/usr/lib/python2.7/dist-packages/IPython/core/displaypub.py is in python-ipython 5.5.0-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | """An interface for publishing rich data to frontends.
There are two components of the display system:
* Display formatters, which take a Python object and compute the
representation of the object in various formats (text, HTML, SVG, etc.).
* The display publisher that is used to send the representation data to the
various frontends.
This module defines the logic display publishing. The display publisher uses
the ``display_data`` message type that is defined in the IPython messaging
spec.
"""
# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
from __future__ import print_function
import sys
from traitlets.config.configurable import Configurable
from traitlets import List
# This used to be defined here - it is imported for backwards compatibility
from .display import publish_display_data
#-----------------------------------------------------------------------------
# Main payload class
#-----------------------------------------------------------------------------
class DisplayPublisher(Configurable):
"""A traited class that publishes display data to frontends.
Instances of this class are created by the main IPython object and should
be accessed there.
"""
def _validate_data(self, data, metadata=None):
"""Validate the display data.
Parameters
----------
data : dict
The formata data dictionary.
metadata : dict
Any metadata for the data.
"""
if not isinstance(data, dict):
raise TypeError('data must be a dict, got: %r' % data)
if metadata is not None:
if not isinstance(metadata, dict):
raise TypeError('metadata must be a dict, got: %r' % data)
# use * to indicate transient, update are keyword-only
def publish(self, data, metadata=None, source=None, **kwargs):
"""Publish data and metadata to all frontends.
See the ``display_data`` message in the messaging documentation for
more details about this message type.
The following MIME types are currently implemented:
* text/plain
* text/html
* text/markdown
* text/latex
* application/json
* application/javascript
* image/png
* image/jpeg
* image/svg+xml
Parameters
----------
data : dict
A dictionary having keys that are valid MIME types (like
'text/plain' or 'image/svg+xml') and values that are the data for
that MIME type. The data itself must be a JSON'able data
structure. Minimally all data should have the 'text/plain' data,
which can be displayed by all frontends. If more than the plain
text is given, it is up to the frontend to decide which
representation to use.
metadata : dict
A dictionary for metadata related to the data. This can contain
arbitrary key, value pairs that frontends can use to interpret
the data. Metadata specific to each mime-type can be specified
in the metadata dict with the same mime-type keys as
the data itself.
source : str, deprecated
Unused.
transient: dict, keyword-only
A dictionary for transient data.
Data in this dictionary should not be persisted as part of saving this output.
Examples include 'display_id'.
update: bool, keyword-only, default: False
If True, only update existing outputs with the same display_id,
rather than creating a new output.
"""
# These are kwargs only on Python 3, not used there.
# For consistency and avoid code divergence we leave them here to
# simplify potential backport
transient = kwargs.pop('transient', None)
update = kwargs.pop('update', False)
# The default is to simply write the plain text data using sys.stdout.
if 'text/plain' in data:
print(data['text/plain'])
def clear_output(self, wait=False):
"""Clear the output of the cell receiving output."""
print('\033[2K\r', end='')
sys.stdout.flush()
print('\033[2K\r', end='')
sys.stderr.flush()
class CapturingDisplayPublisher(DisplayPublisher):
"""A DisplayPublisher that stores"""
outputs = List()
def publish(self, data, metadata=None, source=None):
self.outputs.append((data, metadata))
def clear_output(self, wait=False):
super(CapturingDisplayPublisher, self).clear_output(wait)
# empty the list, *do not* reassign a new list
del self.outputs[:]
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