from __future__ import absolute_importimport csvimport codecsimport cStringIOclass Echo(object):  def write(self, value):    return valueclass UnicodeWriter:  """  A CSV writer which will write rows to CSV file "f",  which is encoded in the given encoding.  """  def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):    # Redirect output to a queue    self.queue = cStringIO.StringIO()    self.writer = csv.writer(self.queue, dialect=dialect, **kwds)    self.stream = f    self.encoder = codecs.getincrementalencoder(encoding)()  def writerow(self, row):    self.writer.writerow([handle_column(s) for s in row])    # Fetch UTF-8 output from the queue ...    data = self.queue.getvalue()    data = data.decode("utf-8")    # ... and reencode it into the target encoding    data = self.encoder.encode(data)    # write to the target stream    value = self.stream.write(data)    # empty queue    self.queue.truncate(0)    return value  def writerows(self, rows):    for row in rows:      self.writerow(row)

from django.views.generic import Viewfrom django.http.response import StreamingHttpResponseclass ExampleView(View):  headers=['一些','表頭']  def get(self,request):    result = [['第一行','數據1'],         ['第二行','數據2']]    echoer = Echo()    writer = UnicodeWriter(echoer)    def csv_itertor():        yield codecs.BOM_UTF8        yield writer.writerow(self.headers)        for column in result:          yield writer.writerow(column)    response = StreamingHttpResponse(      (row for row in csv_itertor()),      content_type="text/csv;charset=utf-8")    response['Content-Disposition'         ] = 'attachment;filename="example.csv"'    return response