Examples for using pants build to build a simple flask app

BUILD-multiple-files

python_binary(
  name='theapp',
  dependencies=[
    '3rdparty/python:Flask',
    '3rdparty/python:gevent',
    ':theapp_lib'
  ],
  resources=globs('static/*', 'templates/*'),
  source='main.py'
)

python_library(
  name='theapp_lib',
  sources=globs('*.py')
)

BUILD-single-file

python_binary(
  name='theapp',
  dependencies=[
    '3rdparty/python:Flask',
    '3rdparty/python:gevent',
  ],
  resources=globs('static/*', 'templates/*'),
  source=theapp.py,
  zip_safe=False
)

flaskapp.py

#!/usr/bin/env python
from gevent import monkey; monkey.patch_all()
from flask import Flask, jsonify, render_template, request
from functools import wraps
from optparse import OptionParser
import logging, os, sys
from gevent.wsgi import WSGIServer

TEMPLATE_DIR = os.path.join(os.path.dirname(__file__), 'templates')

# simple cacher
def cache_for(duration):
  def decorator(func):
    memoized_values = defaultdict(lambda: {'last_load':0, 'value':None})
    @wraps(func)
    def wrapper(*args, **kwargs):
      entry = memoized_values["%s%s" % (args, kwargs)]
      if entry['last_load'] + duration < time():
        entry['last_load'] = time()
        entry['value'] = func(*args, **kwargs)
      return entry['value']
    return wrapper
  return decorator


#######################
# Start the flask stuff
app = Flask(__name__, template_folder=TEMPLATE_DIR)

@app.route('/')
def index():
  return render_template('index.html')

def main(argv=None):
  parser = OptionParser("%prog [options]")
  parser.add_option("-d", "--debug", dest="debug", default=False, action="store_true", help="start in debug mode")
  options, args = parser.parse_args(sys.argv[1:])

  if options.debug:
    app.run(host='0.0.0.0', port=5000, debug=True)
  else:
    http_server = WSGIServer(('', 5000), app)
    http_server.serve_forever()

if __name__ == '__main__':
  main()

Can you explain what the exact problem you want to solve?