rich/README.md

Note: This library is currently work in progress. Documentation and tests are coming.

Rich

Rich is a Python library for rich text and high level formatting in the terminal.

The Rich API make it easy to add colored text (up to 16.7million colors) and styles (bold, italic, underline etc.) to your script or application. Rich can also render pretty tables, markdown and source code with syntax highlighting.

Installing

Install with pip or your favorite PyPi package manager.

pip install rich

Console Printing

The first step to using the rich console is to import and construct the Console object.

from rich.console import Console

console = Console()

Most applications will require one Console instance. The easiest way to manage your console instance would be to construct an instance at the module level and import it where needed.

The Console object has a print method which has an intentionally similar interface to the builtin print function. Here's an example of use:

console.print("Hello", "World!")

As you might expect, this will print "Hello World!" to the terminal. Note that unlike the print function, Rich will word-wrap your test to fit within the terminal width.

There are a few ways of adding color and style to your output. You can set a style for the entire output by adding a style keyword argument. Here's an example:

console.print("Hello", "World!", style="bold red")

The output will be something like the following:

That's fine for styling a line of text at a time. For more finely grained styling, Rich renders a special markup which is similar in syntax to bbcode. Here's an example:

console.print("Where there is a [bold cyan]Will[/bold cyan] there [u]is[/u] a [i]way[/i].")

Console Logging

The Console object has a log() method which has a similar interface to print(), but also renders a column for the current time and the file and line which made the call. By default, Rich will do syntax highlighting for Python structures and for repr strings. If you log a collection (i.e. a dict or a list) Rich will pretty print it so that it fits in the available space. Here's an example of some of these features.

from rich.console import Console
console = Console()

test_data = [
    {"jsonrpc": "2.0", "method": "sum", "params": [None, 1, 2, 4, False, True], "id": "1",},
    {"jsonrpc": "2.0", "method": "notify_hello", "params": [7]},
    {"jsonrpc": "2.0", "method": "subtract", "params": [42, 23], "id": "2"},
]

def test_log():
    enabled = False
    context = {
        "foo": "bar",
    }
    movies = ["Deadpool", "Rise of the Skywalker"]
    console.log("Hello from", console, "!")
    console.log(test_data, log_locals=True)


test_log()

The above produces the following output:

Note the log_locals argument, which outputs a table containing the local variables where the log method was called.

The log method could be used for logging to the terminal for long running applications such as servers, but is also a very nice debugging aid.

Emoji

To insert an emoji in to console output place the name between two colons. Here's an example:

>>> console.print(":smiley: :vampire: :pile_of_poo: :thumbs_up: :raccoon:")
😃 🧛 💩 👍 🦝

Please use this feature wisely.

Markdown

Rich can render markdown and does a reasonable job of translating the formatting to the terminal.

To render markdown import the Markdown class and construct it with a string containing markdown code. Then print it to the console. Here's an example:

from rich.console import Console
from rich.markdown import Markdown

console = Console()
with open("README.md") as readme:
    markdown = Markdown(readme.read())
console.print(markdown)

This will produce output something like the following:

Syntax Highlighting

Rich uses the pygments library to implement syntax highlighting. Usage is similar to rendering markdown; construct a Syntax object and print it to the console. Here's an example:

from rich.console import Console
from rich.syntax import Syntax

my_code = '''
def iter_first_last(values: Iterable[T]) -> Iterable[Tuple[bool, bool, T]]:
    """Iterate and generate a tuple with a flag for first and last value."""
    iter_values = iter(values)
    try:
        previous_value = next(iter_values)
    except StopIteration:
        return
    first = True
    for value in iter_values:
        yield first, False, previous_value
        first = False
        previous_value = value
    yield first, True, previous_value
'''
syntax = Syntax(my_code, "python", theme="monokai", line_numbers=True)
console = Console()
console.print(syntax)

This will produce the following output:

Tables

Rich can render flexible tables with unicode box characters. There is a large variety of formatting options for borders, styles, cell alignment etc. Here's a simple example:

from rich.console import Console
from rich.table import Column, Table

console = Console()

table = Table(show_header=True, header_style="bold magenta")
table.add_column("Date", style="dim", width=12)
table.add_column("Title")
table.add_column("Production Budget", justify="right")
table.add_column("Box Office", justify="right")
table.add_row(
    "Dev 20, 2019", "Star Wars: The Rise of Skywalker", "$275,000,0000", "$375,126,118"
)
table.add_row(
    "May 25, 2018",
    "[red]Solo[/red]: A Star Wars Story",
    "$275,000,0000",
    "$393,151,347",
)
table.add_row(
    "Dec 15, 2017",
    "Star Wars Ep. VIII: The Last Jedi",
    "$262,000,000",
    "[bold]$1,332,539,889[/bold]",
)

console.print(table)

This produces the following output:

Note that console markup is rendered in the same was as print() and log(). In fact, anything that is renderable by Rich may be included in the headers / rows (even other tables).

The Table class is smart enough to resize columns to fit the available width of the terminal, wrapping text as required. Here's the same example, with the terminal made smaller than the table above: