Migrate 000-penguins to shiny express

docs/apps/000-penguins/app.py

@@ -0,0 +1,57 @@
+from pathlib import Path
+
+import pandas as pd
+import seaborn as sns
+
+from shiny.express import input, render, ui
+from shiny import reactive, req
+
+sns.set_theme()
+
+df = pd.read_csv(Path(__file__).parent / "penguins.csv", na_values="NA")
+numeric_cols = df.select_dtypes(include=["float64"]).columns.tolist()
+species = df["Species"].unique().tolist()
+species.sort()
+
+
+with ui.layout_sidebar():
+    with ui.sidebar():
+        ui.input_selectize(
+            "xvar", "X variable", numeric_cols, selected="Bill Length (mm)"
+        )
+        ui.input_selectize(
+            "yvar", "Y variable", numeric_cols, selected="Bill Depth (mm)"
+        )
+        ui.input_checkbox_group(
+            "species", "Filter by species", species, selected=species
+        )
+        ui.hr()
+        ui.input_switch("by_species", "Show species", value=True)
+        ui.input_switch("show_margins", "Show marginal plots", value=True)
+
+    @render.plot
+    def scatter():
+        """Generates a plot for Shiny to display to the user"""
+
+        # The plotting function to use depends on whether margins are desired
+        plotfunc = sns.jointplot if input.show_margins() else sns.scatterplot
+
+        plotfunc(
+            data=filtered_df(),
+            x=input.xvar(),
+            y=input.yvar(),
+            hue="Species" if input.by_species() else None,
+            hue_order=species,
+            legend=False,
+        )
+
+@reactive.calc
+def filtered_df() -> pd.DataFrame:
+    """Returns a Pandas data frame that includes only the desired rows"""
+
+    # This calculation "requires" that at least one species is selected
+    req(len(input.species()) > 0)
+
+    # Filter the rows so we only include the desired species
+    return df[df["Species"].isin(input.species())]
+

apps/examples/0.0-penguins/app.py → docs/apps/000-penguins/app_core.py

@@ -3,7 +3,6 @@
 import pandas as pd
 import seaborn as sns
 
-import shiny.experimental as x
 from shiny import App, Inputs, Outputs, Session, reactive, render, req, ui
 
 sns.set_theme()

docs/shiny-express-slides.qmd

@@ -75,7 +75,7 @@ We need to tell the compute what to do when the user clicks.
 # | output: asis
 
 include_shiny_folder(
-    "../apps/examples/0.0-penguins", components="viewer", viewer_height=700
+    "apps/000-penguins", components="viewer", viewer_height=700
 )
 ```