cs.progress 20210803

A progress tracker with methods for throughput, ETA and update notification; also a compound progress meter composed from other progress meters.

A progress tracker with methods for throughput, ETA and update notification; also a compound progress meter composed from other progress meters.

Latest release 20210803:

• progressbar,iterbar: accept optional RunState to cancel iteration.
• BaseProgress.iterbar: make update_min_size properly optional, was making update_frequency ineffective.

Function auto_progressbar(*da, **dkw)

Decorator for a function accepting an optional progress keyword parameter. If progress is None and the default Upd is not disabled, run the function with a progress bar.

Class BaseProgress

The base class for Progress and OverProcess with various common methods.

Note that durations are in seconds and that absolute time is in seconds since the UNIX epoch (the basis of time.time()).

Method BaseProgress.__init__(self, name=None, start_time=None, units_scale=None)

Initialise a progress instance.

Parameters:

• name: optional name
• start_time: optional UNIX epoch start time, default from time.time()
• units_scale: a scale for use with cs.units.transcribe, default BINARY_BYTES_SCALE

Method BaseProgress.__eq__(self, other)

A Progress is equal to another object other if its position equals int(other).

Method BaseProgress.__ge__(self, other, NotImplemented=NotImplemented)

Return a >= b. Computed by @total_ordering from (not a < b).

Method BaseProgress.__gt__(self, other, NotImplemented=NotImplemented)

Return a > b. Computed by @total_ordering from (not a < b) and (a != b).

Method BaseProgress.__int__(self)

int(Progress) returns the current position.

Method BaseProgress.__le__(self, other, NotImplemented=NotImplemented)

Return a <= b. Computed by @total_ordering from (a < b) or (a == b).

Method BaseProgress.__lt__(self, other)

A Progress is less then another object other if its position is less than int(other).

Method BaseProgress.arrow(self, width, no_padding=False)

Construct a progress arrow representing completion to fit in the specified width.

Method BaseProgress.bar(self, label=None, upd=None, proxy=None, statusfunc=None, width=None, window=None, report_print=None, insert_pos=1, deferred=False)

A context manager to create and withdraw a progress bar. It returns the UpdProxy which displays the progress bar.

Parameters:

• label: a label for the progress bar, default from self.name.
• proxy: an optional UpdProxy to display the progress bar
• upd: an optional cs.upd.Upd instance, used to produce the progress bar status line if not supplied. The default upd is cs.upd.Upd() which uses sys.stderr for display.
• statusfunc: an optional function to compute the progress bar text accepting (self,label,width).
• width: an optional width expressioning how wide the progress bar text may be. The default comes from the proxy.width property.
• window: optional timeframe to define "recent" in seconds; if the default statusfunc (Progress.status) is used this is passed to it
• report_print: optional print compatible function with which to write a report on completion; this may also be a bool, which if true will use Upd.print in order to interoperate with Upd.
• insert_pos: where to insert the progress bar, default 1
• deferred: optional flag; if true do not create the progress bar until the first update occurs.

Example use:

# display progress reporting during upload_filename()
# which updates the supplied Progress instance
# during its operation
P = Progress(name=label)
with P.bar(report_print=True):
    upload_filename(src, progress=P)

Property BaseProgress.elapsed_time

Time elapsed since start_time.

Property BaseProgress.eta

The projected time of completion: now + remaining_time.

If remaining_time is None, this is also None.

Method BaseProgress.format_counter(self, value, scale=None, max_parts=2, sep=',')

Format value accoridng to scale and max_parts using cs.units.transcribe.

Method BaseProgress.iterbar(self, it, label=None, upd=None, proxy=None, itemlenfunc=None, statusfunc=None, incfirst=False, width=None, window=None, update_frequency=1, update_min_size=None, report_print=None, runstate=None)

An iterable progress bar: a generator yielding values from the iterable it while updating a progress bar.

Parameters:

• it: the iterable to consume and yield.
• itemlenfunc: an optional function returning the "size" of each item from it, used to advance self.position. The default is to assume a size of 1. A convenient alternative choice may be the builtin function len.
• incfirst: whether to advance self.position before we yield an item from it or afterwards. This reflects whether it is considered that progress is made as items are obtained or only after items are processed by whatever is consuming this generator. The default is False, advancing after processing.
• label: a label for the progress bar, default from self.name.
• width: an optional width expressing how wide the progress bar text may be. The default comes from the proxy.width property.
• window: optional timeframe to define "recent" in seconds; if the default statusfunc (Progress.status) is used this is passed to it
• statusfunc: an optional function to compute the progress bar text accepting (self,label,width).
• proxy: an optional proxy for displaying the progress bar, a callable accepting the result of statusfunc. The default is a cs.upd.UpdProxy created from upd, which inserts a progress bar above the main status line.
• upd: an optional cs.upd.Upd instance, used only to produce the default proxy if that is not supplied. The default upd is cs.upd.Upd() which uses sys.stderr for display.
• update_frequency: optional update frequency, default 1; only update the progress bar after this many iterations, useful if the iteration rate is quite high
• update_min_size: optional update step size; only update the progress bar after an advance of this many units, useful if the iteration size increment is quite small
• report_print: optional print compatible function with which to write a report on completion; this may also be a bool, which if true will use Upd.print in order to interoperate with Upd.
• runstate: optional RunState whose .cancelled property can be consulted

Example use:

from cs.units import DECIMAL_SCALE
rows = [some list of data]
P = Progress(total=len(rows), units_scale=DECIMAL_SCALE)
for row in P.iterbar(rows, incfirst=True):
    ... do something with each row ...

f = open(data_filename, 'rb')
datalen = os.stat(f).st_size
def readfrom(f):
    while True:
        bs = f.read(65536)
        if not bs:
            break
        yield bs
P = Progress(total=datalen)
for bs in P.iterbar(readfrom(f), itemlenfunc=len):
    ... process the file data in bs ...

Property BaseProgress.ratio

The fraction of progress completed: (position-start)/(total-start). Returns None if total is None or total<=start.

Example:

>>> P = Progress()
 P.ratio
>>> P.total = 16
>>> P.ratio
0.0
>>> P.update(4)
>>> P.ratio
0.25

Property BaseProgress.remaining_time

The projected time remaining to end based on the throughput and total.

If total is None, this is None.

Method BaseProgress.status(self, label, width, window=None)

A progress string of the form: label: pos/total` ==> ETA 'time

Parameters:

• label: the label for the status line; if None use self.name
• width: the available width for the status line; if not an int use width.width
• window: optional timeframe to define "recent" in seconds, default : 5

Method BaseProgress.text_pos_of_total(self, fmt=None, fmt_pos=None, fmt_total=None, pos_first=False)

Return a "total:position" or "position/total" style progress string.

Parameters:

• fmt: format string interpolating pos_text and total_text. Default: "{pos_text}/{total_text}" if pos_first, otherwise "{total_text}:{pos_text}"
• fmt_pos: formatting function for self.position, default self.format_counter
• fmt_total: formatting function for self.total, default from fmt_pos
• pos_first: put the position first if true (default False), only consulted if fmt is None

Property BaseProgress.throughput

The overall throughput: self.throughput_overall().

By comparison, the Progress.throughput property is self.throughput_recent if the throughput_window is not None, otherwise it falls back to throughput_overall.

Method BaseProgress.throughput_overall(self)

The overall throughput from start to position during elapsed_time.

Method BaseProgress.throughput_recent(self, time_window)

The recent throughput. Implemented by subclasses.

Class CheckPoint(builtins.tuple)

CheckPoint(time, position)

Property CheckPoint.position

Alias for field number 1

Property CheckPoint.time

Alias for field number 0

Class OverProgress(BaseProgress)

A Progress-like class computed from a set of subsidiary Progresses.

AN OverProgress instance has an attribute notify_update which is a set of callables. Whenever the position of a subsidiary Progress is updated, each of these will be called with the Progress instance and None.

Example:

>>> P = OverProgress(name="over")
>>> P1 = Progress(name="progress1", position=12)
>>> P1.total = 100
>>> P1.advance(7)
>>> P2 = Progress(name="progress2", position=20)
>>> P2.total = 50
>>> P2.advance(9)
>>> P.add(P1)
>>> P.add(P2)
>>> P1.total
100
>>> P2.total
50
>>> P.total
150
>>> P1.start
12
>>> P2.start
20
>>> P.start
0
>>> P1.position
19
>>> P2.position
29
>>> P.position
16

Method OverProgress.add(self, subprogress)

Add a subsidairy Progress to the contributing set.

Property OverProgress.eta

The eta is the maximum of the subsidiary etas.

Property OverProgress.position

The position is the sum off the subsidiary position offsets from their respective starts.

Method OverProgress.remove(self, subprogress, accrue=False)

Remove a subsidairy Progress from the contributing set.

Property OverProgress.start

We always return a starting value of 0.

Property OverProgress.throughput

The throughput is the sum of the subsidiary throughputs.

Method OverProgress.throughput_recent(self, time_window)

The throughput_recent is the sum of the subsidiary throughput_recentss.

Property OverProgress.total

The total is the sum of the subsidiary totals.

Class Progress(BaseProgress)

A progress counter to track task completion with various utility methods.

Example:

>>> P = Progress(name="example")
>>> P                         #doctest: +ELLIPSIS
Progress(name='example',start=0,position=0,start_time=...,throughput_window=None,total=None):[CheckPoint(time=..., position=0)]
>>> P.advance(5)
>>> P                         #doctest: +ELLIPSIS
Progress(name='example',start=0,position=5,start_time=...,throughput_window=None,total=None):[CheckPoint(time=..., position=0), CheckPoint(time=..., position=5)]
>>> P.total = 100
>>> P                         #doctest: +ELLIPSIS
Progress(name='example',start=0,position=5,start_time=...,throughput_window=None,total=100):[CheckPoint(time=..., position=0), CheckPoint(time=..., position=5)]

A Progress instance has an attribute notify_update which is a set of callables. Whenever the position is updated, each of these will be called with the Progress instance and the latest CheckPoint.

Progress objects also make a small pretense of being an integer. The expression int(progress) returns the current position, and += and -= adjust the position.

This is convenient for coding, but importantly it is also useful for discretionary use of a Progress with some other object. If you want to make a lightweight Progress capable class you can set a position attribute to an int and manipulate it carefully using += and -= entirely. If you decide to incur the cost of maintaining a Progress object you can slot it in:

# initial setup with just an int
my_thing.amount = 0

# later, or on some option, use a Progress instance
my_thing.amount = Progress(my_thing.amount)

Method Progress.__init__(self, position=None, name=None, start=None, start_time=None, throughput_window=None, total=None, units_scale=None)

Initialise the Progesss object.

Parameters:

• position: initial position, default 0.
• name: optional name for this instance.
• start: starting position of progress range, default from position.
• start_time: start time of the process, default now.
• throughput_window: length of throughput time window in seconds, default None.
• total: expected completion value, default None.

Method Progress.__iadd__(self, delta)

Operator += form of advance().

P = Progress() P.position 0 P += 4 P.position 4 P += 4 P.position 8

Method Progress.__isub__(self, delta)

Operator -= form of advance().

P = Progress() P.position 0 P += 4 P.position 4 P -= 4 P.position 0

Method Progress.advance(self, delta, update_time=None)

Record more progress, return the advanced position.

P = Progress() P.position 0 P.advance(4) P.position 4 P.advance(4) P.position 8

Property Progress.latest

Latest datum.

Property Progress.position

Latest position.

Property Progress.throughput

Current throughput per second.

If self.throughput_window is not None, calls self.throughput_recent(throughput_window). Otherwise call self.throughput_overall().

Method Progress.throughput_recent(self, time_window)

Recent throughput per second within a time window in seconds.

The time span overlapping the start of the window is included on a flat pro rata basis.

Property Progress.total

Return the current total.

Method Progress.update(self, new_position, update_time=None)

Record more progress.

P = Progress() P.position 0 P.update(12) P.position 12

Function progressbar(it, label=None, position=None, total=None, units_scale=(UnitStep(factor=0, unit='', max_width=0),), **kw)

Convenience function to construct and run a Progress.iterbar wrapping the iterable it, issuing and withdrawning a progress bar during the iteration.

Parameters:

• it: the iterable to consume
• label: optional label, doubles as the Progress.name
• position: optional starting position
• total: optional value for Progress.total, default from len(it) if supported.
• units_scale: optional units scale for Progress, default UNSCALED_SCALE

If total is None and it supports len() then the Progress.total is set from it.

All arguments are passed through to Progress.iterbar.

Example use:

for row in progressbar(rows):
    ... do something with row ...

Function selftest(argv)

Exercise some of the functionality.

Release Log

Release 20210803:

• progressbar,iterbar: accept optional RunState to cancel iteration.
• BaseProgress.iterbar: make update_min_size properly optional, was making update_frequency ineffective.

Release 20210730: When there is no total just report position and no ETA.

Release 20210717: Minor tweaks.

Release 20210316:

• Progress.iterbar: only update the status line once per iteration, either before or after the yield according to incfirst.
• Progress.iterbar: fix the meaning of update_frequency to count iterations, add update_min_size to count progress advance.

Release 20210306: progressbar: accept new optional position parameter, used to initialise the Progress.

Release 20201102.1: DISTINFO: fix module dependencies.

Release 20201102:

• Format/layout changes for the default status line.
• Progress.throughtput_recent: return None if no new positions beyond the starting position.
• BaseProgress.status: accept label=None (default to self.name) and width=UpdProxy (uses width.width).
• BaseProgress.status: new optional window parameter, default 5, defining the recent throughput window size in seconds.
• A few bugfixes.

Release 20201025:

• Some formatting improvements.
• BaseProgress.bar: new insert_pos parameter to position the progress bar, default still 1.
• BaseProgress.bar: new deferred parameter putting off the status bar until the first update.
• BaseProgress.bar: accept new optional proxy parameter to use (and not delete) an existing UpdProxy for display.
• Progress.text_pos_of_total: new pos_first=False parameter, rendering the total before the position by default (less progress bar noise).
• New @auto_progressbar decorator to provide a progress bar and initialise progress= parameter to functions which can use a Progress for reporting.
• Assorted fixes.

Release 20200718.3: BaseProgress.bar, progressbar: new optional report_print parameter for reporting on completion.

Release 20200718.2: Bugfix: BaseProgress.status: handle throughput=0 when total=None.

Release 20200718.1: BaseProgress.bar, progressbar: new optional update_frequency parameter for less frequent updates.

Release 20200718:

• Readability improvement for default status line.
• progressbar: default units_scale=UNSCALED_SCALE.

Release 20200716.1: BaseProgress.status: round throughput to an int if >=10.

Release 20200716:

• BaseProgress.status: distinguish "idle" (position >= total) from "stalled" (position < total).
• BaseProgress.status: make the status very short if the progress is idle.

Release 20200627:

• BaseProgress.status: handle throughput=None (before any activity).
• BaseProgress: drop count_of_total_bytes_text, superceded by format_counter (which honours the units_scale).

Release 20200626:

• New Progress.bar generator method iterating over an iterable while displaying a progress bar.
• New convenience function progressbar(it,...) which rolls its own Progress instance.
• Progress: always support a throughput window, default to DEFAULT_THROUGHPUT_WINDOW = 5s.
• Improve the default progress bar render returned by Progress.status().

Release 20200613:

• BaseProgress, Progress and OverProgress now accept an optional units_scale, such as cs.units.UNSCALED_SCALE, to use when expressing progress - the default remains BINARY_SCALE.
• New arrow(), format_counter() and text_pos_of_total() methods to produce components of the status string for tuning or external reuse.

Release 20200520: OverProgress: throughput and eta implementations.

Release 20200129.3: Test version machinery again.

Release 20200129.2: set version to '20200129.2'

Release 20200129.1: Dummy release to test new version.

Release 20200129: New Progress.count_of_total_bytes_text property presenting "3kB/40MB" style text.

Release 20190812:

• New OverProgress class which is a composite of a set of subsidiary Progress instances.
• Assorted other small updates.

Release 20190220:

• Progress: be somewhat like an int.
• New status() method returning a convenient one line progress status report.

Release 20180703.2: Progress: make .total into a property in order to fire the update notifications.

Release 20180703.1: Progress: additions and changes to API: new .ratio, .elapsed_time, rename .projected to .remaining_time.

Release 20180703: Initial release of cs.progress.