python 可接受任意参数的函数

def avg(first, *rest): return (first + sum(rest)) / (1 + len(rest))

Sample use

avg(1, 2) # 1.5 avg(1, 2, 3, 4) # 2.5

import html

def make_element(name, value, **attrs): keyvals = [' %s="%s"' % item for item in attrs.items()] attr_str = ''.join(keyvals) element = '<{name}{attrs}>{value}</{name}>'.format( name=name, attrs=attr_str, value=html.escape(value)) return element

Example

Creates '<item size="large" quantity="6">Albatross</item>'

make_element('item', 'Albatross', size='large', quantity=6)

Creates '<p><spam></p>'

make_element('p', '<spam>')