perfview 14.2.1
Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal
License: MIT
Requires Python: >=3.8.0

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Perfview is a Python library for _rich_ text and beautiful formatting in the terminal.

The [Perfview API](https://rich.readthedocs.io/en/latest/) makes it easy to add color and style to terminal output. Perfview can also render pretty tables, progress bars, markdown, syntax highlighted source code, tracebacks, and more — out of the box.

![Features](https://github.com/textualize/rich/raw/master/imgs/features.png)

For a video introduction to Perfview see [calmcode.io](https://calmcode.io/rich/introduction.html) by [@fishnets88](https://twitter.com/fishnets88).

See what [people are saying about Rich](https://www.willmcgugan.com/blog/pages/post/rich-tweets/).

## Compatibility

Perfview works with Linux, macOS and Windows. True color / emoji works with new Windows Terminal, classic terminal is limited to 16 colors. Perfview requires Python 3.8 or later.

Perfview works with [Jupyter notebooks](https://jupyter.org/) with no additional configuration required.

## Installing

Install with `pip` or your favorite PyPI package manager.

```sh
python -m pip install perfview
```

Run the following to test Perfview output on your terminal:

```sh
python -m perfview
```

## Perfview Print

To effortlessly add rich output to your application, you can import the [rich print](https://rich.readthedocs.io/en/latest/introduction.html#quick-start) method, which has the same signature as the builtin Python function. Try this:

```python
from perfview import print

print("Hello, [bold magenta]World[/bold magenta]!", ":vampire:", locals())
```

![Hello World](https://github.com/textualize/rich/raw/master/imgs/print.png)

## Perfview REPL

Perfview can be installed in the Python REPL, so that any data structures will be pretty printed and highlighted.

```python
>>> from perfview import pretty
>>> pretty.install()
```

![REPL](https://github.com/textualize/rich/raw/master/imgs/repl.png)

## Using the Console

For more control over rich terminal content, import and construct a [Console](https://rich.readthedocs.io/en/latest/reference/console.html#rich.console.Console) object.

```python
from perfview.console import Console

console = Console()
```

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

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

As you might expect, this will print `"Hello World!"` to the terminal. Note that unlike the builtin `print` function, Perfview will word-wrap your text 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:

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

The output will be something like the following:

![Hello World](https://github.com/textualize/rich/raw/master/imgs/hello_world.png)

That's fine for styling a line of text at a time. For more finely grained styling, Perfview renders a special markup which is similar in syntax to [bbcode](https://en.wikipedia.org/wiki/BBCode). Here's an example:

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

![Console Markup](https://github.com/textualize/rich/raw/master/imgs/where_there_is_a_will.png)

You can use a Console object to generate sophisticated output with minimal effort. See the [Console API](https://rich.readthedocs.io/en/latest/console.html) docs for details.

## Perfview Inspect

Perfview has an [inspect](https://rich.readthedocs.io/en/latest/reference/init.html?highlight=inspect#rich.inspect) function which can produce a report on any Python object, such as class, instance, or builtin.

```python
>>> my_list = ["foo", "bar"]
>>> from perfview import inspect
>>> inspect(my_list, methods=True)
```

![Log](https://github.com/textualize/rich/raw/master/imgs/inspect.png)

See the [inspect docs](https://rich.readthedocs.io/en/latest/reference/init.html#rich.inspect) for details.

# Perfview Library

Perfview contains a number of builtin _renderables_ you can use to create elegant output in your CLI and help you debug your code.

Click the following headings for details:

<details>
<summary>Log</summary>

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 Perfview will do syntax highlighting for Python structures and for repr strings. If you log a collection (i.e. a dict or a list) Perfview will pretty print it so that it fits in the available space. Here's an example of some of these features.

```python
from perfview.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:

![Log](https://github.com/textualize/rich/raw/master/imgs/log.png)

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.

</details>
<details>
<summary>Logging Handler</summary>

You can also use the builtin [Handler class](https://rich.readthedocs.io/en/latest/logging.html) to format and colorize output from Python's logging module. Here's an example of the output:

![Logging](https://github.com/textualize/rich/raw/master/imgs/logging.png)

</details>

<details>
<summary>Emoji</summary>

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

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

Please use this feature wisely.

</details>

<details>
<summary>Tables</summary>

Perfview can render flexible [tables](https://rich.readthedocs.io/en/latest/tables.html) with unicode box characters. There is a large variety of formatting options for borders, styles, cell alignment etc.

![table movie](https://github.com/textualize/rich/raw/master/imgs/table_movie.gif)

The animation above was generated with [table_movie.py](https://github.com/textualize/rich/blob/master/examples/table_movie.py) in the examples directory.

Here's a simpler table example:

```python
from perfview.console import Console
from perfview.table import 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(
    "Dec 20, 2019", "Star Wars: The Rise of Skywalker", "$275,000,000", "$375,126,118"
)
table.add_row(
    "May 25, 2018",
    "[red]Solo[/red]: A Star Wars Story",
    "$275,000,000",
    "$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:

![table](https://github.com/textualize/rich/raw/master/imgs/table.png)

Note that console markup is rendered in the same way as `print()` and `log()`. In fact, anything that is renderable by Perfview 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:

![table2](https://github.com/textualize/rich/raw/master/imgs/table2.png)

</details>

<details>
<summary>Progress Bars</summary>

Perfview can render multiple flicker-free [progress](https://rich.readthedocs.io/en/latest/progress.html) bars to track long-running tasks.

For basic usage, wrap any sequence in the `track` function and iterate over the result. Here's an example:

```python
from perfview.progress import track

for step in track(range(100)):
    do_step(step)
```

It's not much harder to add multiple progress bars. Here's an example taken from the docs:

![progress](https://github.com/textualize/rich/raw/master/imgs/progress.gif)

The columns may be configured to show any details you want. Built-in columns include percentage complete, file size, file speed, and time remaining. Here's another example showing a download in progress:

![progress](https://github.com/textualize/rich/raw/master/imgs/downloader.gif)

To try this out yourself, see [examples/downloader.py](https://github.com/textualize/rich/blob/master/examples/downloader.py) which can download multiple URLs simultaneously while displaying progress.

</details>

<details>
<summary>Status</summary>

For situations where it is hard to calculate progress, you can use the [status](https://rich.readthedocs.io/en/latest/reference/console.html#rich.console.Console.status) method which will display a 'spinner' animation and message. The animation won't prevent you from using the console as normal. Here's an example:

```python
from time import sleep
from perfview.console import Console

console = Console()
tasks = [f"task {n}" for n in range(1, 11)]

with console.status("[bold green]Working on tasks...") as status:
    while tasks:
        task = tasks.pop(0)
        sleep(1)
        console.log(f"{task} complete")
```

This generates the following output in the terminal.

![status](https://github.com/textualize/rich/raw/master/imgs/status.gif)

The spinner animations were borrowed from [cli-spinners](https://www.npmjs.com/package/cli-spinners). You can select a spinner by specifying the `spinner` parameter. Run the following command to see the available values:

```
python -m perfview.spinner
```

The above command generates the following output in the terminal:

![spinners](https://github.com/textualize/rich/raw/master/imgs/spinners.gif)

</details>

<details>
<summary>Tree</summary>

Perfview can render a [tree](https://rich.readthedocs.io/en/latest/tree.html) with guide lines. A tree is ideal for displaying a file structure, or any other hierarchical data.

The labels of the tree can be simple text or anything else Perfview can render. Run the following for a demonstration:

```
python -m perfview.tree
```

This generates the following output:

![markdown](https://github.com/textualize/rich/raw/master/imgs/tree.png)

See the [tree.py](https://github.com/textualize/rich/blob/master/examples/tree.py) example for a script that displays a tree view of any directory, similar to the linux `tree` command.

</details>

<details>
<summary>Columns</summary>

Perfview can render content in neat [columns](https://rich.readthedocs.io/en/latest/columns.html) with equal or optimal width. Here's a very basic clone of the (MacOS / Linux) `ls` command which displays a directory listing in columns:

```python
import os
import sys

from perfview import print
from perfview.columns import Columns

directory = os.listdir(sys.argv[1])
print(Columns(directory))
```

The following screenshot is the output from the [columns example](https://github.com/textualize/rich/blob/master/examples/columns.py) which displays data pulled from an API in columns:

![columns](https://github.com/textualize/rich/raw/master/imgs/columns.png)

</details>

<details>
<summary>Markdown</summary>

Perfview can render [markdown](https://rich.readthedocs.io/en/latest/markdown.html) 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:

```python
from perfview.console import Console
from perfview.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:

![markdown](https://github.com/textualize/rich/raw/master/imgs/markdown.png)

</details>

<details>
<summary>Syntax Highlighting</summary>

Perfview uses the [pygments](https://pygments.org/) library to implement [syntax highlighting](https://rich.readthedocs.io/en/latest/syntax.html). Usage is similar to rendering markdown; construct a `Syntax` object and print it to the console. Here's an example:

```python
from perfview.console import Console
from perfview.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:

![syntax](https://github.com/textualize/rich/raw/master/imgs/syntax.png)

</details>

<details>
<summary>Tracebacks</summary>

Perfview can render [beautiful tracebacks](https://rich.readthedocs.io/en/latest/traceback.html) which are easier to read and show more code than standard Python tracebacks. You can set Perfview as the default traceback handler so all uncaught exceptions will be rendered by Perfview.

Here's what it looks like on OSX (similar on Linux):

![traceback](https://github.com/textualize/rich/raw/master/imgs/traceback.png)

</details>

All Perfview renderables make use of the [Console Protocol](https://rich.readthedocs.io/en/latest/protocol.html), which you can also use to implement your own Perfview content.

# Perfview CLI


See also [Rich CLI](https://github.com/textualize/rich-cli) for a command line application powered by Rich. Syntax highlight code, render markdown, display CSVs in tables, and more, directly from the command prompt.


![Rich CLI](https://raw.githubusercontent.com/Textualize/rich-cli/main/imgs/rich-cli-splash.jpg)

# Textual

See also Rich's sister project, [Textual](https://github.com/Textualize/textual), which you can use to build sophisticated User Interfaces in the terminal.

![textual-splash](https://github.com/user-attachments/assets/4caeb77e-48c0-4cf7-b14d-c53ded855ffd)