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Small, self-contained snippets and full apps that show PythonNative's component model and patterns. Each example is also runnable inside a project scaffolded with pn init.
| Page | What it covers |
|---|---|
| Hello world | The smallest possible app and how it boots. |
| Counter | use_state, event handlers, and basic styling. |
| Forms | TextInput, controlled inputs, validation, submit. |
| Lists | FlatList, keyed children, dynamic rendering. |
| Navigation | Typed screens, stack, tab, and drawer navigators, and nesting. |
| Collapsing header & bottom sheet | Scroll-driven animation, Animated.event, gestures, and stacking. |
The repository also includes runnable projects with their own setup instructions:
pn init my-app
cd my-app
# Edit app/main.py and paste any of the snippets below.
pn preview # dev server + browser preview with Fast Refresh
pn run android # or: pn run iosThe app/main.py that pn init writes already renders a small counter with a detail screen; replace it with one of the snippets to try a different example. The quickest way to iterate is pn preview, which renders the app in a browser tab and Fast Refreshes on every save; pn run puts it on a device or simulator connected to the same dev server.
Compose small components and pass them as children:
import pythonnative as pn
@pn.component
def LabeledInput(label: str = "", placeholder: str = "") -> pn.Node:
return pn.Column(
pn.Text(label, style={"font_size": 14, "bold": True}),
pn.TextInput(placeholder=placeholder),
style={"gap": 4},
)
@pn.component
def SignUp() -> pn.Node:
return pn.ScrollView(
pn.Column(
pn.Text("Sign up", style={"font_size": 24, "bold": True}),
LabeledInput(label="Name", placeholder="Enter your name"),
LabeledInput(label="Email", placeholder="you@example.com"),
pn.Button("Submit", on_press=lambda: print("submitted")),
style={"gap": 12, "padding": 16},
)
)from dataclasses import replace
import pythonnative as pn
LIGHT = replace(pn.LIGHT_THEME, colors=replace(pn.LIGHT_THEME.colors, primary="#0A84FF"))
DARK = replace(pn.DARK_THEME, colors=replace(pn.DARK_THEME.colors, primary="#64D2FF"))
class HeaderStyles:
def __init__(self, theme: pn.Theme) -> None:
self.title: pn.Style = {**theme.typography.title, "color": theme.colors.primary}
self.container = pn.style(padding=theme.spacing.md, background_color=theme.colors.background)
@pn.component
def Header() -> pn.Node:
styles = pn.use_styles(HeaderStyles) # rebuilt only when the theme changes
return pn.View(pn.Text("Hello", style=styles.title), style=styles.container)
@pn.component
def App() -> pn.Node:
return pn.ThemeProvider(Header(), light=LIGHT, dark=DARK)ThemeProvider picks LIGHT or DARK from the color scheme, and the navigators use the same theme. See Styling.
@pn.component
def Risky() -> pn.Node:
raise RuntimeError("oops")
@pn.component
def Safe() -> pn.Node:
return pn.ErrorBoundary(
Risky(),
fallback=lambda exc: pn.Text(f"Failed: {exc}"),
)@pn.component
def LayoutShowcase() -> pn.Node:
return pn.Column(
pn.Row(
pn.View(style={"flex": 1, "height": 60, "background_color": "#FAD"}),
pn.View(style={"flex": 2, "height": 60, "background_color": "#ADF"}),
pn.View(style={"flex": 1, "height": 60, "background_color": "#DFA"}),
style={"gap": 8, "align_items": "stretch"},
),
pn.View(
pn.View(style={"position": "absolute", "top": 8, "left": 8,
"width": 32, "height": 32,
"background_color": "#F00"}),
pn.View(style={"position": "absolute", "bottom": 8, "right": 8,
"width": 32, "height": 32,
"background_color": "#0A0"}),
style={"width": 200, "height": 120, "background_color": "#EEE"},
),
style={"gap": 12, "padding": 16},
)See Layout engine for the full set of supported flexbox features.
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