Python unpickle a object with a class instance inside

Python unpickle a object with a class instance inside

By : KimKat
Date : November 22 2020, 10:33 AM
Does that help I believe the problem is that the HTTPAdapter class defines a __setstate__ method. This function is called upon unpickling, and restores the instance to the pickled state. However, the HTTPAdapter knows nothing of your source_address attribute, so that attribute isn't restored (or maybe not even pickled in the first place).
To fix this, you'll need to override the __setstate__ function, somewhat like this:
code :
def __setstate__(self, state):
    self.source_address= state['source_address'] # do this before calling __setstate__
    HTTPAdapter.__setstate__(self, state)

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Python object instance inheriting changes to parent class by another instance

Python object instance inheriting changes to parent class by another instance

By : Christian Fischer
Date : March 29 2020, 07:55 AM
this will help I am confused by this behaviour of Python(2.6.5), can someone shed light on why this happens? , You need to do:
code :
class A: 
     def __init__(self):
class B(A):
    def __init__(self):
How to unpickle an object whose class exists in a different namespace (python)?

How to unpickle an object whose class exists in a different namespace (python)?

By : Pritesh Ahire Patil
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I discovered a solution this. It seems the problem is executing code in a dict prevents python from figuring out where the class is defined. The solution is to create an empty module, execute the code in the module, and then add the module to sys.modules so python knows about it.
code :
script = """
class myClass:
    def __init__(self):
        self.name = 'apple'
        self.color = 'green'

import imp, sys

moduleName = 'custom'

module = imp.new_module(moduleName)

exec script in module.__dict__

sys.modules[moduleName] = module
import pickle
a = module.myClass()
s = pickle.dumps(a)
b = pickle.loads(s)
How to control what gets imported when you unpickle python object?

How to control what gets imported when you unpickle python object?

By : user3681994
Date : March 29 2020, 07:55 AM
Hope that helps What kind of control is required? As you can see from the source, when you are running pickle.loads(content) it actually does:
code :
def loads(str):
    file = StringIO(str)
    return Unpickler(file).load()
GLOBAL          = 'c'   # push self.find_class(modname, name); 2 string args
INST            = 'i'   # build & push class instance
def load(self):
    """Read a pickled object representation from the open file.
    Return the reconstituted object hierarchy specified in the file.
    read = self.read  # self.read = file.read, which is StringIO's read()
    dispatch = self.dispatch
        while 1:
            key = read(1)
            dispatch[key](self) # this function call makes a future import.
   except _Stop, stopinst:
       return stopinst.value
def find_class(self, module, name):
    # Subclasses may override this:
    __import__(module)  # straight-forward import, you can ovveride it.
    mod = sys.modules[module]
    klass = getattr(mod, name)
    return klass
def load_inst(self):
    module = self.readline()[:-1]
    name = self.readline()[:-1]
    klass = self.find_class(module, name)
    # Now module is imported and ready to be used:
    self._instantiate(klass, self.marker())
dispatch[INST] = load_inst
Get instance of class (this) in function inside instance object - typescript/angular

Get instance of class (this) in function inside instance object - typescript/angular

By : user1830835
Date : March 29 2020, 07:55 AM
seems to work fine Best way would be to replace the function(){} with the ES6 arrow functions, which holds your this context like so () => {}.
You can also use functions(){}.bind(this), but it's much better to just use arrow functions. Both will keep your reference to this as expected in the body of the function
How to unpickle a python object in Golang

How to unpickle a python object in Golang

By : balour
Date : March 29 2020, 07:55 AM
around this issue Pickle is Python specific format. AFAIK there are no pickle-parsers outside of Python. You can try to write one for Go but you will most likely only waste lots of time and mental health. On the other hand that would be an interesting project, indeed.
Anyway, instead of pickling use any language independent format, i.e. xml, json, google's protobuf or even a custom one, whatever suits your needs. Always pick tool for a job, never other way around.
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