unset marginal ranges

Author: nicolaskruchten

Diff for: CHANGELOG.md

@@ -9,6 +9,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Fixed special cases with `px.sunburst` and `px.treemap` with `path` input ([#2524](https://github.com/plotly/plotly.py/pull/2524))
 - Fixed bug in `hover_data` argument of `px` functions, when the column name is changed with labels and `hover_data` is a dictionary setting up a specific format for the hover data ([#2544](https://github.com/plotly/plotly.py/pull/2544)).
 - Made the Plotly Express `trendline` argument more robust and made it work with datetime `x` values ([#2554](https://github.com/plotly/plotly.py/pull/2554))
+- Plotly Express `range_(x|y)` should not impact the unlinked range of marginal subplots ([#2600](https://github.com/plotly/plotly.py/pull/2600))
 
 ## [4.8.1] - 2020-05-28
 

Diff for: packages/python/plotly/plotly/express/_core.py

@@ -543,14 +543,18 @@ def configure_cartesian_marginal_axes(args, fig, orders):
 
     # Configure axis ticks on marginal subplots
     if args["marginal_x"]:
-        fig.update_yaxes(showticklabels=False, showline=False, ticks="", row=nrows)
+        fig.update_yaxes(
+            showticklabels=False, showline=False, ticks="", range=None, row=nrows
+        )
         if args["template"].layout.yaxis.showgrid is None:
             fig.update_yaxes(showgrid=args["marginal_x"] == "histogram", row=nrows)
         if args["template"].layout.xaxis.showgrid is None:
             fig.update_xaxes(showgrid=True, row=nrows)
 
     if args["marginal_y"]:
-        fig.update_xaxes(showticklabels=False, showline=False, ticks="", col=ncols)
+        fig.update_xaxes(
+            showticklabels=False, showline=False, ticks="", range=None, col=ncols
+        )
         if args["template"].layout.xaxis.showgrid is None:
             fig.update_xaxes(showgrid=args["marginal_y"] == "histogram", col=ncols)
         if args["template"].layout.yaxis.showgrid is None:

Diff for: packages/python/plotly/plotly/tests/test_core/test_px/test_px.py

@@ -238,3 +238,18 @@ def test_permissive_defaults():
     msg = "'PxDefaults' object has no attribute 'should_not_work'"
     with pytest.raises(AttributeError, match=msg):
         px.defaults.should_not_work = "test"
+
+
+def test_marginal_ranges():
+    df = px.data.tips()
+    fig = px.scatter(
+        df,
+        x="total_bill",
+        y="tip",
+        marginal_x="histogram",
+        marginal_y="histogram",
+        range_x=[5, 10],
+        range_y=[5, 10],
+    )
+    assert fig.layout.xaxis2.range is None
+    assert fig.layout.yaxis3.range is None