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Support specifying default renderer using PLOTLY_RENDERER env variable #1578

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May 27, 2019
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26 changes: 19 additions & 7 deletions plotly/io/_renderers.py
Original file line number Diff line number Diff line change
Expand Up @@ -401,15 +401,27 @@ def show(fig, renderer=None, validate=True, **kwargs):
# Version 4 renderer configuration
default_renderer = None

# Try to detect environment so that we can enable a useful
# default renderer
if ipython and ipython.get_ipython():
# Handle the PLOTLY_RENDERER environment variable
env_renderer = os.environ.get('PLOTLY_RENDERER', None)
if env_renderer:
try:
import google.colab
renderers._validate_coerce_renderers(env_renderer)
except ValueError:
raise ValueError("""
Invalid named renderer(s) specified in the 'PLOTLY_RENDERER'
environment variable: {env_renderer}""".format(env_renderer=env_renderer))

default_renderer = env_renderer
elif ipython and ipython.get_ipython():
# Try to detect environment so that we can enable a useful
# default renderer
if not default_renderer:
try:
import google.colab

default_renderer = 'colab'
except ImportError:
pass
default_renderer = 'colab'
except ImportError:
pass

# Check if we're running in a Kaggle notebook
if not default_renderer and os.path.exists('/kaggle/input'):
Expand Down