class UnicodeStreamFilter:

    def __init__(self, target):

        self.target = target

        self.encoding = 'utf-8'

        self.errors = 'replace'

        self.encode_to = self.target.encoding

    def write(self, s):

        if type(s) == str:

            s = s.decode("utf-8")

        s = s.encode(self.encode_to, self.errors).decode(self.encode_to)

        self.target.write(s)  

if sys.stdout.encoding == 'cp936':

    sys.stdout = UnicodeStreamFilter(sys.stdout)