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import streamlit as st
import pickle
import pandas as pd
import json
import base64
import uuid
import re
import importlib.util
def import_from_file(module_name: str, filepath: str):
"""
Imports a module from file.
Args:
module_name (str): Assigned to the module's __name__ parameter (does not
influence how the module is named outside of this function)
filepath (str): Path to the .py file
Returns:
The module
"""
spec = importlib.util.spec_from_file_location(module_name, filepath)
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
return module
def notebook_header(text):
"""
Insert section header into a jinja file, formatted as notebook cell.
Leave 2 blank lines before the header.
"""
return f"""# # {text}
"""
def code_header(text):
"""
Insert section header into a jinja file, formatted as Python comment.
Leave 2 blank lines before the header.
"""
seperator_len = (75 - len(text)) / 2
seperator_len_left = math.floor(seperator_len)
seperator_len_right = math.ceil(seperator_len)
return f"# {'-' * seperator_len_left} {text} {'-' * seperator_len_right}"
def to_notebook(code):
"""Converts Python code to Jupyter notebook format."""
notebook = jupytext.reads(code, fmt="py")
return jupytext.writes(notebook, fmt="ipynb")
def open_link(url, new_tab=True):
"""Dirty hack to open a new web page with a streamlit button."""
# From: https://discuss.streamlit.io/t/how-to-link-a-button-to-a-webpage/1661/3
if new_tab:
js = f"window.open('{url}')" # New tab or window
else:
js = f"window.location.href = '{url}'" # Current tab
html = '<img src onerror="{}">'.format(js)
div = Div(text=html)
st.bokeh_chart(div)
def download_button(object_to_download, download_filename, button_text):
"""
Generates a link to download the given object_to_download.
From: https://discuss.streamlit.io/t/a-download-button-with-custom-css/4220
Params:
------
object_to_download: The object to be downloaded.
download_filename (str): filename and extension of file. e.g. mydata.csv,
some_txt_output.txt download_link_text (str): Text to display for download
link.
button_text (str): Text to display on download button (e.g. 'click here to download file')
pickle_it (bool): If True, pickle file.
Returns:
-------
(str): the anchor tag to download object_to_download
Examples:
--------
download_link(your_df, 'YOUR_DF.csv', 'Click to download data!')
download_link(your_str, 'YOUR_STRING.txt', 'Click to download text!')
"""
# if:
if isinstance(object_to_download, bytes):
pass
elif isinstance(object_to_download, pd.DataFrame):
object_to_download = object_to_download.to_csv(index=False)
# Try JSON encode for everything else
else:
object_to_download = json.dumps(object_to_download)
try:
# some strings <-> bytes conversions necessary here
b64 = base64.b64encode(object_to_download.encode()).decode()
except AttributeError as e:
b64 = base64.b64encode(object_to_download).decode()
button_uuid = str(uuid.uuid4()).replace("-", "")
button_id = re.sub("\d+", "", button_uuid)
custom_css = f"""
<style>
#{button_id} {{
display: inline-flex;
align-items: center;
justify-content: center;
background-color: rgb(255, 255, 255);
color: rgb(38, 39, 48);
padding: .25rem .75rem;
position: relative;
text-decoration: none;
border-radius: 4px;
border-width: 1px;
border-style: solid;
border-color: rgb(230, 234, 241);
border-image: initial;
}}
#{button_id}:hover {{
border-color: rgb(246, 51, 102);
color: rgb(246, 51, 102);
}}
#{button_id}:active {{
box-shadow: none;
background-color: rgb(246, 51, 102);
color: white;
}}
</style> """
dl_link = (
custom_css
+ f'<a download="{download_filename}" id="{button_id}" href="data:file/txt;base64,{b64}">{button_text}</a><br><br>'
)
st.markdown(dl_link, unsafe_allow_html=True)
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