Source code for bokeh.application.handlers.script

#-----------------------------------------------------------------------------
# Copyright (c) 2012 - 2019, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------
''' Provide a Bokeh Application Handler to build up documents by running
the code from Python script (``.py``) files.

This handler is configured with the filename of a Python module. When a
Bokeh application calls ``modify_doc``, the contents of the module are run to
process a new Document for a session. When the script code is executed, the
Document being modified will be available as ``curdoc``, and any optionally
provided ``args`` will be available as ``sys.argv``.

As an example, consider the following Python module ``myapp.py``

.. code-block:: python

    # myapp.py

    import sys

    from bokeh.io import cudoc
    from bokeh.plotting import figure

    p = figure(x_range=(10, 10), y_range=(10, 10), title=sys.argv[1])

    curdoc().add_root(p)

The a ``ScriptHandler`` configured with this script will modify new Bokeh
Documents by adding an empty plot with a title taken from ``args``.

'''

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# Boilerplate
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from __future__ import absolute_import, division, print_function, unicode_literals

import logging
log = logging.getLogger(__name__)

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# Imports
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# Standard library imports

# External imports
import six

# Bokeh imports
from .code import CodeHandler

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# Globals and constants
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__all__ = (
    'ScriptHandler',
)

#-----------------------------------------------------------------------------
# General API
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#-----------------------------------------------------------------------------
# Dev API
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[docs]class ScriptHandler(CodeHandler): ''' Modify Bokeh documents by executing code from Python scripts. ''' _logger_text = "%s: call to %s() ignored when running scripts with the 'bokeh' command." _origin = "Script"
[docs] def __init__(self, *args, **kwargs): ''' Keywords: filename (str) : a path to a Python source (".py") file ''' if 'filename' not in kwargs: raise ValueError('Must pass a filename to ScriptHandler') filename = kwargs['filename'] # For Python 3, encoding must be set to utf-8 because: # - when specifying an encoding in `io.open`, it doesn't # work with Python 2, # - default encoding used by Python 3 `open` statement # is not 'utf-8' on Windows platform, # - Python 3 `open` ignores le `coding` comment line. # See https://github.com/bokeh/bokeh/pull/8202 for details. if six.PY3: with open(filename, 'r', encoding='utf-8') as f: kwargs['source'] = f.read() else: with open(filename, 'r') as f: kwargs['source'] = f.read() super(ScriptHandler, self).__init__(*args, **kwargs)
#----------------------------------------------------------------------------- # Private API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Code #-----------------------------------------------------------------------------