napari.utils.cancelable_progress¶

class napari.utils.cancelable_progress(*_, **__)[source]¶

Bases: napari.utils.progress.progress

This class inherits from progress, providing the additional ability to cancel expensive executions. When progress is canceled by the user in the napari UI, two things will happen:

Firstly, the is_canceled attribute will become True, and the for loop will terminate after the current iteration, regardless of whether or not the iterator had more items.

Secondly, cancel_callback will be called, allowing the computation to close resources, repair state, etc.

See napari.utils.progress and tqdm.tqdm API for valid args and kwargs: https://tqdm.github.io/docs/tqdm/

Examples

>>> def long_running(steps=10, delay=0.1):
...     def on_cancel():
...         print("Canceled operation")
...     for i in cancelable_progress(range(steps), cancel_callback=on_cancel):
...         sleep(delay)

Methods

`cancel`()	Cancels the execution of the underlying computation.
`clear`([nolock])	Clear current bar display.
`close`()	Close progress object and emit event.
`display`([msg, pos])	Update the display and emit eta event.
`external_write_mode`([file, nolock])	Disable tqdm within context and refresh tqdm when exits.
`format_interval`(t)	Formats a number of seconds as a clock time, [H:]MM:SS
`format_meter`(n, total, elapsed[, ncols, ...])	Return a string-based progress bar given some parameters
`format_num`(n)	Intelligent scientific notation (.3g).
`format_sizeof`(num[, suffix, divisor])	Formats a number (greater than unity) with SI Order of Magnitude prefixes.
`get_lock`()	Get the global lock.
`increment_with_overflow`()	Update if not exceeding total, else set indeterminate range.
`moveto`(n)
`pandas`(**tqdm_kwargs)	Registers the current tqdm class with
`refresh`([nolock, lock_args])	Force refresh the display of this bar.
`reset`([total])	Resets to 0 iterations for repeated use.
`set_description`(desc)	Update progress description and emit description event.
`set_description_str`([desc, refresh])	Set/modify description without ': ' appended.
`set_lock`(lock)	Set the global lock.
`set_postfix`([ordered_dict, refresh])	Set/modify postfix (additional stats) with automatic formatting based on datatype.
`set_postfix_str`([s, refresh])	Postfix without dictionary expansion, similar to prefix handling.
`status_printer`(file)	Manage the printing and in-place updating of a line of characters.
`unpause`()	Restart tqdm timer from last print time.
`update`([n])	Update progress value by n and emit value event
`wrapattr`(stream, method[, total, bytes])	stream : file-like object. method : str, "read" or "write". The result of read() and the first argument of write() should have a len().
`write`(s[, file, end, nolock])	Print a message via tqdm (without overlap with bars).

Attributes

`format_dict`	Public API for read-only member access.
`monitor`
`monitor_interval`
`total`

Details

cancel()[source]¶: Cancels the execution of the underlying computation. Note that the current iteration will be allowed to complete, however future iterations will not be run.

clear(nolock=False)¶: Clear current bar display.

close()¶: Close progress object and emit event.

display(msg: Optional[str] = None, pos: Optional[int] = None) → None¶: Update the display and emit eta event.

classmethod external_write_mode(file=None, nolock=False)¶: Disable tqdm within context and refresh tqdm when exits. Useful when writing to standard output stream

property format_dict¶: Public API for read-only member access.

static format_interval(t)¶

Formats a number of seconds as a clock time, [H:]MM:SS

Parameters: t (int) – Number of seconds.
Returns: out – [H:]MM:SS
Return type: str

static format_meter(n, total, elapsed, ncols=None, prefix='', ascii=False, unit='it', unit_scale=False, rate=None, bar_format=None, postfix=None, unit_divisor=1000, initial=0, colour=None, **extra_kwargs)¶

Return a string-based progress bar given some parameters

Parameters

n (int or float) – Number of finished iterations.
total (int or float) – The expected total number of iterations. If meaningless (None), only basic progress statistics are displayed (no ETA).
elapsed (float) – Number of seconds passed since start.
ncols (int, optional) – The width of the entire output message. If specified, dynamically resizes {bar} to stay within this bound [default: None]. If 0, will not print any bar (only stats). The fallback is {bar:10}.
prefix (str, optional) – Prefix message (included in total width) [default: ‘’]. Use as {desc} in bar_format string.
ascii (bool, optional or str, optional) – If not set, use unicode (smooth blocks) to fill the meter [default: False]. The fallback is to use ASCII characters ” 123456789#”.
unit (str, optional) – The iteration unit [default: ‘it’].
unit_scale (bool or int or float, optional) – If 1 or True, the number of iterations will be printed with an appropriate SI metric prefix (k = 10^3, M = 10^6, etc.) [default: False]. If any other non-zero number, will scale total and n.
rate (float, optional) – Manual override for iteration rate. If [default: None], uses n/elapsed.
bar_format (str, optional) –
Specify a custom bar string formatting. May impact performance. [default: ‘{l_bar}{bar}{r_bar}’], where l_bar=’{desc}: {percentage:3.0f}%|’ and r_bar=’| {n_fmt}/{total_fmt} [{elapsed}<{remaining}, ‘

’{rate_fmt}{postfix}]’

Possible vars: l_bar, bar, r_bar, n, n_fmt, total, total_fmt,
percentage, elapsed, elapsed_s, ncols, nrows, desc, unit, rate, rate_fmt, rate_noinv, rate_noinv_fmt, rate_inv, rate_inv_fmt, postfix, unit_divisor, remaining, remaining_s, eta.

Note that a trailing “: ” is automatically removed after {desc} if the latter is empty.
postfix (*, optional) – Similar to prefix, but placed at the end (e.g. for additional stats). Note: postfix is usually a string (not a dict) for this method, and will if possible be set to postfix = ‘, ‘ + postfix. However other types are supported (#382).
unit_divisor (float, optional) – [default: 1000], ignored unless unit_scale is True.
initial (int or float, optional) – The initial counter value [default: 0].
colour (str, optional) – Bar colour (e.g. ‘green’, ‘#00ff00’).

Returns

out

Return type

Formatted meter and stats, ready to display.

static format_num(n)¶

Intelligent scientific notation (.3g).

Parameters: n (int or float or Numeric) – A Number.
Returns: out – Formatted number.
Return type: str

static format_sizeof(num, suffix='', divisor=1000)¶

Formats a number (greater than unity) with SI Order of Magnitude prefixes.

Parameters

num (float) – Number ( >= 1) to format.
suffix (str, optional) – Post-postfix [default: ‘’].
divisor (float, optional) – Divisor between prefixes [default: 1000].

Returns

out – Number with Order of Magnitude SI unit postfix.

Return type

str

classmethod get_lock()¶: Get the global lock. Construct it if it does not exist.

increment_with_overflow()¶: Update if not exceeding total, else set indeterminate range.

classmethod pandas(**tqdm_kwargs)¶

Registers the current tqdm class with: pandas.core. ( frame.DataFrame | series.Series | groupby.(generic.)DataFrameGroupBy | groupby.(generic.)SeriesGroupBy ).progress_apply

A new instance will be created every time progress_apply is called, and each instance will automatically close() upon completion.

Parameters: tqdm_kwargs (arguments for the tqdm instance) –

Examples

>>> import pandas as pd
>>> import numpy as np
>>> from tqdm import tqdm
>>> from tqdm.gui import tqdm as tqdm_gui
>>>
>>> df = pd.DataFrame(np.random.randint(0, 100, (100000, 6)))
>>> tqdm.pandas(ncols=50)  # can use tqdm_gui, optional kwargs, etc
>>> # Now you can use `progress_apply` instead of `apply`
>>> df.groupby(0).progress_apply(lambda x: x**2)

References

<https://stackoverflow.com/questions/18603270/ progress-indicator-during-pandas-operations-python>

refresh(nolock=False, lock_args=None)¶

Force refresh the display of this bar.

Parameters

nolock (bool, optional) – If True, does not lock. If [default: False]: calls acquire() on internal lock.
lock_args (tuple, optional) – Passed to internal lock’s acquire(). If specified, will only display() if acquire() returns True.

reset(total=None)¶

Resets to 0 iterations for repeated use.

Consider combining with leave=True.

Parameters: total (int or float, optional. Total to use for the new bar.) –

set_description(desc)¶: Update progress description and emit description event.

set_description_str(desc=None, refresh=True)¶: Set/modify description without ‘: ‘ appended.

classmethod set_lock(lock)¶: Set the global lock.

set_postfix(ordered_dict=None, refresh=True, **kwargs)¶

Set/modify postfix (additional stats) with automatic formatting based on datatype.

Parameters

ordered_dict (dict or OrderedDict, optional) –
refresh (bool, optional) – Forces refresh [default: True].
kwargs (dict, optional) –

set_postfix_str(s='', refresh=True)¶: Postfix without dictionary expansion, similar to prefix handling.

static status_printer(file)¶: Manage the printing and in-place updating of a line of characters. Note that if the string is longer than a line, then in-place updating may not work (it will print a new line at each refresh).

unpause()¶: Restart tqdm timer from last print time.

update(n=1)¶: Update progress value by n and emit value event

classmethod wrapattr(stream, method, total=None, bytes=True, **tqdm_kwargs)¶

stream : file-like object. method : str, “read” or “write”. The result of read() and

the first argument of write() should have a len().

>>> with tqdm.wrapattr(file_obj, "read", total=file_obj.size) as fobj:
...     while True:
...         chunk = fobj.read(chunk_size)
...         if not chunk:
...             break

classmethod write(s, file=None, end='\n', nolock=False)¶: Print a message via tqdm (without overlap with bars).

napari.utils.nbscreenshot

napari.utils.progress