>>> soup = BeautifulSoup("Foo")
>>> soup.a.append("Bar")
>>> soup
FooBar
>>> soup.a.contents
[u'Foo', u'Bar']
上面代码执行后，soup.a.contents 列表中有两项内容，但是下面代码执行后，列表中却只有一项内容，为何会有这个差别？感谢指点！
>>> soup = BeautifulSoup("FooBar")
>>> soup
FooBar
>>> soup.a.contents
['FooBar']
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