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328 lines
11 KiB
328 lines
11 KiB
"""
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IPython/Jupyter Notebook progressbar decorator for iterators.
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Includes a default `range` iterator printing to `stderr`.
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Usage:
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>>> from tqdm.notebook import trange, tqdm
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>>> for i in trange(10):
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... ...
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"""
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# future division is important to divide integers and get as
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# a result precise floating numbers (instead of truncated int)
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from __future__ import absolute_import, division
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# import compatibility functions and utilities
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import re
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import sys
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from weakref import proxy
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# to inherit from the tqdm class
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from .std import tqdm as std_tqdm
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from .utils import _range
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if True: # pragma: no cover
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# import IPython/Jupyter base widget and display utilities
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IPY = 0
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try: # IPython 4.x
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import ipywidgets
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IPY = 4
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except ImportError: # IPython 3.x / 2.x
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IPY = 32
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import warnings
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with warnings.catch_warnings():
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warnings.filterwarnings(
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'ignore', message=".*The `IPython.html` package has been deprecated.*")
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try:
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import IPython.html.widgets as ipywidgets # NOQA: F401
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except ImportError:
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pass
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try: # IPython 4.x / 3.x
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if IPY == 32:
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from IPython.html.widgets import HTML
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from IPython.html.widgets import FloatProgress as IProgress
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from IPython.html.widgets import HBox
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IPY = 3
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else:
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from ipywidgets import HTML
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from ipywidgets import FloatProgress as IProgress
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from ipywidgets import HBox
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except ImportError:
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try: # IPython 2.x
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from IPython.html.widgets import HTML
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from IPython.html.widgets import ContainerWidget as HBox
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from IPython.html.widgets import FloatProgressWidget as IProgress
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IPY = 2
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except ImportError:
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IPY = 0
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IProgress = None
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HBox = object
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try:
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from IPython.display import display # , clear_output
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except ImportError:
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pass
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# HTML encoding
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try: # Py3
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from html import escape
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except ImportError: # Py2
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from cgi import escape
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__author__ = {"github.com/": ["lrq3000", "casperdcl", "alexanderkuk"]}
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__all__ = ['tqdm_notebook', 'tnrange', 'tqdm', 'trange']
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class TqdmHBox(HBox):
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"""`ipywidgets.HBox` with a pretty representation"""
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def _repr_json_(self, pretty=None):
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pbar = getattr(self, 'pbar', None)
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if pbar is None:
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return {}
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d = pbar.format_dict
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if pretty is not None:
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d["ascii"] = not pretty
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return d
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def __repr__(self, pretty=False):
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pbar = getattr(self, 'pbar', None)
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if pbar is None:
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return super(TqdmHBox, self).__repr__()
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return pbar.format_meter(**self._repr_json_(pretty))
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def _repr_pretty_(self, pp, *_, **__):
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pp.text(self.__repr__(True))
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class tqdm_notebook(std_tqdm):
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"""
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Experimental IPython/Jupyter Notebook widget using tqdm!
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"""
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@staticmethod
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def status_printer(_, total=None, desc=None, ncols=None):
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"""
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Manage the printing of an IPython/Jupyter Notebook progress bar widget.
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"""
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# Fallback to text bar if there's no total
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# DEPRECATED: replaced with an 'info' style bar
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# if not total:
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# return super(tqdm_notebook, tqdm_notebook).status_printer(file)
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# fp = file
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# Prepare IPython progress bar
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if IProgress is None: # #187 #451 #558 #872
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raise ImportError(
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"IProgress not found. Please update jupyter and ipywidgets."
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" See https://ipywidgets.readthedocs.io/en/stable"
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"/user_install.html")
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if total:
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pbar = IProgress(min=0, max=total)
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else: # No total? Show info style bar with no progress tqdm status
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pbar = IProgress(min=0, max=1)
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pbar.value = 1
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pbar.bar_style = 'info'
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if ncols is None:
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pbar.layout.width = "20px"
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ltext = HTML()
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rtext = HTML()
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if desc:
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ltext.value = desc
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container = TqdmHBox(children=[ltext, pbar, rtext])
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# Prepare layout
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if ncols is not None: # use default style of ipywidgets
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# ncols could be 100, "100px", "100%"
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ncols = str(ncols) # ipywidgets only accepts string
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try:
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if int(ncols) > 0: # isnumeric and positive
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ncols += 'px'
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except ValueError:
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pass
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pbar.layout.flex = '2'
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container.layout.width = ncols
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container.layout.display = 'inline-flex'
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container.layout.flex_flow = 'row wrap'
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return container
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def display(self, msg=None, pos=None,
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# additional signals
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close=False, bar_style=None, check_delay=True):
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# Note: contrary to native tqdm, msg='' does NOT clear bar
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# goal is to keep all infos if error happens so user knows
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# at which iteration the loop failed.
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# Clear previous output (really necessary?)
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# clear_output(wait=1)
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if not msg and not close:
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d = self.format_dict
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# remove {bar}
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d['bar_format'] = (d['bar_format'] or "{l_bar}<bar/>{r_bar}").replace(
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"{bar}", "<bar/>")
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msg = self.format_meter(**d)
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ltext, pbar, rtext = self.container.children
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pbar.value = self.n
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if msg:
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# html escape special characters (like '&')
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if '<bar/>' in msg:
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left, right = map(escape, re.split(r'\|?<bar/>\|?', msg, 1))
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else:
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left, right = '', escape(msg)
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# Update description
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ltext.value = left
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# never clear the bar (signal: msg='')
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if right:
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rtext.value = right
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# Change bar style
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if bar_style:
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# Hack-ish way to avoid the danger bar_style being overridden by
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# success because the bar gets closed after the error...
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if pbar.bar_style != 'danger' or bar_style != 'success':
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pbar.bar_style = bar_style
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# Special signal to close the bar
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if close and pbar.bar_style != 'danger': # hide only if no error
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try:
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self.container.close()
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except AttributeError:
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self.container.visible = False
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if check_delay and self.delay > 0 and not self.displayed:
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display(self.container)
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self.displayed = True
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@property
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def colour(self):
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if hasattr(self, 'container'):
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return self.container.children[-2].style.bar_color
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@colour.setter
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def colour(self, bar_color):
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if hasattr(self, 'container'):
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self.container.children[-2].style.bar_color = bar_color
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def __init__(self, *args, **kwargs):
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"""
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Supports the usual `tqdm.tqdm` parameters as well as those listed below.
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Parameters
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----------
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display : Whether to call `display(self.container)` immediately
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[default: True].
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"""
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kwargs = kwargs.copy()
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# Setup default output
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file_kwarg = kwargs.get('file', sys.stderr)
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if file_kwarg is sys.stderr or file_kwarg is None:
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kwargs['file'] = sys.stdout # avoid the red block in IPython
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# Initialize parent class + avoid printing by using gui=True
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kwargs['gui'] = True
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# convert disable = None to False
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kwargs['disable'] = bool(kwargs.get('disable', False))
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colour = kwargs.pop('colour', None)
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display_here = kwargs.pop('display', True)
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super(tqdm_notebook, self).__init__(*args, **kwargs)
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if self.disable or not kwargs['gui']:
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self.disp = lambda *_, **__: None
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return
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# Get bar width
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self.ncols = '100%' if self.dynamic_ncols else kwargs.get("ncols", None)
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# Replace with IPython progress bar display (with correct total)
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unit_scale = 1 if self.unit_scale is True else self.unit_scale or 1
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total = self.total * unit_scale if self.total else self.total
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self.container = self.status_printer(self.fp, total, self.desc, self.ncols)
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self.container.pbar = proxy(self)
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self.displayed = False
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if display_here and self.delay <= 0:
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display(self.container)
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self.displayed = True
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self.disp = self.display
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self.colour = colour
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# Print initial bar state
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if not self.disable:
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self.display(check_delay=False)
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def __iter__(self):
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try:
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for obj in super(tqdm_notebook, self).__iter__():
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# return super(tqdm...) will not catch exception
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yield obj
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# NB: except ... [ as ...] breaks IPython async KeyboardInterrupt
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except: # NOQA
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self.disp(bar_style='danger')
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raise
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# NB: don't `finally: close()`
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# since this could be a shared bar which the user will `reset()`
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def update(self, n=1):
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try:
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return super(tqdm_notebook, self).update(n=n)
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# NB: except ... [ as ...] breaks IPython async KeyboardInterrupt
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except: # NOQA
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# cannot catch KeyboardInterrupt when using manual tqdm
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# as the interrupt will most likely happen on another statement
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self.disp(bar_style='danger')
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raise
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# NB: don't `finally: close()`
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# since this could be a shared bar which the user will `reset()`
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def close(self):
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if self.disable:
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return
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super(tqdm_notebook, self).close()
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# Try to detect if there was an error or KeyboardInterrupt
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# in manual mode: if n < total, things probably got wrong
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if self.total and self.n < self.total:
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self.disp(bar_style='danger', check_delay=False)
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else:
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if self.leave:
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self.disp(bar_style='success', check_delay=False)
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else:
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self.disp(close=True, check_delay=False)
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def clear(self, *_, **__):
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pass
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def reset(self, total=None):
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"""
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Resets to 0 iterations for repeated use.
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Consider combining with `leave=True`.
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Parameters
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----------
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total : int or float, optional. Total to use for the new bar.
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"""
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if self.disable:
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return super(tqdm_notebook, self).reset(total=total)
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_, pbar, _ = self.container.children
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pbar.bar_style = ''
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if total is not None:
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pbar.max = total
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if not self.total and self.ncols is None: # no longer unknown total
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pbar.layout.width = None # reset width
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return super(tqdm_notebook, self).reset(total=total)
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def tnrange(*args, **kwargs):
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"""
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A shortcut for `tqdm.notebook.tqdm(xrange(*args), **kwargs)`.
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On Python3+, `range` is used instead of `xrange`.
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"""
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return tqdm_notebook(_range(*args), **kwargs)
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# Aliases
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tqdm = tqdm_notebook
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trange = tnrange
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