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Set axis linecolor to black by default when converting from matplotlib #5311

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Set axis linecolor to black by default when converting from matplotlib #5311

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Set axis linecolor to black by default when converting from matplotli…
robertoffmoura Aug 8, 2025
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robertoffmoura Aug 12, 2025
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Set axis linecolor to black by default when converting from matplotli… 
…b figure
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@robertoffmoura
robertoffmoura committed Oct 9, 2025
commit 08b9e443ad29cd67fcf0c9b066400087158e4e8e
4 changes: 2 additions & 2 deletions plotly/matplotlylib/renderer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -154,10 +154,10 @@ def open_axes(self, ax, props):
self.axis_ct += 1
# set defaults in axes
xaxis = go.layout.XAxis(
anchor="y{0}".format(self.axis_ct), zeroline=False, ticks="inside"
anchor="y{0}".format(self.axis_ct), zeroline=False, ticks="inside", linecolor="black"
)
yaxis = go.layout.YAxis(
anchor="x{0}".format(self.axis_ct), zeroline=False, ticks="inside"
anchor="x{0}".format(self.axis_ct), zeroline=False, ticks="inside", linecolor="black"
)
# update defaults with things set in mpl
mpl_xaxis, mpl_yaxis = mpltools.prep_xy_axis(
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10 changes: 10 additions & 0 deletions plotly/matplotlylib/tests/test_renderer.py
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Expand Up @@ -84,3 +84,13 @@ def test_multiple_traces_native_legend():
assert plotly_fig.data[0].mode == "lines"
assert plotly_fig.data[1].mode == "markers"
assert plotly_fig.data[2].mode == "lines+markers"


def test_axis_linecolor_defaults_to_black():
fig, ax = plt.subplots()
ax.plot([0, 1], [0, 1])

plotly_fig = tls.mpl_to_plotly(fig)

assert plotly_fig.layout.xaxis.linecolor == "black"
assert plotly_fig.layout.yaxis.linecolor == "black"