# Scripts/dictionary

- `Download example`

…

## dictionary.py

    #!/usr/bin/env python
    # This is a doctest
    """
    ==============================
    Using Cocoa collection classes
    ==============================

    Cocoa contains a number of collection classes, including dictionaries and
    arrays (like python lists) in mutable and immutable variations. We'll
    demonstrate their usage using the ``NSMutableDictonary`` class.

    We'll start by importing everything we need::

        >>> from Foundation import NSMutableDictionary

    Then create an empty dictionary::

        >>> d = NSMutableDictionary.dictionary()
        >>> d
        {
        }
        >>> isinstance(d, dict)
        False
        >>> isinstance(d, NSMutableDictionary)
        True

    You can add a new value using the Objective-C API::

        >>> d.setObject_forKey_(42, 'key2')
        >>> d
        {
            key2 = 42;
        }

    But can also use the familiar python interface:

        >>> d['key1'] = 'hello'
        >>> d
        {
            key1 = hello;
            key2 = 42;
        }

    The same is true for fetching elements::

        >>> d['key2']
        42
        >>> d.objectForKey_('key1')
        'hello'
    """
    import doctest

    import __main__

    doctest.testmod(__main__, verbose=1)