monitor/cherrypy/tutorial/tut08_generators_and_yield.py

   1 """
   2 Bonus Tutorial: Using generators to return result bodies
   3
   4 Instead of returning a complete result string, you can use the yield
   5 statement to return one result part after another. This may be convenient
   6 in situations where using a template package like CherryPy or Cheetah
   7 would be overkill, and messy string concatenation too uncool. ;-)
   8 """
   9
  10 import cherrypy
  11
  12
  13 class GeneratorDemo:
  14
  15     def header(self):
  16         return "<html><body><h2>Generators rule!</h2>"
  17
  18     def footer(self):
  19         return "</body></html>"
  20
  21     def index(self):
  22         # Let's make up a list of users for presentation purposes
  23         users = ['Remi', 'Carlos', 'Hendrik', 'Lorenzo Lamas']
  24
  25         # Every yield line adds one part to the total result body.
  26         yield self.header()
  27         yield "<h3>List of users:</h3>"
  28
  29         for user in users:
  30             yield "%s<br/>" % user
  31
  32         yield self.footer()
  33     index.exposed = True
  34
  35
  36 import os.path
  37 tutconf = os.path.join(os.path.dirname(__file__), 'tutorial.conf')
  38
  39 if __name__ == '__main__':
  40     # CherryPy always starts with app.root when trying to map request URIs
  41     # to objects, so we need to mount a request handler root. A request
  42     # to '/' will be mapped to HelloWorld().index().
  43     cherrypy.quickstart(GeneratorDemo(), config=tutconf)
  44 else:
  45     # This branch is for the test suite; you can ignore it.
  46     cherrypy.tree.mount(GeneratorDemo(), config=tutconf)
  47