How to hand-optimize code

import string, types

def dictser(dict, ListType=types.ListType, isinstance=isinstance):

L = []

group = dict.get("main")

if group:

for key in group.keys():

value = group[key]

if isinstance(value, ListType):

for item in value:

L.extend([" ", key, " = ", item, "\n"])

else:

L.extend([" ", key, " = ", value, "\n"])

...

return string.join(L, "")

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