Created
October 2, 2019 19:44
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Answer: Applying paginator to images
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import streamlit as st | |
import itertools | |
def paginator(label, items, items_per_page=10, on_sidebar=True): | |
"""Lets the user paginate a set of items. | |
Parameters | |
---------- | |
label : str | |
The label to display over the pagination widget. | |
items : Iterator[Any] | |
The items to display in the paginator. | |
items_per_page: int | |
The number of items to display per page. | |
on_sidebar: bool | |
Whether to display the paginator widget on the sidebar. | |
Returns | |
------- | |
Iterator[Tuple[int, Any]] | |
An iterator over *only the items on that page*, including | |
the item's index. | |
Example | |
------- | |
This shows how to display a few pages of fruit. | |
>>> fruit_list = [ | |
... 'Kiwifruit', 'Honeydew', 'Cherry', 'Honeyberry', 'Pear', | |
... 'Apple', 'Nectarine', 'Soursop', 'Pineapple', 'Satsuma', | |
... 'Fig', 'Huckleberry', 'Coconut', 'Plantain', 'Jujube', | |
... 'Guava', 'Clementine', 'Grape', 'Tayberry', 'Salak', | |
... 'Raspberry', 'Loquat', 'Nance', 'Peach', 'Akee' | |
... ] | |
... | |
... for i, fruit in paginator("Select a fruit page", fruit_list): | |
... st.write('%s. **%s**' % (i, fruit)) | |
""" | |
# Figure out where to display the paginator | |
if on_sidebar: | |
location = st.sidebar.empty() | |
else: | |
location = st.empty() | |
# Display a pagination selectbox in the specified location. | |
items = list(items) | |
n_pages = len(items) | |
n_pages = (len(items) - 1) // items_per_page + 1 | |
page_format_func = lambda i: "Page %s" % i | |
page_number = location.selectbox(label, range(n_pages), format_func=page_format_func) | |
# Iterate over the items in the page to let the user display them. | |
min_index = page_number * items_per_page | |
max_index = min_index + items_per_page | |
return itertools.islice(enumerate(items), min_index, max_index) | |
def demonstrate_image_pagination(): | |
sunset_imgs = [ | |
'https://unsplash.com/photos/-IMlv9Jlb24/download?force=true', | |
'https://unsplash.com/photos/ESEnXckWlLY/download?force=true', | |
'https://unsplash.com/photos/mOcdke2ZQoE/download?force=true', | |
'https://unsplash.com/photos/GPPAjJicemU/download?force=true', | |
'https://unsplash.com/photos/JFeOy62yjXk/download?force=true', | |
'https://unsplash.com/photos/kEgJVDkQkbU/download?force=true', | |
'https://unsplash.com/photos/i9Q9bc-WgfE/download?force=true', | |
'https://unsplash.com/photos/tIL1v1jSoaY/download?force=true', | |
'https://unsplash.com/photos/-G3rw6Y02D0/download?force=true', | |
'https://unsplash.com/photos/xP_AGmeEa6s/download?force=true', | |
'https://unsplash.com/photos/4iTVoGYY7bM/download?force=true', | |
'https://unsplash.com/photos/mBQIfKlvowM/download?force=true', | |
'https://unsplash.com/photos/A-11N8ItHZo/download?force=true', | |
'https://unsplash.com/photos/kOqBCFsGTs8/download?force=true', | |
'https://unsplash.com/photos/8DMuvdp-vso/download?force=true' | |
] | |
image_iterator = paginator("Select a sunset page", sunset_imgs) | |
indices_on_page, images_on_page = map(list, zip(*image_iterator)) | |
st.image(images_on_page, width=100, caption=indices_on_page) | |
if __name__ == '__main__': | |
demonstrate_image_pagination() | |
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