Status: New
Owner: ----
Labels: DeprecationRemoval Priority-Medium

New issue 3919 by t.hi...@gmail.com: preview viewer='file' without a specified filename is deprecated
http://code.google.com/p/sympy/issues/detail?id=3919

The viewer='file' option to the preview function without a file name will be deprecated starting with sympy 0.7.3. You need to specify a filename with filename='name' in addition to viewer='file. In SymPy 0.7.2 preview() returned a file handle when viewer='file' was specified. This is not good practice and therefore this feature was deprecated in the course of the large cleanup in PR 1779.

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