Express translation of shiny/api-examples/input_action_button

shiny/api-examples/input_action_button/app-express.py

@@ -0,0 +1,20 @@
+import matplotlib.pyplot as plt
+import numpy as np
+
+from shiny import reactive, render
+from shiny.express import input, ui
+
+ui.input_slider("n", "Number of observations", min=0, max=1000, value=500)
+ui.input_action_button("go", "Go!", class_="btn-success")
+
+
+@render.plot(alt="A histogram")
+# Use reactive.event() to invalidate the plot only when the button is pressed
+# (not when the slider is changed)
+@reactive.event(input.go, ignore_none=False)
+def plot():
+    np.random.seed(19680801)
+    x = 100 + 15 * np.random.randn(input.n())
+    fig, ax = plt.subplots()
+    ax.hist(x, bins=30, density=True)
+    return fig