Bill McClain wrote:
> I've just installed 2.6, had been using 2.4.
>
> This was working for me:
>
> #! /usr/bin/env python
> import StringIO
> out = StringIO.StringIO()
> print >> out, 'hello'
>
> I used 2to3, and added import from future to get:
>
> #! /usr/bin/env python
> from __future__ import print_function
> import io
> out = io.StringIO()
> print('hello', file=out)
>
> ...which gives an error:
>
> Traceback (most recent call last):
> File "./example.py", line 5, in <module>
> print('hello', file=out)
> File "/usr/local/lib/python2.6/io.py", line 1487, in write
> s.__class__.__name__)
> TypeError: can't write str to text stream
>
> ...which has me stumped. Why can't it?
>>> from __future__ import print_function
>>> import io
>>> out = io.StringIO()
>>> print("hello", file=out)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.6/io.py", line 1487, in write
s.__class__.__name__)
TypeError: can't write str to text stream
Seems io.StringIO() wants unicode. So let's feed it some:
>>> print(u"hello", file=out)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.6/io.py", line 1487, in write
s.__class__.__name__)
TypeError: can't write str to text stream
Still complaining? Let's have a look at the output so far:
>>> out.getvalue()
u'hello'
Hmm, u"hello" was written. The complaint must be about the newline then.
>>> out = io.StringIO()
>>> print(u"hello", file=out, end=u"\n")
>>> out.getvalue()
u'hello\n'
Heureka. Let's try something else now:
>>> print(u"hello", u"world", file=out, end=u"\n")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.6/io.py", line 1487, in write
s.__class__.__name__)
TypeError: can't write str to text stream
Fixing is left as exercise ;)
Peter
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