When the result of an expression is None, the interactive interpreter
correctly suppresses the display of the result. However, it also
suppresses the underscore assignment. I'm not sure if that is correct
or desirable because a subsequent statement has no way of knowing
whether the underscore assignment is current or whether it represents an
earlier non-None result.
Here's an example from a co-worker's regular expression experiments:
>>> import re, string
>>> re.search('lmnop', string.letters)
<_sre.SRE_Match object at 0xb6f2c480>
>>> re.search('pycon', string.letters)
>>> if _ is not None:
... print _.group()
lmnop
Raymond
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