Скачать или смотреть The dropdown in a python data app plotly dash

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certainly! in this tutorial, we'll explore how to create a dropdown menu in a plotly dash application. dash is a powerful framework for building web applications in python, especially for data visualization.

overview of dash dropdowns

a dropdown in dash allows users to select an option from a list. depending on the selected option, you can update other components of the app, such as graphs, tables, or text outputs.

prerequisites

to follow along, ensure you have the following packages installed:



step-by-step guide to creating a dropdown in dash

1. **import necessary libraries**: first, we need to import the required dash components and libraries.

2. **create the dash app**: initialize your dash app.

3. **define the layout**: this includes defining the dropdown component.

4. **create callbacks**: set up callbacks to update the output based on the selected dropdown value.

5. **run the app**: finally, run the dash app.

example code

here's a simple example of a dash application that features a dropdown menu. users can select a fruit from the dropdown, and the app will display a corresponding message with the selected fruit.



explanation of the code

1. **import libraries**: we import `dash`, `dash_core_components` (for dropdowns), and `dash_html_components` (for html elements).

2. **create a dash app**: the `dash.dash()` class is instantiated to create the app.

3. **define the layout**:
we use `html.div` to create a container for the app.
the `dcc.dropdown` component is created, where:
`id` is used to reference the component in callbacks.
`options` is a list of dictionaries specifying the labels and values for the dropdown.
`value` sets the default selected value.
`multi` allows multiple selections (set to `false` for single selection).
`clearable` specifies if the user can clear the selection.

4. **create callbacks**:
the `@app.callback` decorator is used to define a callback that u ...

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