【Python】python2 html safe string

import cgi

s = '<>&'
s += u'哈哈'
print type(s)
print s
r = cgi.escape(s)
print type(r)
print r
r = r.encode('gbk')
print type(r)
print r

# <type 'unicode'>
# <>&哈哈
# <type 'unicode'>
# &lt;&gt;&amp;哈哈
# <type 'str'>
# &lt;&gt;&amp;哈哈