python singledispatch函数分发器

r""" htmlize(): generic function example

BEGIN HTMLIZE_DEMO

htmlize({1, 2, 3}) # <1> '<pre>{1, 2, 3}</pre>' htmlize(abs) '<pre><built-in function abs></pre>' htmlize('Heimlich & Co.\n- a game') # <2> '<p>Heimlich & Co. \n- a game</p>' htmlize(42) # <3> '<pre>42 (0x2a)</pre>' print(htmlize(['alpha', 66, {3, 2, 1}])) # <4> <ul> <li><p>alpha</p></li> <li><pre>66 (0x42)</pre></li> <li><pre>{1, 2, 3}</pre></li> </ul>

END HTMLIZE_DEMO

"""

BEGIN HTMLIZE

from functools import singledispatch from collections import abc import numbers import html

@singledispatch # <1> def htmlize(obj): content = html.escape(repr(obj)) return '<pre>{}</pre>'.format(content)

@htmlize.register(str) # <2> def _(text): # <3> content = html.escape(text).replace('\n', ' \n') return '<p>{0}</p>'.format(content)

@htmlize.register(numbers.Integral) # <4> def _(n): return '<pre>{0} (0x{0:x})</pre>'.format(n)

@htmlize.register(tuple) # <5> @htmlize.register(abc.MutableSequence) def _(seq): inner = '</li>\n<li>'.join(htmlize(item) for item in seq) return '<ul>\n<li>' + inner + '</li>\n</ul>'

END HTMLIZE