Less intrusive default and ruff format

Author: Zomtir

plotly/_subplots.py

@@ -57,7 +57,7 @@ def make_subplots(
     row_titles=None,
     x_title=None,
     y_title=None,
-    font=dict(size=16),
+    font=None,
     figure=None,
     **kwargs,
 ):
@@ -228,7 +228,7 @@ def make_subplots(
         Title to place to the left of the left column of subplots,
         centered vertically
 
-    font: dict (default dict(size=16))
+    font: dict (default None)
         Font used by any title of the subplots.
 
     figure: go.Figure or None (default None)
@@ -818,7 +818,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):
 
     # Add subplot titles
     plot_title_annotations = _build_subplot_title_annotations(
-        subplot_titles, list_of_domains, font = font
+        subplot_titles, list_of_domains, font=font
     )
 
     layout["annotations"] = plot_title_annotations
@@ -839,7 +839,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):
 
         # Add subplot titles
         column_title_annotations = _build_subplot_title_annotations(
-            column_titles, domains_list, font = font
+            column_titles, domains_list, font=font
         )
 
         layout["annotations"] += tuple(column_title_annotations)
@@ -853,7 +853,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):
 
         # Add subplot titles
         column_title_annotations = _build_subplot_title_annotations(
-            row_titles, domains_list, title_edge="right", font = font
+            row_titles, domains_list, title_edge="right", font=font
         )
 
         layout["annotations"] += tuple(column_title_annotations)
@@ -863,7 +863,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):
 
         # Add subplot titles
         column_title_annotations = _build_subplot_title_annotations(
-            [x_title], domains_list, title_edge="bottom", offset=30, font = font
+            [x_title], domains_list, title_edge="bottom", offset=30, font=font
         )
 
         layout["annotations"] += tuple(column_title_annotations)
@@ -873,7 +873,7 @@ def _check_hv_spacing(dimsize, spacing, name, dimvarname, dimname):
 
         # Add subplot titles
         column_title_annotations = _build_subplot_title_annotations(
-            [y_title], domains_list, title_edge="left", offset=40, font = font
+            [y_title], domains_list, title_edge="left", offset=40, font=font
         )
 
         layout["annotations"] += tuple(column_title_annotations)
@@ -1167,7 +1167,7 @@ def _get_cartesian_label(x_or_y, r, c, cnt):
 
 
 def _build_subplot_title_annotations(
-    subplot_titles, list_of_domains, title_edge="top", offset=0, font=dict(size=16)
+    subplot_titles, list_of_domains, title_edge="top", offset=0, font=None
 ):
     # If shared_axes is False (default) use list_of_domains
     # This is used for insets and irregular layouts
@@ -1177,6 +1177,10 @@ def _build_subplot_title_annotations(
     subtitle_pos_x = []
     subtitle_pos_y = []
 
+    # If no font size is provided, use this fallback
+    if font is None:
+        font = {"size": 16}
+
     if title_edge == "top":
         text_angle = 0
         xanchor = "center"