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Edit File : lazy.py \| Size : 5.14 KB
from threading import RLock try: from UserDict import DictMixin except ImportError: from collections import Mapping as DictMixin # With lazy loading, we might end up with multiple threads triggering # it at the same time. We need a lock. _fill_lock = RLock() class LazyDict(DictMixin): """Dictionary populated on first use.""" data = None def __getitem__(self, key): if self.data is None: _fill_lock.acquire() try: if self.data is None: self._fill() finally: _fill_lock.release() return self.data[key.upper()] def __contains__(self, key): if self.data is None: _fill_lock.acquire() try: if self.data is None: self._fill() finally: _fill_lock.release() return key in self.data def __iter__(self): if self.data is None: _fill_lock.acquire() try: if self.data is None: self._fill() finally: _fill_lock.release() return iter(self.data) def __len__(self): if self.data is None: _fill_lock.acquire() try: if self.data is None: self._fill() finally: _fill_lock.release() return len(self.data) def keys(self): if self.data is None: _fill_lock.acquire() try: if self.data is None: self._fill() finally: _fill_lock.release() return self.data.keys() class LazyList(list): """List populated on first use.""" _props = [ '__str__', '__repr__', '__unicode__', '__hash__', '__sizeof__', '__cmp__', '__lt__', '__le__', '__eq__', '__ne__', '__gt__', '__ge__', 'append', 'count', 'index', 'extend', 'insert', 'pop', 'remove', 'reverse', 'sort', '__add__', '__radd__', '__iadd__', '__mul__', '__rmul__', '__imul__', '__contains__', '__len__', '__nonzero__', '__getitem__', '__setitem__', '__delitem__', '__iter__', '__reversed__', '__getslice__', '__setslice__', '__delslice__'] def __new__(cls, fill_iter=None): if fill_iter is None: return list() # We need a new class as we will be dynamically messing with its # methods. class LazyList(list): pass fill_iter = [fill_iter] def lazy(name): def _lazy(self, args, kw): _fill_lock.acquire() try: if len(fill_iter) > 0: list.extend(self, fill_iter.pop()) for method_name in cls._props: delattr(LazyList, method_name) finally: _fill_lock.release() return getattr(list, name)(self, args, *kw) return _lazy for name in cls._props: setattr(LazyList, name, lazy(name)) new_list = LazyList() return new_list # Not all versions of Python declare the same magic methods. # Filter out properties that don't exist in this version of Python # from the list. LazyList._props = [prop for prop in LazyList._props if hasattr(list, prop)] class LazySet(set): """Set populated on first use.""" _props = ( '__str__', '__repr__', '__unicode__', '__hash__', '__sizeof__', '__cmp__', '__lt__', '__le__', '__eq__', '__ne__', '__gt__', '__ge__', '__contains__', '__len__', '__nonzero__', '__getitem__', '__setitem__', '__delitem__', '__iter__', '__sub__', '__and__', '__xor__', '__or__', '__rsub__', '__rand__', '__rxor__', '__ror__', '__isub__', '__iand__', '__ixor__', '__ior__', 'add', 'clear', 'copy', 'difference', 'difference_update', 'discard', 'intersection', 'intersection_update', 'isdisjoint', 'issubset', 'issuperset', 'pop', 'remove', 'symmetric_difference', 'symmetric_difference_update', 'union', 'update') def __new__(cls, fill_iter=None): if fill_iter is None: return set() class LazySet(set): pass fill_iter = [fill_iter] def lazy(name): def _lazy(self, args, *kw): _fill_lock.acquire() try: if len(fill_iter) > 0: for i in fill_iter.pop(): set.add(self, i) for method_name in cls._props: delattr(LazySet, method_name) finally: _fill_lock.release() return getattr(set, name)(self, args, **kw) return _lazy for name in cls._props: setattr(LazySet, name, lazy(name)) new_set = LazySet() return new_set # Not all versions of Python declare the same magic methods. # Filter out properties that don't exist in this version of Python # from the list. LazySet._props = [prop for prop in LazySet._props if hasattr(set, prop)] Back

Edit File : lazy.py | Size : 5.14 KB

from threading import RLock
try:
    from UserDict import DictMixin
except ImportError:
    from collections import Mapping as DictMixin

# With lazy loading, we might end up with multiple threads triggering
# it at the same time. We need a lock.
_fill_lock = RLock()

class LazyDict(DictMixin):
    """Dictionary populated on first use."""
    data = None
    def __getitem__(self, key):
        if self.data is None:
            _fill_lock.acquire()
            try:
                if self.data is None:
                    self._fill()
            finally:
                _fill_lock.release()
        return self.data[key.upper()]

def __contains__(self, key):
        if self.data is None:
            _fill_lock.acquire()
            try:
                if self.data is None:
                    self._fill()
            finally:
                _fill_lock.release()
        return key in self.data

def __iter__(self):
        if self.data is None:
            _fill_lock.acquire()
            try:
                if self.data is None:
                    self._fill()
            finally:
                _fill_lock.release()
        return iter(self.data)

def __len__(self):
        if self.data is None:
            _fill_lock.acquire()
            try:
                if self.data is None:
                    self._fill()
            finally:
                _fill_lock.release()
        return len(self.data)

def keys(self):
        if self.data is None:
            _fill_lock.acquire()
            try:
                if self.data is None:
                    self._fill()
            finally:
                _fill_lock.release()
        return self.data.keys()

class LazyList(list):
    """List populated on first use."""

_props = [
        '__str__', '__repr__', '__unicode__',
        '__hash__', '__sizeof__', '__cmp__',
        '__lt__', '__le__', '__eq__', '__ne__', '__gt__', '__ge__',
        'append', 'count', 'index', 'extend', 'insert', 'pop', 'remove',
        'reverse', 'sort', '__add__', '__radd__', '__iadd__', '__mul__',
        '__rmul__', '__imul__', '__contains__', '__len__', '__nonzero__',
        '__getitem__', '__setitem__', '__delitem__', '__iter__',
        '__reversed__', '__getslice__', '__setslice__', '__delslice__']

def __new__(cls, fill_iter=None):

if fill_iter is None:
            return list()

# We need a new class as we will be dynamically messing with its
        # methods.
        class LazyList(list):
            pass

fill_iter = [fill_iter]

def lazy(name):
            def _lazy(self, *args, **kw):
                _fill_lock.acquire()
                try:
                    if len(fill_iter) > 0:
                        list.extend(self, fill_iter.pop())
                        for method_name in cls._props:
                            delattr(LazyList, method_name)
                finally:
                    _fill_lock.release()
                return getattr(list, name)(self, *args, **kw)
            return _lazy

for name in cls._props:
            setattr(LazyList, name, lazy(name))

new_list = LazyList()
        return new_list

# Not all versions of Python declare the same magic methods.
# Filter out properties that don't exist in this version of Python
# from the list.
LazyList._props = [prop for prop in LazyList._props if hasattr(list, prop)]

class LazySet(set):
    """Set populated on first use."""

_props = (
        '__str__', '__repr__', '__unicode__',
        '__hash__', '__sizeof__', '__cmp__',
        '__lt__', '__le__', '__eq__', '__ne__', '__gt__', '__ge__',
        '__contains__', '__len__', '__nonzero__',
        '__getitem__', '__setitem__', '__delitem__', '__iter__',
        '__sub__', '__and__', '__xor__', '__or__',
        '__rsub__', '__rand__', '__rxor__', '__ror__',
        '__isub__', '__iand__', '__ixor__', '__ior__',
        'add', 'clear', 'copy', 'difference', 'difference_update',
        'discard', 'intersection', 'intersection_update', 'isdisjoint',
        'issubset', 'issuperset', 'pop', 'remove',
        'symmetric_difference', 'symmetric_difference_update',
        'union', 'update')

def __new__(cls, fill_iter=None):

if fill_iter is None:
            return set()

class LazySet(set):
            pass

fill_iter = [fill_iter]

def lazy(name):
            def _lazy(self, *args, **kw):
                _fill_lock.acquire()
                try:
                    if len(fill_iter) > 0:
                        for i in fill_iter.pop():
                            set.add(self, i)
                        for method_name in cls._props:
                            delattr(LazySet, method_name)
                finally:
                    _fill_lock.release()
                return getattr(set, name)(self, *args, **kw)
            return _lazy

for name in cls._props:
            setattr(LazySet, name, lazy(name))

new_set = LazySet()
        return new_set

# Not all versions of Python declare the same magic methods.
# Filter out properties that don't exist in this version of Python
# from the list.
LazySet._props = [prop for prop in LazySet._props if hasattr(set, prop)]

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