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Issue 2917: Merge the pickle and cPickle module.
This commit is contained in:
Alexandre Vassalotti
parent
1e637b7373
commit
cc313061a5
157
Lib/pickle.py
157
Lib/pickle.py
@ -174,7 +174,7 @@ __all__.extend([x for x in dir() if re.match("[A-Z][A-Z0-9_]+$",x)])
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# Pickling machinery
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class Pickler:
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class _Pickler:
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def __init__(self, file, protocol=None):
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"""This takes a binary file for writing a pickle data stream.
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@ -182,21 +182,19 @@ class Pickler:
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All protocols now read and write bytes.
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The optional protocol argument tells the pickler to use the
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given protocol; supported protocols are 0, 1, 2. The default
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protocol is 2; it's been supported for many years now.
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Protocol 1 is more efficient than protocol 0; protocol 2 is
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more efficient than protocol 1.
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given protocol; supported protocols are 0, 1, 2, 3. The default
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protocol is 3; a backward-incompatible protocol designed for
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Python 3.0.
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Specifying a negative protocol version selects the highest
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protocol version supported. The higher the protocol used, the
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more recent the version of Python needed to read the pickle
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produced.
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The file parameter must have a write() method that accepts a single
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string argument. It can thus be an open file object, a StringIO
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object, or any other custom object that meets this interface.
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The file argument must have a write() method that accepts a single
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bytes argument. It can thus be a file object opened for binary
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writing, a io.BytesIO instance, or any other custom object that
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meets this interface.
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"""
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if protocol is None:
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protocol = DEFAULT_PROTOCOL
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@ -204,7 +202,10 @@ class Pickler:
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protocol = HIGHEST_PROTOCOL
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elif not 0 <= protocol <= HIGHEST_PROTOCOL:
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raise ValueError("pickle protocol must be <= %d" % HIGHEST_PROTOCOL)
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self.write = file.write
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try:
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self.write = file.write
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except AttributeError:
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raise TypeError("file must have a 'write' attribute")
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self.memo = {}
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self.proto = int(protocol)
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self.bin = protocol >= 1
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@ -270,10 +271,10 @@ class Pickler:
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return GET + repr(i).encode("ascii") + b'\n'
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def save(self, obj):
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def save(self, obj, save_persistent_id=True):
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# Check for persistent id (defined by a subclass)
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pid = self.persistent_id(obj)
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if pid:
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if pid is not None and save_persistent_id:
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self.save_pers(pid)
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return
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@ -341,7 +342,7 @@ class Pickler:
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def save_pers(self, pid):
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# Save a persistent id reference
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if self.bin:
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self.save(pid)
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self.save(pid, save_persistent_id=False)
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self.write(BINPERSID)
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else:
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self.write(PERSID + str(pid).encode("ascii") + b'\n')
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@ -350,13 +351,13 @@ class Pickler:
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listitems=None, dictitems=None, obj=None):
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# This API is called by some subclasses
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# Assert that args is a tuple or None
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# Assert that args is a tuple
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if not isinstance(args, tuple):
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raise PicklingError("args from reduce() should be a tuple")
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raise PicklingError("args from save_reduce() should be a tuple")
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# Assert that func is callable
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if not hasattr(func, '__call__'):
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raise PicklingError("func from reduce should be callable")
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raise PicklingError("func from save_reduce() should be callable")
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save = self.save
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write = self.write
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@ -438,31 +439,6 @@ class Pickler:
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self.write(obj and TRUE or FALSE)
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dispatch[bool] = save_bool
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def save_int(self, obj, pack=struct.pack):
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if self.bin:
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# If the int is small enough to fit in a signed 4-byte 2's-comp
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# format, we can store it more efficiently than the general
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# case.
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# First one- and two-byte unsigned ints:
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if obj >= 0:
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if obj <= 0xff:
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self.write(BININT1 + bytes([obj]))
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return
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if obj <= 0xffff:
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self.write(BININT2 + bytes([obj&0xff, obj>>8]))
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return
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# Next check for 4-byte signed ints:
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high_bits = obj >> 31 # note that Python shift sign-extends
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if high_bits == 0 or high_bits == -1:
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# All high bits are copies of bit 2**31, so the value
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# fits in a 4-byte signed int.
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self.write(BININT + pack("<i", obj))
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return
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# Text pickle, or int too big to fit in signed 4-byte format.
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self.write(INT + repr(obj).encode("ascii") + b'\n')
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# XXX save_int is merged into save_long
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# dispatch[int] = save_int
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def save_long(self, obj, pack=struct.pack):
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if self.bin:
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# If the int is small enough to fit in a signed 4-byte 2's-comp
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@ -503,7 +479,7 @@ class Pickler:
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def save_bytes(self, obj, pack=struct.pack):
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if self.proto < 3:
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self.save_reduce(bytes, (list(obj),))
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self.save_reduce(bytes, (list(obj),), obj=obj)
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return
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n = len(obj)
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if n < 256:
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@ -579,12 +555,6 @@ class Pickler:
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dispatch[tuple] = save_tuple
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# save_empty_tuple() isn't used by anything in Python 2.3. However, I
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# found a Pickler subclass in Zope3 that calls it, so it's not harmless
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# to remove it.
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def save_empty_tuple(self, obj):
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self.write(EMPTY_TUPLE)
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def save_list(self, obj):
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write = self.write
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@ -696,7 +666,7 @@ class Pickler:
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module = whichmodule(obj, name)
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try:
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__import__(module)
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__import__(module, level=0)
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mod = sys.modules[module]
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klass = getattr(mod, name)
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except (ImportError, KeyError, AttributeError):
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@ -720,9 +690,19 @@ class Pickler:
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else:
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write(EXT4 + pack("<i", code))
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return
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# Non-ASCII identifiers are supported only with protocols >= 3.
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if self.proto >= 3:
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write(GLOBAL + bytes(module, "utf-8") + b'\n' +
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bytes(name, "utf-8") + b'\n')
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else:
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try:
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write(GLOBAL + bytes(module, "ascii") + b'\n' +
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bytes(name, "ascii") + b'\n')
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except UnicodeEncodeError:
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raise PicklingError(
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"can't pickle global identifier '%s.%s' using "
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"pickle protocol %i" % (module, name, self.proto))
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write(GLOBAL + bytes(module, "utf-8") + b'\n' +
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bytes(name, "utf-8") + b'\n')
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self.memoize(obj)
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dispatch[FunctionType] = save_global
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@ -781,7 +761,7 @@ def whichmodule(func, funcname):
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# Unpickling machinery
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class Unpickler:
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class _Unpickler:
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def __init__(self, file, *, encoding="ASCII", errors="strict"):
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"""This takes a binary file for reading a pickle data stream.
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@ -841,6 +821,9 @@ class Unpickler:
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while stack[k] is not mark: k = k-1
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return k
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def persistent_load(self, pid):
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raise UnpickingError("unsupported persistent id encountered")
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dispatch = {}
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def load_proto(self):
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@ -850,7 +833,7 @@ class Unpickler:
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dispatch[PROTO[0]] = load_proto
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def load_persid(self):
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pid = self.readline()[:-1]
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pid = self.readline()[:-1].decode("ascii")
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self.append(self.persistent_load(pid))
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dispatch[PERSID[0]] = load_persid
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@ -879,9 +862,9 @@ class Unpickler:
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val = True
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else:
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try:
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val = int(data)
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val = int(data, 0)
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except ValueError:
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val = int(data)
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val = int(data, 0)
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self.append(val)
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dispatch[INT[0]] = load_int
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@ -933,7 +916,8 @@ class Unpickler:
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break
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else:
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raise ValueError("insecure string pickle: %r" % orig)
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self.append(codecs.escape_decode(rep)[0])
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self.append(codecs.escape_decode(rep)[0]
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.decode(self.encoding, self.errors))
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dispatch[STRING[0]] = load_string
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def load_binstring(self):
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@ -975,7 +959,7 @@ class Unpickler:
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dispatch[TUPLE[0]] = load_tuple
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def load_empty_tuple(self):
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self.stack.append(())
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self.append(())
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dispatch[EMPTY_TUPLE[0]] = load_empty_tuple
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def load_tuple1(self):
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@ -991,11 +975,11 @@ class Unpickler:
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dispatch[TUPLE3[0]] = load_tuple3
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def load_empty_list(self):
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self.stack.append([])
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self.append([])
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dispatch[EMPTY_LIST[0]] = load_empty_list
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def load_empty_dictionary(self):
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self.stack.append({})
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self.append({})
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dispatch[EMPTY_DICT[0]] = load_empty_dictionary
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def load_list(self):
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@ -1022,13 +1006,13 @@ class Unpickler:
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def _instantiate(self, klass, k):
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args = tuple(self.stack[k+1:])
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del self.stack[k:]
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instantiated = 0
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instantiated = False
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if (not args and
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isinstance(klass, type) and
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not hasattr(klass, "__getinitargs__")):
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value = _EmptyClass()
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value.__class__ = klass
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instantiated = 1
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instantiated = True
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if not instantiated:
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try:
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value = klass(*args)
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@ -1038,8 +1022,8 @@ class Unpickler:
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self.append(value)
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def load_inst(self):
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module = self.readline()[:-1]
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name = self.readline()[:-1]
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module = self.readline()[:-1].decode("ascii")
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name = self.readline()[:-1].decode("ascii")
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klass = self.find_class(module, name)
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self._instantiate(klass, self.marker())
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dispatch[INST[0]] = load_inst
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@ -1059,8 +1043,8 @@ class Unpickler:
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dispatch[NEWOBJ[0]] = load_newobj
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def load_global(self):
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module = self.readline()[:-1]
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name = self.readline()[:-1]
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module = self.readline()[:-1].decode("utf-8")
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name = self.readline()[:-1].decode("utf-8")
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klass = self.find_class(module, name)
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self.append(klass)
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dispatch[GLOBAL[0]] = load_global
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@ -1095,11 +1079,7 @@ class Unpickler:
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def find_class(self, module, name):
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# Subclasses may override this
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if isinstance(module, bytes_types):
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module = module.decode("utf-8")
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if isinstance(name, bytes_types):
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name = name.decode("utf-8")
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__import__(module)
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__import__(module, level=0)
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mod = sys.modules[module]
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klass = getattr(mod, name)
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return klass
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@ -1131,31 +1111,33 @@ class Unpickler:
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dispatch[DUP[0]] = load_dup
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def load_get(self):
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self.append(self.memo[self.readline()[:-1].decode("ascii")])
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i = int(self.readline()[:-1])
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self.append(self.memo[i])
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dispatch[GET[0]] = load_get
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def load_binget(self):
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i = ord(self.read(1))
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self.append(self.memo[repr(i)])
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i = self.read(1)[0]
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self.append(self.memo[i])
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dispatch[BINGET[0]] = load_binget
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def load_long_binget(self):
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i = mloads(b'i' + self.read(4))
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self.append(self.memo[repr(i)])
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self.append(self.memo[i])
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dispatch[LONG_BINGET[0]] = load_long_binget
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def load_put(self):
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self.memo[self.readline()[:-1].decode("ascii")] = self.stack[-1]
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i = int(self.readline()[:-1])
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self.memo[i] = self.stack[-1]
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dispatch[PUT[0]] = load_put
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def load_binput(self):
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i = ord(self.read(1))
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self.memo[repr(i)] = self.stack[-1]
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i = self.read(1)[0]
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self.memo[i] = self.stack[-1]
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dispatch[BINPUT[0]] = load_binput
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def load_long_binput(self):
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i = mloads(b'i' + self.read(4))
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self.memo[repr(i)] = self.stack[-1]
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self.memo[i] = self.stack[-1]
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dispatch[LONG_BINPUT[0]] = load_long_binput
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def load_append(self):
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@ -1321,6 +1303,15 @@ def decode_long(data):
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n -= 1 << (nbytes * 8)
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return n
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# Use the faster _pickle if possible
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try:
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from _pickle import *
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except ImportError:
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Pickler, Unpickler = _Pickler, _Unpickler
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PickleError = _PickleError
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PicklingError = _PicklingError
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UnpicklingError = _UnpicklingError
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# Shorthands
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def dump(obj, file, protocol=None):
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@ -1333,14 +1324,14 @@ def dumps(obj, protocol=None):
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assert isinstance(res, bytes_types)
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return res
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def load(file):
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return Unpickler(file).load()
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def load(file, *, encoding="ASCII", errors="strict"):
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return Unpickler(file, encoding=encoding, errors=errors).load()
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def loads(s):
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def loads(s, *, encoding="ASCII", errors="strict"):
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if isinstance(s, str):
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raise TypeError("Can't load pickle from unicode string")
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file = io.BytesIO(s)
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return Unpickler(file).load()
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return Unpickler(file, encoding=encoding, errors=errors).load()
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# Doctest
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@ -2079,11 +2079,12 @@ _dis_test = r"""
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70: t TUPLE (MARK at 49)
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71: p PUT 5
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74: R REDUCE
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75: V UNICODE 'def'
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80: p PUT 6
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83: s SETITEM
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84: a APPEND
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85: . STOP
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75: p PUT 6
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78: V UNICODE 'def'
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83: p PUT 7
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86: s SETITEM
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87: a APPEND
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88: . STOP
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highest protocol among opcodes = 0
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Try again with a "binary" pickle.
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@ -2115,11 +2116,12 @@ Try again with a "binary" pickle.
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49: t TUPLE (MARK at 37)
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50: q BINPUT 5
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52: R REDUCE
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53: X BINUNICODE 'def'
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61: q BINPUT 6
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63: s SETITEM
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64: e APPENDS (MARK at 3)
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65: . STOP
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53: q BINPUT 6
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55: X BINUNICODE 'def'
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63: q BINPUT 7
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65: s SETITEM
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66: e APPENDS (MARK at 3)
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67: . STOP
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highest protocol among opcodes = 1
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Exercise the INST/OBJ/BUILD family.
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@ -362,7 +362,7 @@ def create_data():
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return x
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class AbstractPickleTests(unittest.TestCase):
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# Subclass must define self.dumps, self.loads, self.error.
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# Subclass must define self.dumps, self.loads.
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_testdata = create_data()
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@ -463,8 +463,9 @@ class AbstractPickleTests(unittest.TestCase):
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self.assertEqual(list(x[0].attr.keys()), [1])
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self.assert_(x[0].attr[1] is x)
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def test_garyp(self):
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self.assertRaises(self.error, self.loads, b'garyp')
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def test_get(self):
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self.assertRaises(KeyError, self.loads, b'g0\np0')
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self.assertEquals(self.loads(b'((Kdtp0\nh\x00l.))'), [(100,), (100,)])
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def test_insecure_strings(self):
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# XXX Some of these tests are temporarily disabled
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@ -955,7 +956,7 @@ class AbstractPickleModuleTests(unittest.TestCase):
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f = open(TESTFN, "wb")
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try:
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f.close()
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self.assertRaises(ValueError, self.module.dump, 123, f)
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self.assertRaises(ValueError, pickle.dump, 123, f)
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finally:
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os.remove(TESTFN)
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@ -964,24 +965,24 @@ class AbstractPickleModuleTests(unittest.TestCase):
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f = open(TESTFN, "wb")
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try:
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f.close()
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self.assertRaises(ValueError, self.module.dump, 123, f)
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self.assertRaises(ValueError, pickle.dump, 123, f)
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finally:
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os.remove(TESTFN)
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def test_highest_protocol(self):
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# Of course this needs to be changed when HIGHEST_PROTOCOL changes.
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self.assertEqual(self.module.HIGHEST_PROTOCOL, 3)
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self.assertEqual(pickle.HIGHEST_PROTOCOL, 3)
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def test_callapi(self):
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from io import BytesIO
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f = BytesIO()
|
||||
# With and without keyword arguments
|
||||
self.module.dump(123, f, -1)
|
||||
self.module.dump(123, file=f, protocol=-1)
|
||||
self.module.dumps(123, -1)
|
||||
self.module.dumps(123, protocol=-1)
|
||||
self.module.Pickler(f, -1)
|
||||
self.module.Pickler(f, protocol=-1)
|
||||
pickle.dump(123, f, -1)
|
||||
pickle.dump(123, file=f, protocol=-1)
|
||||
pickle.dumps(123, -1)
|
||||
pickle.dumps(123, protocol=-1)
|
||||
pickle.Pickler(f, -1)
|
||||
pickle.Pickler(f, protocol=-1)
|
||||
|
||||
class AbstractPersistentPicklerTests(unittest.TestCase):
|
||||
|
||||
|
||||
@ -7,37 +7,42 @@ from test.pickletester import AbstractPickleTests
|
||||
from test.pickletester import AbstractPickleModuleTests
|
||||
from test.pickletester import AbstractPersistentPicklerTests
|
||||
|
||||
class PickleTests(AbstractPickleTests, AbstractPickleModuleTests):
|
||||
try:
|
||||
import _pickle
|
||||
has_c_implementation = True
|
||||
except ImportError:
|
||||
has_c_implementation = False
|
||||
|
||||
module = pickle
|
||||
error = KeyError
|
||||
|
||||
def dumps(self, arg, proto=None):
|
||||
return pickle.dumps(arg, proto)
|
||||
class PickleTests(AbstractPickleModuleTests):
|
||||
pass
|
||||
|
||||
def loads(self, buf):
|
||||
return pickle.loads(buf)
|
||||
|
||||
class PicklerTests(AbstractPickleTests):
|
||||
class PyPicklerTests(AbstractPickleTests):
|
||||
|
||||
error = KeyError
|
||||
pickler = pickle._Pickler
|
||||
unpickler = pickle._Unpickler
|
||||
|
||||
def dumps(self, arg, proto=None):
|
||||
f = io.BytesIO()
|
||||
p = pickle.Pickler(f, proto)
|
||||
p = self.pickler(f, proto)
|
||||
p.dump(arg)
|
||||
f.seek(0)
|
||||
return bytes(f.read())
|
||||
|
||||
def loads(self, buf):
|
||||
f = io.BytesIO(buf)
|
||||
u = pickle.Unpickler(f)
|
||||
u = self.unpickler(f)
|
||||
return u.load()
|
||||
|
||||
class PersPicklerTests(AbstractPersistentPicklerTests):
|
||||
|
||||
class PyPersPicklerTests(AbstractPersistentPicklerTests):
|
||||
|
||||
pickler = pickle._Pickler
|
||||
unpickler = pickle._Unpickler
|
||||
|
||||
def dumps(self, arg, proto=None):
|
||||
class PersPickler(pickle.Pickler):
|
||||
class PersPickler(self.pickler):
|
||||
def persistent_id(subself, obj):
|
||||
return self.persistent_id(obj)
|
||||
f = io.BytesIO()
|
||||
@ -47,19 +52,29 @@ class PersPicklerTests(AbstractPersistentPicklerTests):
|
||||
return f.read()
|
||||
|
||||
def loads(self, buf):
|
||||
class PersUnpickler(pickle.Unpickler):
|
||||
class PersUnpickler(self.unpickler):
|
||||
def persistent_load(subself, obj):
|
||||
return self.persistent_load(obj)
|
||||
f = io.BytesIO(buf)
|
||||
u = PersUnpickler(f)
|
||||
return u.load()
|
||||
|
||||
|
||||
if has_c_implementation:
|
||||
class CPicklerTests(PyPicklerTests):
|
||||
pickler = _pickle.Pickler
|
||||
unpickler = _pickle.Unpickler
|
||||
|
||||
class CPersPicklerTests(PyPersPicklerTests):
|
||||
pickler = _pickle.Pickler
|
||||
unpickler = _pickle.Unpickler
|
||||
|
||||
|
||||
def test_main():
|
||||
support.run_unittest(
|
||||
PickleTests,
|
||||
PicklerTests,
|
||||
PersPicklerTests
|
||||
)
|
||||
tests = [PickleTests, PyPicklerTests, PyPersPicklerTests]
|
||||
if has_c_implementation:
|
||||
tests.extend([CPicklerTests, CPersPicklerTests])
|
||||
support.run_unittest(*tests)
|
||||
support.run_doctest(pickle)
|
||||
|
||||
if __name__ == "__main__":
|
||||
|
||||
@ -12,8 +12,6 @@ class OptimizedPickleTests(AbstractPickleTests, AbstractPickleModuleTests):
|
||||
def loads(self, buf):
|
||||
return pickle.loads(buf)
|
||||
|
||||
module = pickle
|
||||
error = KeyError
|
||||
|
||||
def test_main():
|
||||
support.run_unittest(OptimizedPickleTests)
|
||||
|
||||
@ -78,6 +78,10 @@ Extension Modules
|
||||
Library
|
||||
-------
|
||||
|
||||
- The ``pickle`` module is now automatically use an optimized C
|
||||
implementation of Pickler and Unpickler when available. The
|
||||
``cPickle`` module is no longer needed.
|
||||
|
||||
- Removed the ``htmllib`` and ``sgmllib`` modules.
|
||||
|
||||
- The deprecated ``SmartCookie`` and ``SimpleCookie`` classes have
|
||||
|
||||
4546
Modules/_pickle.c
Normal file
4546
Modules/_pickle.c
Normal file
File diff suppressed because it is too large
Load Diff
2
setup.py
2
setup.py
@ -422,6 +422,8 @@ class PyBuildExt(build_ext):
|
||||
exts.append( Extension("_functools", ["_functoolsmodule.c"]) )
|
||||
# Memory-based IO accelerator modules
|
||||
exts.append( Extension("_bytesio", ["_bytesio.c"]) )
|
||||
# C-optimized pickle replacement
|
||||
exts.append( Extension("_pickle", ["_pickle.c"]) )
|
||||
# atexit
|
||||
exts.append( Extension("atexit", ["atexitmodule.c"]) )
|
||||
# _json speedups
|
||||
|
||||
Loading…
Reference in New Issue
Block a user