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__pycache__	-	Open
exceptions.py	1.53 MB	View DL Edit
lazy.py	5.28 MB	View DL Edit
reference.py	3.69 MB	View DL Edit
tzfile.py	4.61 MB	View DL Edit
tzinfo.py	18.82 MB	View DL Edit
__init__.py	14.68 MB	View DL Edit

Edit file: /usr/lib/python3.9/site-packages/pytz/lazy.py

from threading import RLock
try:
    from collections.abc import Mapping as DictMixin
except ImportError:  # Python < 3.3
    try:
        from UserDict import DictMixin  # Python 2
    except ImportError:  # Python 3.0-3.3
        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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