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Text progress bar library for Python.
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Build status:

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    :alt: python-progressbar test status 
    :target: https://github.com/WoLpH/python-progressbar/actions

Coverage:

.. image:: https://coveralls.io/repos/WoLpH/python-progressbar/badge.svg?branch=master
  :target: https://coveralls.io/r/WoLpH/python-progressbar?branch=master

******************************************************************************
Install
******************************************************************************

The package can be installed through `pip` (this is the recommended method):

    pip install progressbar2

Or if `pip` is not available, `easy_install` should work as well:

    easy_install progressbar2

Or download the latest release from Pypi (https://pypi.python.org/pypi/progressbar2) or Github.

Note that the releases on Pypi are signed with my GPG key (https://pgp.mit.edu/pks/lookup?op=vindex&search=0xE81444E9CE1F695D) and can be checked using GPG:

     gpg --verify progressbar2-<version>.tar.gz.asc progressbar2-<version>.tar.gz

******************************************************************************
Introduction
******************************************************************************

A text progress bar is typically used to display the progress of a long
running operation, providing a visual cue that processing is underway.

The progressbar is based on the old Python progressbar package that was published on the now defunct Google Code. Since that project was completely abandoned by its developer and the developer did not respond to email, I decided to fork the package. This package is still backwards compatible with the original progressbar package so you can safely use it as a drop-in replacement for existing project.

The ProgressBar class manages the current progress, and the format of the line
is given by a number of widgets. A widget is an object that may display
differently depending on the state of the progress bar. There are many types
of widgets:

 - `AbsoluteETA <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#AbsoluteETA>`_
 - `AdaptiveETA <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#AdaptiveETA>`_
 - `AdaptiveTransferSpeed <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#AdaptiveTransferSpeed>`_
 - `AnimatedMarker <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#AnimatedMarker>`_
 - `Bar <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#Bar>`_
 - `BouncingBar <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#BouncingBar>`_
 - `Counter <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#Counter>`_
 - `CurrentTime <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#CurrentTime>`_
 - `DataSize <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#DataSize>`_
 - `DynamicMessage <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#DynamicMessage>`_
 - `ETA <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#ETA>`_
 - `FileTransferSpeed <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#FileTransferSpeed>`_
 - `FormatCustomText <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#FormatCustomText>`_
 - `FormatLabel <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#FormatLabel>`_
 - `FormatLabelBar <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#FormatLabel>`_
 - `GranularBar <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#GranularBar>`_
 - `Percentage <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#Percentage>`_
 - `PercentageLabelBar <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#PercentageLabelBar>`_
 - `ReverseBar <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#ReverseBar>`_
 - `RotatingMarker <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#RotatingMarker>`_
 - `SimpleProgress <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#SimpleProgress>`_
 - `Timer <http://progressbar-2.readthedocs.io/en/latest/_modules/progressbar/widgets.html#Timer>`_

The progressbar module is very easy to use, yet very powerful. It will also
automatically enable features like auto-resizing when the system supports it.

******************************************************************************
Known issues
******************************************************************************

- The Jetbrains (PyCharm, etc) editors work out of the box, but for more advanced features such as the `MultiBar` support you will need to enable the "Enable terminal in output console" checkbox in the Run dialog.
- The IDLE editor doesn't support these types of progress bars at all: https://bugs.python.org/issue23220
- Jupyter notebooks buffer `sys.stdout` which can cause mixed output. This issue can be resolved easily using: `import sys; sys.stdout.flush()`. Linked issue: https://github.com/WoLpH/python-progressbar/issues/173

******************************************************************************
Links
******************************************************************************

* Documentation
    - https://progressbar-2.readthedocs.org/en/latest/
* Source
    - https://github.com/WoLpH/python-progressbar
* Bug reports
    - https://github.com/WoLpH/python-progressbar/issues
* Package homepage
    - https://pypi.python.org/pypi/progressbar2
* My blog
    - https://w.wol.ph/

******************************************************************************
Usage
******************************************************************************

There are many ways to use Python Progressbar, you can see a few basic examples
here but there are many more in the examples file.

Wrapping an iterable
==============================================================================
.. code:: python

    import time
    import progressbar

    for i in progressbar.progressbar(range(100)):
        time.sleep(0.02)

Progressbars with logging
==============================================================================

Progressbars with logging require `stderr` redirection _before_ the
`StreamHandler` is initialized. To make sure the `stderr` stream has been
redirected on time make sure to call `progressbar.streams.wrap_stderr()` before
you initialize the `logger`.

One option to force early initialization is by using the `WRAP_STDERR`
environment variable, on Linux/Unix systems this can be done through:

.. code:: sh

    # WRAP_STDERR=true python your_script.py

If you need to flush manually while wrapping, you can do so using:

.. code:: python

    import progressbar

    progressbar.streams.flush()

In most cases the following will work as well, as long as you initialize the
`StreamHandler` after the wrapping has taken place.

.. code:: python

    import time
    import logging
    import progressbar

    progressbar.streams.wrap_stderr()
    logging.basicConfig()

    for i in progressbar.progressbar(range(10)):
        logging.error('Got %d', i)
        time.sleep(0.2)

Multiple (threaded) progressbars
==============================================================================

.. code:: python

    import random
    import threading
    import time

    import progressbar

    BARS = 5
    N = 50


    def do_something(bar):
        for i in bar(range(N)):
            # Sleep up to 0.1 seconds
            time.sleep(random.random() * 0.1)

            # print messages at random intervals to show how extra output works
            if random.random() > 0.9:
                bar.print('random message for bar', bar, i)


    with progressbar.MultiBar() as multibar:
        for i in range(BARS):
            # Get a progressbar
            bar = multibar[f'Thread label here {i}']
            # Create a thread and pass the progressbar
            threading.Thread(target=do_something, args=(bar,)).start()

Context wrapper
==============================================================================
.. code:: python

   import time
   import progressbar

   with progressbar.ProgressBar(max_value=10) as bar:
       for i in range(10):
           time.sleep(0.1)
           bar.update(i)

Combining progressbars with print output
==============================================================================
.. code:: python

    import time
    import progressbar

    for i in progressbar.progressbar(range(100), redirect_stdout=True):
        print('Some text', i)
        time.sleep(0.1)

Progressbar with unknown length
==============================================================================
.. code:: python

    import time
    import progressbar

    bar = progressbar.ProgressBar(max_value=progressbar.UnknownLength)
    for i in range(20):
        time.sleep(0.1)
        bar.update(i)

Bar with custom widgets
==============================================================================
.. code:: python

    import time
    import progressbar

    widgets=[
        ' [', progressbar.Timer(), '] ',
        progressbar.Bar(),
        ' (', progressbar.ETA(), ') ',
    ]
    for i in progressbar.progressbar(range(20), widgets=widgets):
        time.sleep(0.1)

Bar with wide Chinese (or other multibyte) characters
==============================================================================

.. code:: python

    # vim: fileencoding=utf-8
    import time
    import progressbar


    def custom_len(value):
        # These characters take up more space
        characters = {
            '进': 2,
            '度': 2,
        }

        total = 0
        for c in value:
            total += characters.get(c, 1)

        return total


    bar = progressbar.ProgressBar(
        widgets=[
            '进度: ',
            progressbar.Bar(),
            ' ',
            progressbar.Counter(format='%(value)02d/%(max_value)d'),
        ],
        len_func=custom_len,
    )
    for i in bar(range(10)):
        time.sleep(0.1)

Showing multiple independent progress bars in parallel
==============================================================================

.. code:: python

    import random
    import sys
    import time

    import progressbar

    BARS = 5
    N = 100

    # Construct the list of progress bars with the `line_offset` so they draw
    # below each other
    bars = []
    for i in range(BARS):
        bars.append(
            progressbar.ProgressBar(
                max_value=N,
                # We add 1 to the line offset to account for the `print_fd`
                line_offset=i + 1,
                max_error=False,
            )
        )

    # Create a file descriptor for regular printing as well
    print_fd = progressbar.LineOffsetStreamWrapper(lines=0, stream=sys.stdout)

    # The progress bar updates, normally you would do something useful here
    for i in range(N * BARS):
        time.sleep(0.005)

        # Increment one of the progress bars at random
        bars[random.randrange(0, BARS)].increment()

        # Print a status message to the `print_fd` below the progress bars
        print(f'Hi, we are at update {i+1} of {N * BARS}', file=print_fd)

    # Cleanup the bars
    for bar in bars:
        bar.finish()

    # Add a newline to make sure the next print starts on a new line
    print()

******************************************************************************

Naturally we can do this from separate threads as well:

.. code:: python

    import random
    import threading
    import time

    import progressbar

    BARS = 5
    N = 100

    # Create the bars with the given line offset
    bars = []
    for line_offset in range(BARS):
        bars.append(progressbar.ProgressBar(line_offset=line_offset, max_value=N))


    class Worker(threading.Thread):
        def __init__(self, bar):
            super().__init__()
            self.bar = bar

        def run(self):
            for i in range(N):
                time.sleep(random.random() / 25)
                self.bar.update(i)


    for bar in bars:
        Worker(bar).start()

    print()
