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=