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POHow to make a class that acts like a string?
 

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  1. POHow to make a class that acts like a string?
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    <p>I have a context manager that captures output to a string for a block of code indented under a <code>with</code> statement. This context manager yields a custom result object which will, when the block has finished executing, contain the captured output.</p> <pre><code>from contextlib import contextmanager @contextmanager def capturing(): "Captures output within a 'with' block." from cStringIO import StringIO class result(object): def __init__(self): self._result = None def __str__(self): return self._result try: stringio = StringIO() out, err, sys.stdout, sys.stderr = sys.stdout, sys.stderr, stringio, stringio output = result() yield output finally: output._result, sys.stdout, sys.stderr = stringio.getvalue(), out, err stringio.close() with capturing() as text: print "foo bar baz", print str(text) # prints "foo bar baz" </code></pre> <p>I can't just return a string, of course, because strings are immutable and thus the one the user gets back from the <code>with</code> statement can't be changed after their block of code runs. However, it is something of a drag to have to explicitly convert the result object to a string after the fact with <code>str</code> (I also played with making the object callable as a bit of syntactic sugar). </p> <p>So is it possible to make the result instance act like a string, in that it does in fact return a string when named? I tried implementing <code>__get__</code>, but that appears to only work on attributes. Or is what I want to do not really possible?</p>
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      1. POHow to make a class that acts like a string?
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      1. POHow to make a class that acts like a string?
      1. USHamish Grubijan
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    1. CORegardless of whether or not there is an answer to this question, I know I'd prefer you return a class that implemented `__str__`. I'm not sure how it's a drag that you have to, at some point, explicitly say, "right here is where I lock this in as a string, no further changes" by calling `str()`. So what's the gain?
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      1. POHow to make a class that acts like a string?
      1. USMike DeSimone
    2. COWhat's wrong the `stringIO`?
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      1. USS.Lott
    3. CO@Mike: Mainly that a user wants the string, not an object that has to be converted to string.
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