I guess it's the problem with lib2to3/fixes/fix_urllib.py. Indentation is not taken into consideration when fix "import". Fix it with indentation taken into consideration maybe a little complex, but here is a simple and ugly fix: when one import statement was transformed to two or more statement, use semicolon(';') instead of '\n' as separator, between many import statements. In this case, the 
"""
def fun():
    from urllib import urlopen, urlencode
"""

is transformed in to:

"""
def fun():
    from urllib.request import urlopen;from urllib.parse import urlencode
"""

It will takes time to work out a better fix.