn it into a green color. It would be a mess to attempt to do all of this by hand, and this is exactly the kind of things that the “CodeHilite” extension does for us.

To be able to enable the extension, we first have to install its dependency Pygments. Pygments is a popular syntax highlighter written in python and it is what takes care of the bulk of the work that the CodeHilite extension does. We can install it using pip.

To enable the CodeHilite extension, all we have to do is to add the extensions kwarg to our markdown() call that turn our Markdown Syntax into HTML.

This then wraps our code into the following HTML syntax:

But obviously, just wrapping things in <span> elements doesn’t do much. What does class='k' or class='p' even mean? Where are those styles defined? Well for this we have to import a CSS stylesheet that defines all of the style rules required.

To do this, we can either generate our own styles which are documented in the CodeHilite Documentation by using the following command:

The command will generate a styles.css file for us that is populated with style rules that expect the code highlighting to be wrapped in a container with the .codehilite class.

The other alternative is to check out GitHub user richleland who have created multiple presets that follow common IDE styles that we can use.

How to Modify Markdown’s Generated HTML with BeautifulSoup

So now we have installed the markdown library and we’ve learned how to add extensions that modify some of the generated HTML. But what if we also want to add our own custom attribute to different HTML elements?

For example, right now a user can create an HTML link using the Markdown Syntax. By default the HTML element is just a pure <a> element. But what if we want to add rel='nofollow' or target='_blank' to each link?

Well, we could create a Markdown Extension to achieve this, but we can also use something like BeautifulSoup4 to parse and modify the HTML that has been generated before we serve it to the user. This gives us a lot of choices and possibilities to add anything we’d like to our final output.

Install BeautifulSoup4

BeautifulSoup4 is a super popular library that gives the developer an amazing set of tools to easily parse and modify HTML. It’s both being used by web crawlers to understand contents of websites, but it can also be used by us to read and modify HTML elements on the fly before it’s served to our users.

We can install BeautifulSoup4 using pip.

We are then ready to use it in our code by importing it as:

Use BeautifulSoup to Modify HTML In-Place

So let’s take the example that we used in the section above regarding modifying <a> elements and add things such as target='_blank' or rel='nofollow' attributes to it.

Here’s an example of how this could be achieved:

This will then do the following things:

  • Use the markdown library to turn our Markdown Syntax to HTML.
  • Use the codehilite extension to add Code highlights to any code blocks.
  • Turn the HTML into a BeautifulSoup object that allows us to easily search and iterate through it.
  • Add rel and target attributes to all HTML <a> elements. This all happens in-place.
  • Finally turn the BeautifulSoup object into HTML and return it.

It’s easy to imagine a lot of other things you can achieve with this combination of tools such as:

  • Make all images responsive by adding img-fluid Boostrap classes to them.
  • Add title and alt tags to images and links to improve On-Page SEO.
  • Treat internal links and external links differently and set different rel values depending on where they link.
  • Add id to elements so that they can be anchored and linked to.

Benefits and Conclusion of Markdown Syntax over HTML WYSIWYG

This style of working and storing content is the way that this website stores and manage the content of all articles. It has many different benefits over the traditional WYSIWYG method where you store the final HTML ready to be served.

Python Print Markdown Function

  • We have more control of the HTML that we output since we process it before rendering it. It’s not completely in the hands of the users.
  • Users can focus more on the content they produce, than how it is supposed to look like in its final form.
  • Since we never allow users to input raw HTML, we can treat it all as unsafe and completely prevent things like Javascript injections.
  • All of our articles will always look the same and follow the same style guides. We will never have an article that has a different font size on one of their headlines than another.

Some people argue that Markdown Syntax is more difficult to learn than using WYSIWYG HTML Editors. This is simply not true. First of all, you can use editors for Markdown Syntax as well that allow you to have shortcuts to do things like bold text, add links or upload images.

Second of all, Markdown Syntax is no doubt simpler than HTML and XML.

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Long Line In Python Markdown

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