The PEAK Developers' Center   Diff for "PEAK-Rules/Criteria" UserPreferences
HelpContents Search Diffs Info Edit Subscribe XML Print View Up
Ignore changes in the amount of whitespace

Differences between version dated 2010-08-18 01:31:39 and 2011-08-31 21:11:41

Deletions are marked like this.
Additions are marked like this.

``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)

ShowText of this page
EditText of this page
FindPage by browsing, title search , text search or an index
Or try one of these actions: AttachFile, DeletePage, LikePages, LocalSiteMap, SpellCheck