classFoo():defwork(self, i): print("this is work~~")defrun(self): p = Pool()foriinrange(4): p.apply_async(self.work, args=(i,)) p.close() p.join()if__name__ =='__main__': foo = Foo() foo.run() 直接使用会报错 cPickle.PicklingError: Can't pickle <type 'instancem...
items()) # get args inst = class_(**args) # create new instance else: inst = d return inst P = {'B': -0.26268660809250016, 'E': -3.14e+100, 'M': -3.14e+100, 'S': -1.4652633398537678} def testPickle(): p1 = Person("Tom", 10) p1.sayHi() outFile = open("p.p", 'wb...
" " 1-byte arg INST = b'i' # build & push class instance LONG_BINGET = b'j' # push item from memo on stack; index is 4-byte arg LIST = b'l' # build list from topmost stack items EMPTY_LIST = b']' # push empty list OBJ = b'o' # build & push class instance PUT =...
importpickleclassUser:def__init__(self):self.admin=Falseself.guest=Trueu=User()print(pickle.dumps(u))# b'\x80\x03c__main__\nUser\nq\x00)\x81q\x01}q\x02(X\x05\x00\x00\x00adminq\x03\x89X\x05\x00\x00\x00guestq\x04\x88ub.'''0: \x80 PROTO 32: c GLOBAL '__main__ User...
file can be an instance of a Python class that provides the read/write methods (i.e., the expected file-like interface). This lets you map pickled streams to in-memory objects with classes, for arbitrary use. For instance, the StringIO standard library module discussed in Chapter 3 provide...
nested_instance.__class__ = nested_class return nested_instance if __name__ == '__main__': orig = ParentClass.NestedClass(var1=['hello', 'world']) pickle.dump(orig, open('simple.pickle', 'w')) pickled = pickle.load(open('simple.pickle', 'r')) print type(pickled) print ...
为了解决这个问题,pickle在序列化时,会对object id进行判断,如果这个对象已经序列化了,下次只需要存一个引用即可。 下面这段代码: class DataWithState: def __init__(self): self.state = 'state' def __getstate__(self): print('getstate called') ...
11.1. pickle ：when class instances are pickled, their class’s code and data are not pickled ...
class_ = getattr(module, class_name) args = dict((key.encode('ascii'), value) for key, value in d.items()) instance = class_(**args) else: instance = d return instance 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
如果上一步查询调度器并没有查询到对应的方法,即对象的type不在NoneType/bool/builtin/classobj/dict/float/function/instance/int/list/long/str/tuple/type/unicode这些类型中的时候,首先查看是否存在__reduce_ex__,如果存在则不再查找__reduce__,不存在的话则继续查找__reduce__;进而判断该函数返回值是string...