requirement.txt to run bokeh application on heroku

Question

I want to run a bokeh app on heroku. As an example, I can give the following code I took from this website.

import numpy as np
from numpy import pi

from bokeh.client import push_session
from bokeh.driving import cosine
from bokeh.plotting import figure, curdoc

x = np.linspace(0, 4*pi, 80)
y = np.sin(x)

p = figure()
r1 = p.line([0, 4*pi], [-1, 1], color="firebrick")
r2 = p.line(x, y, color="navy", line_width=4)

# open a session to keep our local document in sync with server
session = push_session(curdoc())

@cosine(w=0.03)
def update(step):
    # updating a single column of the the *same length* is OK
    r2.data_source.data["y"] = y * step
    r2.glyph.line_alpha = 1 - 0.8 * abs(step)

curdoc().add_periodic_callback(update, 50)

session.show(p) # open the document in a browser

session.loop_until_closed() # run forever

So, to run this on heroku, I've found that, I need to do the steps explained in this answer.

However, it is not stated here or somewhere else what should I add to the requirements.txt file when I use bokeh. Is there anyone who can help me about this and other things that I need to do for running a bokeh app on heroku?

The easiest way to create a `requirements.txt` file, assuming you already have the code running locally with everything installed, is `pip freeze > requirements.txt`. Note that if you don't use a per-project virtualenv this will probably contain a bunch of stuff you actually don't need. — jonrsharpe, Mar 27 '17 at 21:05
Alternatively if you are using `conda` you can run `conda list --export` but the very short list of requirements is also given below. — bigreddot, Apr 18 '17 at 01:42

score 0 · Answer 1 · answered Apr 11 '17 at 23:24

The list of runtime requirements for Bokeh is veryy short. They are given in the project setup.py:

REQUIRES = [
    'six >=1.5.2',
    'requests >=1.2.3',
    'PyYAML >=3.10',
    'python-dateutil >=2.1',
    'Jinja2 >=2.7',
    'numpy >=1.7.1',
    'tornado >=4.3',
]

# handle the compat difference for futures 
if sys.version_info[:2] == (2, 7):
    REQUIRES.append('futures >=3.0.3')

There are some optional dependencies. bokeh.charts depends on Pandas, and using custom extensions depends on having NodeJS installed (via conda or some other means)

requirement.txt to run bokeh application on heroku

1 Answers1