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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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Add trace-specific color sequence support from template.data 
- Check template.data.<trace_type> for marker.color or line.color before falling back to template.layout.colorway
- Handle timeline special case (maps to bar trace type)
- Use marker colors first, fall back to line colors if no markers found
- Fixes issue #5416
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@antonymilne
antonymilne committed Nov 26, 2025
commit 965b3bdc18a6e2fa10fbbded0751a83d2fce8812
23 changes: 21 additions & 2 deletions plotly/express/_core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1003,7 +1003,7 @@ def one_group(x):
return ""


def apply_default_cascade(args):
def apply_default_cascade(args, constructor=None):
# first we apply px.defaults to unspecified args

for param in defaults.__slots__:
Expand Down Expand Up @@ -1038,6 +1038,25 @@ def apply_default_cascade(args):
args["color_continuous_scale"] = sequential.Viridis

if "color_discrete_sequence" in args:
if args["color_discrete_sequence"] is None and constructor is not None:
if constructor == "timeline":
trace_type = "bar"
else:
trace_type = constructor().type
if trace_data_list := getattr(args["template"].data, trace_type, None):
collected_colors = [
trace_data.marker.color
for trace_data in trace_data_list
if hasattr(trace_data, "marker")
]
if not collected_colors:
collected_colors = [
trace_data.line.color
for trace_data in trace_data_list
if hasattr(trace_data, "line")
]
if collected_colors:
args["color_discrete_sequence"] = collected_colors
if args["color_discrete_sequence"] is None and args["template"].layout.colorway:
args["color_discrete_sequence"] = args["template"].layout.colorway
if args["color_discrete_sequence"] is None:
Expand Down Expand Up @@ -2486,7 +2505,7 @@ def get_groups_and_orders(args, grouper):
def make_figure(args, constructor, trace_patch=None, layout_patch=None):
trace_patch = trace_patch or {}
layout_patch = layout_patch or {}
apply_default_cascade(args)
apply_default_cascade(args, constructor=constructor)

args = build_dataframe(args, constructor)
if constructor in [go.Treemap, go.Sunburst, go.Icicle] and args["path"] is not None:
Expand Down