Python字典遇到的value中遇到None跳出問題

hosts?=?{"a":"111",?"b":None,?"c":"333"}

hname?=?""

for?(k,v)?in?hosts.items():

if?v?==?None:

print?"key:?%s,?value=?"?%?(k)

else:

print?"key:?%s,?value?=?%s"?%?(k,?v)

#key:?a,?value?=?111

#key:?c,?value?=?333

#key:?b,?value=