I agree that it is not desirable, but that is the standard IPython behavior:
$ ipython
[...]
In [1]: import warnings
In [2]: warnings.warn('foo')
/usr/bin/ipython:1: UserWarning: foo
#!/usr/bin/python
On Monday, November 17, 2014 11:45:53 AM UTC, Jori Mantysalo wrote:
>
> Matrix(RR, [[1,2],[3,4]]).eigenvalues() gives warning message "Using
> generic algorithm for an inexact ring - -", which is of course correct.
> After that it prints "#!/usr/bin/env python".
>
> But on one occasion I already get "# -*- coding: utf-8 -*-" aftew warning
> on version 6.4.
>
> Is this reproducible everywhere, or does it depend on OS / charset /
> something?
>
> --
> Jori Mäntysalo
>
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