Don't use camel cases in Python names

app.py

@@ -25,7 +25,7 @@ def noneIfEmpty(val):
     return None if val == "" else val
 
 
-def computeDepDropdownOptions(reg_code=None):
+def compute_dept_dropdown_options(reg_code=None):
     """Compute department dropdown option list."""
     dep_list = [
         {"label": dep[1], "value": dep[0]}
@@ -34,7 +34,7 @@ def computeDepDropdownOptions(reg_code=None):
     return [{"label": "-- département --", "value": ""}] + dep_list
 
 
-def computeBarFigure(reg_code=None, dep_code=None):
+def compute_bar_figure(reg_code=None, dep_code=None):
     """Build a bar figure from given region and department code."""
 
     df = app_data.df
@@ -62,8 +62,8 @@ app.layout = html.Div(
             ],
             value="",
         ),
-        dcc.Dropdown(id="dep_dd", options=computeDepDropdownOptions(), value="",),
-        dcc.Graph(id="type_bar", figure=computeBarFigure()),
+        dcc.Dropdown(id="dep_dd", options=compute_dept_dropdown_options(), value="",),
+        dcc.Graph(id="type_bar", figure=compute_bar_figure()),
     ]
 )
 
@@ -72,9 +72,9 @@ app.layout = html.Div(
     Output(component_id="dep_dd", component_property="options"),
     [Input(component_id="reg_dd", component_property="value")],
 )
-def update_dep_dropdown_options(reg_code):
+def update_dept_dropdown_options(reg_code):
     """Update department list when a region has been chosen."""
-    return computeDepDropdownOptions(reg_code=noneIfEmpty(reg_code))
+    return compute_dept_dropdown_options(reg_code=noneIfEmpty(reg_code))
 
 
 @app.callback(
@@ -95,7 +95,7 @@ def update_dep_dropdown_value(reg_code):
 )
 def update_type_bar(reg_code, dep_code):
     """Update bar chart when one dropdown value changes."""
-    return computeBarFigure(
+    return compute_bar_figure(
         reg_code=noneIfEmpty(reg_code), dep_code=noneIfEmpty(dep_code)
     )