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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ#!/usr/bin/env python # Copyright (c) 2009, Giampaolo Rodola'. All rights reserved. # Use of this source code is governed by a BSD-style license that can be # found in the LICENSE file. """Module which provides compatibility with older Python versions.""" __all__ = ["PY3", "int", "long", "xrange", "exec_", "callable", "namedtuple", "property", "wraps", "defaultdict", "update_wrapper", "lru_cache"] import sys try: import __builtin__ except ImportError: import builtins as __builtin__ # py3 PY3 = sys.version_info[0] == 3 if PY3: int = int long = int xrange = range unicode = str basestring = str exec_ = getattr(__builtin__, "exec") print_ = getattr(__builtin__, "print") def u(s): return s def b(s): return s.encode("latin-1") else: int = int long = long xrange = xrange unicode = unicode basestring = basestring def u(s): return unicode(s, "unicode_escape") def b(s): return s def exec_(code, globs=None, locs=None): if globs is None: frame = _sys._getframe(1) globs = frame.f_globals if locs is None: locs = frame.f_locals del frame elif locs is None: locs = globs exec("""exec code in globs, locs""") def print_(s): sys.stdout.write(s + '\n') sys.stdout.flush() # removed in 3.0, reintroduced in 3.2 try: callable = callable except NameError: def callable(obj): return any("__call__" in klass.__dict__ for klass in type(obj).__mro__) # --- stdlib additions # py 2.6 collections.namedtuple # Taken from: http://code.activestate.com/recipes/500261/ # Credits: Raymond Hettinger try: from collections import namedtuple except ImportError: from operator import itemgetter as _itemgetter from keyword import iskeyword as _iskeyword import sys as _sys def namedtuple(typename, field_names, verbose=False, rename=False): """A collections.namedtuple implementation, see: http://docs.python.org/library/collections.html#namedtuple """ if isinstance(field_names, basestring): field_names = field_names.replace(',', ' ').split() field_names = tuple(map(str, field_names)) if rename: names = list(field_names) seen = set() for i, name in enumerate(names): if ((not min(c.isalnum() or c == '_' for c in name) or _iskeyword(name) or not name or name[0].isdigit() or name.startswith('_') or name in seen)): names[i] = '_%d' % i seen.add(name) field_names = tuple(names) for name in (typename,) + field_names: if not min(c.isalnum() or c == '_' for c in name): raise ValueError('Type names and field names can only contain ' 'alphanumeric characters and underscores: %r' % name) if _iskeyword(name): raise ValueError('Type names and field names cannot be a ' 'keyword: %r' % name) if name[0].isdigit(): raise ValueError('Type names and field names cannot start ' 'with a number: %r' % name) seen_names = set() for name in field_names: if name.startswith('_') and not rename: raise ValueError( 'Field names cannot start with an underscore: %r' % name) if name in seen_names: raise ValueError('Encountered duplicate field name: %r' % name) seen_names.add(name) numfields = len(field_names) argtxt = repr(field_names).replace("'", "")[1:-1] reprtxt = ', '.join('%s=%%r' % name for name in field_names) template = '''class %(typename)s(tuple): '%(typename)s(%(argtxt)s)' \n __slots__ = () \n _fields = %(field_names)r \n def __new__(_cls, %(argtxt)s): return _tuple.__new__(_cls, (%(argtxt)s)) \n @classmethod def _make(cls, iterable, new=tuple.__new__, len=len): 'Make a new %(typename)s object from a sequence or iterable' result = new(cls, iterable) if len(result) != %(numfields)d: raise TypeError( 'Expected %(numfields)d arguments, got %%d' %% len(result)) return result \n def __repr__(self): return '%(typename)s(%(reprtxt)s)' %% self \n def _asdict(self): 'Return a new dict which maps field names to their values' return dict(zip(self._fields, self)) \n def _replace(_self, **kwds): result = _self._make(map(kwds.pop, %(field_names)r, _self)) if kwds: raise ValueError( 'Got unexpected field names: %%r' %% kwds.keys()) return result \n def __getnewargs__(self): return tuple(self) \n\n''' % locals() for i, name in enumerate(field_names): template += ' %s = _property(_itemgetter(%d))\n' % (name, i) if verbose: sys.stdout.write(template + '\n') sys.stdout.flush() namespace = dict( _itemgetter=_itemgetter, __name__='namedtuple_%s' % typename, _property=property, _tuple=tuple) try: exec_(template, namespace) except SyntaxError: e = sys.exc_info()[1] raise SyntaxError(e.message + ':\n' + template) result = namespace[typename] try: result.__module__ = _sys._getframe( 1).f_globals.get('__name__', '__main__') except (AttributeError, ValueError): pass return result # hack to support property getter/setter/deleter on python < 2.6 # http://docs.python.org/library/functions.html?highlight=property#property if hasattr(property, 'setter'): property = property else: class property(__builtin__.property): __metaclass__ = type def __init__(self, fget, *args, **kwargs): super(property, self).__init__(fget, *args, **kwargs) self.__doc__ = fget.__doc__ def getter(self, method): return property(method, self.fset, self.fdel) def setter(self, method): return property(self.fget, method, self.fdel) def deleter(self, method): return property(self.fget, self.fset, method) # py 2.5 collections.defauldict # Taken from: # http://code.activestate.com/recipes/523034-emulate-collectionsdefaultdict/ # Credits: Jason Kirtland try: from collections import defaultdict except ImportError: class defaultdict(dict): """Dict subclass that calls a factory function to supply missing values: http://docs.python.org/library/collections.html#collections.defaultdict """ def __init__(self, default_factory=None, *a, **kw): if ((default_factory is not None and not hasattr(default_factory, '__call__'))): raise TypeError('first argument must be callable') dict.__init__(self, *a, **kw) self.default_factory = default_factory def __getitem__(self, key): try: return dict.__getitem__(self, key) except KeyError: return self.__missing__(key) def __missing__(self, key): if self.default_factory is None: raise KeyError(key) self[key] = value = self.default_factory() return value def __reduce__(self): if self.default_factory is None: args = tuple() else: args = self.default_factory, return type(self), args, None, None, self.items() def copy(self): return self.__copy__() def __copy__(self): return type(self)(self.default_factory, self) def __deepcopy__(self, memo): import copy return type(self)(self.default_factory, copy.deepcopy(self.items())) def __repr__(self): return 'defaultdict(%s, %s)' % (self.default_factory, dict.__repr__(self)) # py 2.5 functools.wraps try: from functools import wraps except ImportError: def wraps(original): def inner(fn): for attribute in ['__module__', '__name__', '__doc__']: setattr(fn, attribute, getattr(original, attribute)) for attribute in ['__dict__']: if hasattr(fn, attribute): getattr(fn, attribute).update(getattr(original, attribute)) else: setattr(fn, attribute, getattr(original, attribute).copy()) return fn return inner # py 2.5 functools.update_wrapper try: from functools import update_wrapper except ImportError: WRAPPER_ASSIGNMENTS = ('__module__', '__name__', '__doc__') WRAPPER_UPDATES = ('__dict__',) def update_wrapper(wrapper, wrapped, assigned=WRAPPER_ASSIGNMENTS, updated=WRAPPER_UPDATES): """Update a wrapper function to look like the wrapped function, see: http://docs.python.org/library/functools.html#functools.update_wrapper """ for attr in assigned: setattr(wrapper, attr, getattr(wrapped, attr)) for attr in updated: getattr(wrapper, attr).update(getattr(wrapped, attr, {})) return wrapper # py 3.2 functools.lru_cache # Taken from: http://code.activestate.com/recipes/578078 # Credit: Raymond Hettinger try: from functools import lru_cache except ImportError: try: from threading import RLock except ImportError: from dummy_threading import RLock _CacheInfo = namedtuple("CacheInfo", ["hits", "misses", "maxsize", "currsize"]) class _HashedSeq(list): __slots__ = 'hashvalue' def __init__(self, tup, hash=hash): self[:] = tup self.hashvalue = hash(tup) def __hash__(self): return self.hashvalue def _make_key(args, kwds, typed, kwd_mark=(object(), ), fasttypes=set((int, str, frozenset, type(None))), sorted=sorted, tuple=tuple, type=type, len=len): key = args if kwds: sorted_items = sorted(kwds.items()) key += kwd_mark for item in sorted_items: key += item if typed: key += tuple(type(v) for v in args) if kwds: key += tuple(type(v) for k, v in sorted_items) elif len(key) == 1 and type(key[0]) in fasttypes: return key[0] return _HashedSeq(key) def lru_cache(maxsize=100, typed=False): """Least-recently-used cache decorator, see: http://docs.python.org/3/library/functools.html#functools.lru_cache """ def decorating_function(user_function): cache = dict() stats = [0, 0] HITS, MISSES = 0, 1 make_key = _make_key cache_get = cache.get _len = len lock = RLock() root = [] root[:] = [root, root, None, None] nonlocal_root = [root] PREV, NEXT, KEY, RESULT = 0, 1, 2, 3 if maxsize == 0: def wrapper(*args, **kwds): result = user_function(*args, **kwds) stats[MISSES] += 1 return result elif maxsize is None: def wrapper(*args, **kwds): key = make_key(args, kwds, typed) result = cache_get(key, root) if result is not root: stats[HITS] += 1 return result result = user_function(*args, **kwds) cache[key] = result stats[MISSES] += 1 return result else: def wrapper(*args, **kwds): if kwds or typed: key = make_key(args, kwds, typed) else: key = args lock.acquire() try: link = cache_get(key) if link is not None: root, = nonlocal_root link_prev, link_next, key, result = link link_prev[NEXT] = link_next link_next[PREV] = link_prev last = root[PREV] last[NEXT] = root[PREV] = link link[PREV] = last link[NEXT] = root stats[HITS] += 1 return result finally: lock.release() result = user_function(*args, **kwds) lock.acquire() try: root, = nonlocal_root if key in cache: pass elif _len(cache) >= maxsize: oldroot = root oldroot[KEY] = key oldroot[RESULT] = result root = nonlocal_root[0] = oldroot[NEXT] oldkey = root[KEY] root[KEY] = root[RESULT] = None del cache[oldkey] cache[key] = oldroot else: last = root[PREV] link = [last, root, key, result] last[NEXT] = root[PREV] = cache[key] = link stats[MISSES] += 1 finally: lock.release() return result def cache_info(): """Report cache statistics""" lock.acquire() try: return _CacheInfo(stats[HITS], stats[MISSES], maxsize, len(cache)) finally: lock.release() def cache_clear(): """Clear the cache and cache statistics""" lock.acquire() try: cache.clear() root = nonlocal_root[0] root[:] = [root, root, None, None] stats[:] = [0, 0] finally: lock.release() wrapper.__wrapped__ = user_function wrapper.cache_info = cache_info wrapper.cache_clear = cache_clear return update_wrapper(wrapper, user_function) return decorating_function