[issue15805] Add stdout redirection tool to contextlib

[Vajrasky Kok]

Vajrasky Kok added the comment:

Nice.

My only complain is the dis.dis example. We don't have to use redirect_stdout context manager.

+        # How to capture disassembly to a string
+
+        import dis
+        import io
+
+        f = io.StringIO()
+        with redirect_stdout(f):
+            dis.dis('x**2 - y**2')
+        s = f.getvalue()


dis.dis supports file object natively. We can do this instead:
dis.dis('x**2 - y**2', file=f)

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nosy: +vajrasky

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<http://bugs.python.org/issue15805>
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