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Simpler and more complete example #161

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10 changes: 7 additions & 3 deletions docs/colls.rst
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Expand Up @@ -167,9 +167,13 @@ Dict utils

Returns a dict containing only those entries in ``mapping`` whose key is in ``keys``.

Most useful to shrink some common data or options to predefined subset. One particular case is constructing a dict of used variables::

merge(project(__builtins__, names), project(globals(), names))
d={"a":1,"b":2,"c":3}
project(d,"a")
# -> {"a":1}
project(d,("a","b"))
# -> {'a': 1, 'b': 2}
project(d,("a","x"))
# -> {"a":1}


.. function:: omit(mapping, keys)
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