yaspin: Yet Another Terminal Spinner for Python

Yaspin provides a full-featured terminal spinner to show the progress during long-hanging operations.

It is easy to integrate into existing codebase by using it as a context manager or as a function decorator:

import time
from yaspin import yaspin

# Context manager:
with yaspin():
    time.sleep(3)  # time consuming code

# Function decorator:
@yaspin(text="Loading...")
def some_operations():
    time.sleep(3)  # time consuming code

some_operations()

Yaspin also provides an intuitive and powerful API. For example, you can easily summon a shark:

import time
from yaspin import yaspin

with yaspin().white.bold.shark.on_blue as sp:
    sp.text = "White bold shark in a blue sea"
    time.sleep(5)

Features

• No external dependencies
• Runs at all major CPython versions (2.7, 3.4, 3.5, 3.6, 3.7), PyPy and PyPy3
• Supports all (60+) spinners from cli-spinners
• Supports all colors, highlights, attributes and their mixes from termcolor library
• Easy to combine with other command-line libraries, e.g. prompt-toolkit
• Flexible API, easy to integrate with existing code
• User-friendly API for handling POSIX signals
• Safe pipes and redirects:

$ python script_that_uses_yaspin.py > script.log
$ python script_that_uses_yaspin.py | grep ERROR

Installation

From PyPI using pip package manager:

pip install --upgrade yaspin

Or install the latest sources from GitHub:

pip install https://github.com/pavdmyt/yaspin/archive/master.zip

Usage

Basic Example

# -*- coding: utf-8 -*-
import time
from random import randint
from yaspin import yaspin

with yaspin(text="Loading", color="yellow") as spinner:
    time.sleep(2)  # time consuming code

    success = randint(0, 1)
    if success:
        spinner.ok("✅ ")
    else:
        spinner.fail("💥 ")

It is also possible to control spinner manually:

# -*- coding: utf-8 -*-
import time
from yaspin import yaspin

spinner = yaspin()
spinner.start()

time.sleep(3)  # time consuming tasks

spinner.stop()

Run any spinner from cli-spinners

# -*- coding: utf-8 -*-
import time
from yaspin import yaspin
from yaspin.spinners import Spinners

with yaspin(Spinners.earth, text="Earth") as sp:
    time.sleep(2)                # time consuming code

    # change spinner
    sp.spinner = Spinners.moon
    sp.text = "Moon"

    time.sleep(2)                # time consuming code

Any Colour You Like 🌈

# -*- coding: utf-8 -*-
import time
from yaspin import yaspin

with yaspin(text="Colors!") as sp:
    # Support all basic termcolor text colors
    colors = ("red", "green", "yellow", "blue", "magenta", "cyan", "white")

    for color in colors:
        sp.color, sp.text = color, color
        time.sleep(1)

Advanced colors usage

# -*- coding: utf-8 -*-
import time
from yaspin import yaspin
from yaspin.spinners import Spinners

text = "Bold blink magenta spinner on cyan color"
with yaspin().bold.blink.magenta.bouncingBall.on_cyan as sp:
    sp.text = text
    time.sleep(3)

# The same result can be achieved by passing arguments directly
with yaspin(
    Spinners.bouncingBall,
    color="magenta",
    on_color="on_cyan",
    attrs=["bold", "blink"],
) as sp:
    sp.text = text
    time.sleep(3)

Run any spinner you want

# -*- coding: utf-8 -*-
import time
from yaspin import yaspin, Spinner

# Compose new spinners with custom frame sequence and interval value
sp = Spinner(["😸", "😹", "😺", "😻", "😼", "😽", "😾", "😿", "🙀"], 200)

with yaspin(sp, text="Cat!"):
    time.sleep(3)  # cat consuming code :)

Change spinner properties on the fly

# -*- coding: utf-8 -*-
import time
from yaspin import yaspin
from yaspin.spinners import Spinners

with yaspin(Spinners.noise, text="Noise spinner") as sp:
    time.sleep(2)

    sp.spinner = Spinners.arc  # spinner type
    sp.text = "Arc spinner"    # text along with spinner
    sp.color = "green"         # spinner color
    sp.side = "right"          # put spinner to the right
    sp.reversal = True         # reverse spin direction

    time.sleep(2)

Writing messages

You should not write any message in the terminal using print while spinner is open. To write messages in the terminal without any collision with yaspin spinner, a .write() method is provided:

# -*- coding: utf-8 -*-
import time
from yaspin import yaspin

with yaspin(text="Downloading images", color="cyan") as sp:
    # task 1
    time.sleep(1)
    sp.write("> image 1 download complete")

    # task 2
    time.sleep(2)
    sp.write("> image 2 download complete")

    # finalize
    sp.ok("✔")

Integration with other libraries

Utilizing hide and show methods it is possible to toggle the display of the spinner in order to call custom methods that write to the terminal. This is helpful for allowing easy usage in other frameworks like prompt-toolkit. Using the powerful print_formatted_text function allows you even to apply HTML formats and CSS styles to the output:

# -*- coding: utf-8 -*-
from __future__ import print_function

import sys
import time

from yaspin import yaspin
from prompt_toolkit import HTML, print_formatted_text
from prompt_toolkit.styles import Style

# override print with feature-rich ``print_formatted_text`` from prompt_toolkit
print = print_formatted_text

# build a basic prompt_toolkit style for styling the HTML wrapped text
style = Style.from_dict({
    'msg': '#4caf50 bold',
    'sub-msg': '#616161 italic'
})


with yaspin(text='Downloading images') as sp:
    # task 1
    time.sleep(1)
    sp.hide()
    print(HTML(
        u'<b>></b> <msg>image 1</msg> <sub-msg>download complete</sub-msg>'
    ), style=style)
    sp.show()

    # task 2
    time.sleep(2)
    sp.hide()
    print(HTML(
        u'<b>></b> <msg>image 2</msg> <sub-msg>download complete</sub-msg>'
    ), style=style)
    sp.show()

    # finalize
    sp.ok()

Handling POSIX signals

Handling keyboard interrupts (pressing Control-C):

# -*- coding: utf-8 -*-
import time

from yaspin import kbi_safe_yaspin


with kbi_safe_yaspin(text="Press Control+C to send SIGINT (Keyboard Interrupt) signal"):
    time.sleep(5)  # time consuming code

Handling other types of signals:

# -*- coding: utf-8 -*-
import os
import time
from signal import SIGTERM, SIGUSR1

from yaspin import yaspin
from yaspin.signal_handlers import default_handler, fancy_handler


sigmap = {SIGUSR1: default_handler, SIGTERM: fancy_handler}
with yaspin(sigmap=sigmap, text="Handling SIGUSR1 and SIGTERM signals") as sp:
    sp.write("Send signals using `kill` command")
    sp.write("E.g. $ kill -USR1 {0}".format(os.getpid()))
    time.sleep(20)  # time consuming code

More examples.

Development

Clone the repository:

git clone https://github.com/pavdmyt/yaspin.git

Install dev dependencies:

pipenv install --dev

Lint code:

make lint

Format code:

make black-fmt

Run tests:

make test

Contributing

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -m 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request
6. Make sure tests are passing

License

• MIT - Pavlo Dmytrenko; https://twitter.com/pavdmyt
• Contains termcolor package: MIT License, Copyright (c) 2008-2011 Volvox Development Team
• Contains data from cli-spinners: MIT License, Copyright (c) Sindre Sorhus [email protected] (sindresorhus.com)