如何将io.stringio（）与csv模块一起使用？

Question

>>> import io
>>> import csv
>>> output = io.StringIO()
>>> output.write("Hello!")            # Fail: io.StringIO expects Unicode
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unicode argument expected, got 'str'
>>> output.write(u"Hello!")           # This works as expected.
6L
>>> writer = csv.writer(output)       # Now let's try this with the csv module:
>>> csvdata = [u"Hello", u"Goodbye"]  # Look ma, all Unicode! (?)
>>> writer.writerow(csvdata)          # Sadly, no.
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unicode argument expected, got 'str'

Answer 1

Python 2.7CSV模块不支持Unicode输入：请参阅文档开头的说明。

似乎必须将Unicode字符串编码为字节字符串，并使用io.bytesio，而不是io.stringio。

文档的示例部分包括UnicodeReader和UnicodeWriter包装类的示例（感谢@AlexeyKachayev提供的指针）。