Michael Foord <mich...@voidspace.org.uk> added the comment:
Note that I looked at making the sequence comparison code symmetric - but it
generates nice diffs for even nested containers by using prettyprint and
difflib. Switching to a symmetric output ("in first, not in second" etc) would
be very difficult without losing functionality.
Generating these diffs can be very slow though, so it may be an issue that
needs revisiting.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10573>
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