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Integration with viewers
------------------------
On platforms such as Windows, viewer programs opened by :meth:`~.Graph.render`
with ``view=True`` (or equivalently with the :meth:`~.Graph.view` shortcut-method)
might **lock** the (PDF, PNG, etc.) file for as long as the viewer is open
(blocking re-rendering it with a ``Permission denied`` error).
.. tip::
You can use the :func:`tempfile.mktemp` function
from the stdlib :mod:`tempfile` module to render to a different file
for each invocation. This avoids needing to close the viewer window
each time within such an incremental workflow
(and also serves to preserves the intermediate steps).
.. doctest::
>>> import tempfile # doctest: +NO_EXE
>>> import graphviz
>>> g = graphviz.Graph()
>>> g.node('spam')
.. doctest::
>>> doctest_mark_exe() # skip this line
>>> g.view(tempfile.mktemp('.gv')) # doctest: +SKIP
'C:\\Users\\User\\AppData\\Local\\Temp\\tmp3aoie8d0.gv.pdf'
>>> g.view(tempfile.mktemp('.gv')) # doctest: +SKIP
'C:\\Users\\User\\AppData\\Local\\Temp\\tmphh4ig7a_.gv.pdf'
Other options:
- use a viewer that `support live updates <live viewer updates_>`_
- use the `Jupyter notebook`_ or `Qt Console <Jupyter Qt Console_>`_
(display the current version of the rendered graph
in repeated add/render/view cycles)
.. include:: _links.rst
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