python - 如何将 'io.StringIO' 与 'print >>' 一起使用？

Question

我收到以下错误:

 Second line.
Traceback (most recent call last):
  File "./main.py", line 8, in <module>
    print >>output, u'Second line.'
TypeError: unicode argument expected, got 'str'

当我运行以下代码时。我不知道出了什么问题。谁能告诉我如何修复它？

#!/usr/bin/env python
# vim: set noexpandtab tabstop=2 shiftwidth=2 softtabstop=-1 fileencoding=utf-8:

import io
output = io.StringIO()
output.write(u'First line.\n')
print u'Second line.'
print >>output, u'Second line.'
contents = output.getvalue()
print contents
output.close()

Answer 1

对于 Python 2，考虑使用 StringIO模块而不是 io。

代码:

from StringIO import StringIO

测试代码:

from StringIO import StringIO
output = StringIO()
output.write(u'First line.\n')
print u'Second line.'
print >>output, u'Second line.'
contents = output.getvalue()
print contents
output.close()

结果:

Second line.
First line.
Second line.