# create a csv file with a name from encoded string of three concatenated strings
s1 = '100'
s2 = '2012'
s3 = 'Washington University'

import base64
encoded = base64.b64encode((s1+s2+s3).encode())

import os
name = encoded.decode()+'.csv'
location = os.path.join('downloads', name)

with open(location, 'wb') as f:
    f.write(b'Hello World!')

# create a download link
import ipywidgets as widgets
widgets.HTML(
    value='<a href = \"'+location+'\">Download</a>',
)
		

# start voila server
voila --VoilaConfiguration.file_whitelist="['.*']" name.ipynb
        

# create jupyter_notebook_config.py under ~/.jupyter
jupyter notebook --generate-config

# edit jupyter_notebook_config.py
c.NotebookApp.allow_origin = '*' 
c.NotebookApp.allow_remote_access = True

# start jupyter notebook
jupyter notebook
        

s1 = '100'
s2 = '2012'
s3 = 'Washington University'

import base64
encoded = base64.b64encode((s1+s2+s3).encode())

import os
name = encoded.decode()+'.csv'

with open(name, 'wb') as f:
    f.write(b'Hello World!')

import ipywidgets as widgets
widgets.HTML(
    value='<a href = \"'+os.path.join('..', '..', 'files', name)+'\">Download</a>',
)
        

# 1. start jupyter notebook in the projec directory
jupyter notebook

# 2. open project ipynb file

# 3. click 'Voila' button