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Uploads / Async

Upload files from an interactive app.

import os
from h2o_wave import main, app, Q, ui

def write_csv(filename, rows):
with open(filename, 'w', encoding='utf-8') as f:
f.write('\n'.join([','.join([str(x) for x in row]) for row in rows]))

async def serve(q: Q):
if q.args.generate_csv:
# Generate
write_csv('squares.csv', [[x, x * x] for x in range(1, 1 + q.args.row_count)])
# Upload
download_path, = await['squares.csv'])
# Clean up

# Display link['example'].items = [
ui.text_xl('Squares Generated!'),
ui.text(f'[Download my {q.args.row_count} squares!]({download_path})'),
ui.button(name='show_form', label='Back', primary=True),
# Accept a row count from the user['example'] = ui.form_card(box='1 1 4 7', items=[
ui.text_xl('Square Generator'),
ui.slider(name='row_count', label='Squares to generate', min=0, max=100, step=10, value=30),
ui.button(name='generate_csv', label='Generate', primary=True),

Tags:  upload