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Tornado (a Python based web-server) doesn’t like writing int’s. However, it will write strings and dicts. Casting to a string solves the problem.

This is the error traceback I was seeing. The server was returning a 500 error.

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/tornado/web.py", line 927, in _execute
    getattr(self, self.request.method.lower())(*args, **kwargs)
  File "second_breakfast.py", line 10, in get
    self.write(result)
  File "/usr/lib/python2.7/site-packages/tornado/web.py", line 446, in write
    chunk = utf8(chunk)
  File "/usr/lib/python2.7/site-packages/tornado/escape.py", line 159, in utf8
    assert isinstance(value, unicode)
AssertionError