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[Fix] Support trace-specific color sequences in Plotly Express via templates #5437

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Merged
emilykl merged 13 commits into from
Dec 5, 2025
+75 −3
Merged

[Fix] Support trace-specific color sequences in Plotly Express via templates #5437

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965b3bd
Add trace-specific color sequence support from template.data
antonymilne Nov 26, 2025
83faec8
Support trace-specific color sequences in Plotly Express via templates
antonymilne Nov 26, 2025
7bdec7f
Add trace-specific color sequences in Plotly Express via templates
antonymilne Nov 26, 2025
befea7d
Minor
antonymilne Nov 27, 2025
d578ab4
Format code with ruff
antonymilne Nov 27, 2025
a2dc490
Add CHANGELOG entry for trace-specific color sequences fix
antonymilne Dec 1, 2025
74543f3
Update changelog
antonymilne Dec 1, 2025
675c668
Refactor trace-specific color handling in apply_default_cascade
antonymilne Dec 4, 2025
c24b05c
Remove redundant color_discrete_sequence check in apply_default_cascade
antonymilne Dec 4, 2025
076ff14
Update tests/test_optional/test_px/test_px.py
antonymilne Dec 4, 2025
a3853d2
Ruff
antonymilne Dec 4, 2025
af1546c
Merge branch 'main' into main
antonymilne Dec 4, 2025
e8339e0
Fix imshow
antonymilne Dec 5, 2025
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Ruff
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@antonymilne
antonymilne committed Dec 4, 2025
commit a3853d2afc113cea2fda3ab98b435e745823abfd
6 changes: 3 additions & 3 deletions plotly/express/_core.py
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Expand Up @@ -1053,9 +1053,9 @@ def apply_default_cascade(args, constructor):
if hasattr(trace_data, "marker")
and hasattr(trace_data.marker, "color")
]
# If template contains at least one color for this trace type, assign to color_discrete_sequence
if any(trace_specific_colors):
args["color_discrete_sequence"] = trace_specific_colors
# If template contains at least one color for this trace type, assign to color_discrete_sequence
if any(trace_specific_colors):
args["color_discrete_sequence"] = trace_specific_colors
# fallback to layout.colorway if trace-specific colors not available
if args["color_discrete_sequence"] is None and args["template"].layout.colorway:
args["color_discrete_sequence"] = args["template"].layout.colorway
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3 changes: 1 addition & 2 deletions tests/test_optional/test_px/test_px.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
from itertools import permutations
import warnings

import pandas as pd
import plotly.express as px
import plotly.io as pio
import narwhals.stable.v1 as nw
Expand Down Expand Up @@ -227,8 +228,6 @@ def test_px_templates(backend):


def test_px_templates_trace_specific_colors(backend):
import pandas as pd

tips = px.data.tips(return_type=backend)

# trace-specific colors: each trace type uses its own template colors
Expand Down