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fix base64 code in nbformat.v2...
fix base64 code in nbformat.v2 base64 encoding functions were called, but had no effect, because the notebook already has everything as b64-encoded bytestrings, which are valid ascii literals on Python 2. However, the encode/decode logic is actually triggered on Python 3, revealing its errors. This fixes the base64 functions that had no effect to have their intended effect, but does not use them. Rather, it is assumed that bytes objects are already b64-encoded (and thus ascii-safe), which assumption was already made in Python 2.

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svg.py
89 lines | 2.3 KiB | text/x-python | PythonLexer
""" Defines utility functions for working with SVG documents in Qt.
"""
# System library imports.
from IPython.external.qt import QtCore, QtGui, QtSvg
def save_svg(string, parent=None):
""" Prompts the user to save an SVG document to disk.
Parameters:
-----------
string : basestring
A Python string containing a SVG document.
parent : QWidget, optional
The parent to use for the file dialog.
Returns:
--------
The name of the file to which the document was saved, or None if the save
was cancelled.
"""
if isinstance(string, unicode):
string = string.encode('utf-8')
dialog = QtGui.QFileDialog(parent, 'Save SVG Document')
dialog.setAcceptMode(QtGui.QFileDialog.AcceptSave)
dialog.setDefaultSuffix('svg')
dialog.setNameFilter('SVG document (*.svg)')
if dialog.exec_():
filename = dialog.selectedFiles()[0]
f = open(filename, 'w')
try:
f.write(string)
finally:
f.close()
return filename
return None
def svg_to_clipboard(string):
""" Copy a SVG document to the clipboard.
Parameters:
-----------
string : basestring
A Python string containing a SVG document.
"""
if isinstance(string, unicode):
string = string.encode('utf-8')
mime_data = QtCore.QMimeData()
mime_data.setData('image/svg+xml', string)
QtGui.QApplication.clipboard().setMimeData(mime_data)
def svg_to_image(string, size=None):
""" Convert a SVG document to a QImage.
Parameters:
-----------
string : basestring
A Python string containing a SVG document.
size : QSize, optional
The size of the image that is produced. If not specified, the SVG
document's default size is used.
Raises:
-------
ValueError
If an invalid SVG string is provided.
Returns:
--------
A QImage of format QImage.Format_ARGB32.
"""
if isinstance(string, unicode):
string = string.encode('utf-8')
renderer = QtSvg.QSvgRenderer(QtCore.QByteArray(string))
if not renderer.isValid():
raise ValueError('Invalid SVG data.')
if size is None:
size = renderer.defaultSize()
image = QtGui.QImage(size, QtGui.QImage.Format_ARGB32)
painter = QtGui.QPainter(image)
renderer.render(painter)
return image