Ignore changes in the amount of whitespace
Differences between version dated 2010-08-18 01:31:39 and 2011-08-31 21:11:41
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``False`` from the resulting predicate, and conditions that can never be true
are not used for indexing or dispatching.
Another special case is tuples containing nested tuples::
>>> disjuncts( (float, (int, str)) )
[(<type 'float'>, <type 'int'>),
(<type 'float'>, <type 'str'>)]
>>> disjuncts( ((int, str), object) )
[(<type 'int'>, <type 'object'>),
(<type 'str'>, <type 'object'>)]
>>> disjuncts( (object, (int, str), float) )
[(<type 'object'>, <type 'int'>, <type 'float'>),
(<type 'object'>, <type 'str'>, <type 'float'>)]
>>> disjuncts( ((int, str), (int, str)) )
[(<type 'int'>, <type 'int'>),
(<type 'str'>, <type 'int'>),
(<type 'int'>, <type 'str'>),
(<type 'str'>, <type 'str'>)]
This lets you avoid writing lots of decorators for the cases where you want
more than one type (or ``istype()`` instance) to match in a given argument
position. (As you can see, it's equivalent to specifying all the individual
combinations of specified types.)
Finally, the ``negate()`` function inverts the truth of a condition, e.g.::
>>> negate(True)
