PyDefaultDict (Jython API documentation)
Date: 2017-06-30

org.python.modules._collections

## Class PyDefaultDict

- java.lang.Object
- - org.python.core.PyObject
  - - org.python.core.AbstractDict
    - - org.python.core.PyDictionary
      - - org.python.modules._collections.PyDefaultDict

- All Implemented Interfaces:
    Serializable, ConcurrentMap, Map, Traverseproc
  Direct Known Subclasses:
    PyDefaultDictDerived

      public class PyDefaultDict
      extends PyDictionary
      implements Traverseproc

  PyDefaultDict - This is a subclass of the builtin dict(PyDictionary) class. It supports one additional method __missing__ and adds one writable instance variable defaultFactory. The remaining functionality is the same as for the dict class. collections.defaultdict([defaultFactory[, ...]]) - returns a new dictionary-like object. The first argument provides the initial value for the defaultFactory attribute; it defaults to None. All remaining arguments are treated the same as if they were passed to the dict constructor, including keyword arguments.
  See Also:
    Serialized Form

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.python.core.PyObject

      `PyObject.ConversionException`

    - ### Nested classes/interfaces inherited from interface java.util.Map

      `Map.Entry<K,V>`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static PyType` | `TYPE`

    - ### Fields inherited from class org.python.core.PyObject

      `gcMonitorGlobal`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PyDefaultDict()`
    `PyDefaultDict(PyType subtype)`
    `PyDefaultDict(PyType subtype, Map<PyObject,PyObject> map)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `PyObject` | `__finditem__(PyObject key)` Very similar to the standard Python __getitem__ method.
    `PyObject` | `__missing__(PyObject key)`
    `PyObject` | `__reduce__()` Used for pickling.
    `PyDictionary` | `copy()` Return a shallow copy of the dictionary.
    `void` | `delDefaultFactory()`
    `PyObject` | `get(PyObject key, PyObject defaultObj)` Return this[key] if the key exists in the mapping, defaultObj is returned otherwise.
    `PyObject` | `getDefaultFactory()`
    `ConcurrentMap<PyObject,PyObject>` | `getMap()`
    `boolean` | `refersDirectlyTo(PyObject ob)` Optional operation.
    `void` | `setDefaultFactory(PyObject value)`
    `String` | `toString()`
    `int` | `traverse(Visitproc visit, Object arg)` Traverses all directly contained `PyObject`s.

    - ### Methods inherited from class org.python.core.PyDictionary

      `__cmp__, __contains__, __delitem__, __eq__, __finditem__, __iter__, __len__, __ne__, __nonzero__, __setitem__, clear, containsKey, containsValue, entrySet, equals, fromkeys, fromkeys, get, get, has_key, hashCode, isEmpty, isMappingType, isSequenceType, items, iteritems, iterkeys, itervalues, keys, keySet, merge, mergeFromKeys, mergeFromSeq, pop, pop, popitem, put, putAll, putIfAbsent, pyKeySet, remove, remove, replace, replace, setdefault, setdefault, size, update, updateCommon, values, viewitems, viewkeys, viewvalues`

    - ### Methods inherited from class org.python.core.PyObject

      `__abs__, __add__, __and__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __coerce__, __coerce_ex__, __complex__, __delattr__, __delattr__, __delete__, __delitem__, __delslice__, __delslice__, __dir__, __div__, __divmod__, __ensure_finalizer__, __findattr__, __findattr__, __findattr_ex__, __finditem__, __float__, __floordiv__, __format__, __ge__, __get__, __getattr__, __getattr__, __getitem__, __getitem__, __getnewargs__, __getslice__, __getslice__, __gt__, __hash__, __hex__, __iadd__, __iand__, __idiv__, __idivmod__, __ifloordiv__, __ilshift__, __imod__, __imul__, __index__, __int__, __invert__, __ior__, __ipow__, __irshift__, __isub__, __iternext__, __itruediv__, __ixor__, __le__, __long__, __lshift__, __lt__, __mod__, __mul__, __neg__, __not__, __oct__, __or__, __pos__, __pow__, __pow__, __radd__, __rand__, __rdiv__, __rdivmod__, __reduce_ex__, __reduce_ex__, __repr__, __rfloordiv__, __rlshift__, __rmod__, __rmul__, __ror__, __rpow__, __rrshift__, __rshift__, __rsub__, __rtruediv__, __rxor__, __set__, __setattr__, __setattr__, __setitem__, __setitem__, __setslice__, __setslice__, __str__, __sub__, __tojava__, __truediv__, __trunc__, __unicode__, __xor__, _add, _and, _callextra, _cmp, _div, _divmod, _doget, _doget, _doset, _eq, _floordiv, _ge, _gt, _iadd, _iand, _idiv, _idivmod, _ifloordiv, _ilshift, _imod, _imul, _in, _ior, _ipow, _irshift, _is, _isnot, _isub, _itruediv, _ixor, _jcall, _jcallexc, _jthrow, _le, _lshift, _lt, _mod, _mul, _ne, _notin, _or, _pow, _rshift, _sub, _truediv, _xor, asDouble, asIndex, asIndex, asInt, asInt, asIterable, asLong, asLong, asName, asName, asString, asString, asStringOrNull, asStringOrNull, bit_length, conjugate, delDict, delType, dispatch__init__, fastGetClass, fastGetDict, getDict, getType, implementsDescrDelete, implementsDescrGet, implementsDescrSet, invoke, invoke, invoke, invoke, invoke, invoke, isCallable, isDataDescr, isIndex, isInteger, isNumberType, noAttributeError, object___subclasshook__, readonlyAttributeError, setDict, setType`

    - ### Methods inherited from class java.lang.Object

      `getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface java.util.concurrent.ConcurrentMap

      `compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, replaceAll`

- - ### Field Detail

    - #### TYPE

          public static final PyType TYPE

  - ### Constructor Detail

    - #### PyDefaultDict

          public PyDefaultDict()

    - #### PyDefaultDict

          public PyDefaultDict(PyType subtype)

    - #### PyDefaultDict

          public PyDefaultDict(PyType subtype,
                               Map<PyObject,PyObject> map)

  - ### Method Detail

    - #### getMap

          public ConcurrentMap<PyObject,PyObject> getMap()

      Overrides:
        `getMap` in class `PyDictionary`

    - #### __missing__

          public PyObject __missing__(PyObject key)

    - #### __reduce__

          public PyObject __reduce__()

      Description copied from class: `PyObject`
      Used for pickling. Default implementation calls object___reduce__.
      Overrides:
        `__reduce__` in class `PyObject`
      Returns:
        a tuple of (class, tuple)

    - #### copy

          public PyDictionary copy()

      Description copied from class: `PyDictionary`
      Return a shallow copy of the dictionary.
      Overrides:
        `copy` in class `PyDictionary`

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `PyDictionary`

    - #### getDefaultFactory

          public PyObject getDefaultFactory()

    - #### setDefaultFactory

          public void setDefaultFactory(PyObject value)

    - #### delDefaultFactory

          public void delDefaultFactory()

    - #### __finditem__

          public PyObject __finditem__(PyObject key)

      Description copied from class: `PyObject`
      Very similar to the standard Python __getitem__ method. Instead of throwing a KeyError if the item isn't found, this just returns null. Classes that wish to implement __getitem__ should override this method instead (with the appropriate semantics.
      Overrides:
        `__finditem__` in class `PyDictionary`
      Parameters:
        `key` - the key to lookup in this container
      Returns:
        the value corresponding to key or null if key is not found

    - #### get

          public PyObject get(PyObject key,
                              PyObject defaultObj)

      Description copied from class: `PyDictionary`
      Return this[key] if the key exists in the mapping, defaultObj is returned otherwise.
      Overrides:
        `get` in class `PyDictionary`
      Parameters:
        `key` - the key to lookup in the dictionary.
        `defaultObj` - the value to return if the key does not exists in the mapping.

    - #### traverse

          public int traverse(Visitproc visit,
                              Object arg)

      Description copied from interface: `Traverseproc`
      Traverses all directly contained `PyObject`s. Like in CPython, `arg` must be passed unmodified to `visit` as its second parameter. If `Visitproc.visit(PyObject, Object)` returns nonzero, this return value must be returned immediately by traverse. `Visitproc.visit(PyObject, Object)` must not be called with a `null` PyObject-argument.
      Specified by:
        `traverse` in interface `Traverseproc`
      Overrides:
        `traverse` in class `PyDictionary`

    - #### refersDirectlyTo

          public boolean refersDirectlyTo(PyObject ob)

      Description copied from interface: `Traverseproc`
      Optional operation. Should only be implemented if it is more efficient than calling `Traverseproc.traverse(Visitproc, Object)` with a visitproc that just watches out for `ob`. Must return `false` if `ob` is `null`.
      Specified by:
        `refersDirectlyTo` in interface `Traverseproc`
      Overrides:
        `refersDirectlyTo` in class `PyDictionary`

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