logo
down
shadow

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)


Share : facebook icon twitter icon
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):
         self.mylist=[] 
class B(A):
    def __init__(self):
        A.__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
    try:
        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.
Related Posts Related Posts :
  • Return new instance of subclass when using methods inherited from parent class in Python
  • Which function in django.contrib.auth creates the default model permissions?
  • Formatting text in tabular form with Python
  • How to determine the first day of a month in Python
  • Error while converting date to timestamp in python
  • Python string iterations
  • Is there any file number limitation when you select multiple files with wxFileDialog?
  • Errors with Matplotlib when making an executable with Py2exe (Python)
  • Django Haystack - Indexing single field
  • Go Pro Hero 3 - Streaming video over wifi
  • Appending a column in .csv with Python/Pandas
  • How to change my result directory in Robot framework using RIDE?
  • problem with using pandas to manipulate a big text file in python
  • python-magic module' object has no attribute 'open'
  • Where goes wrong for this High Pass Filter in Python?
  • Why inserting keys in order into a python dict is faster than doint it unordered
  • flann index saving in python
  • Create new instance of list or dictionary without class
  • How can I easily convert FORTRAN code to Python code (real code, not wrappers)
  • Address of lambda function in python
  • Python adding space between characters in string. Most efficient way
  • python http server, multiple simultaneous requests
  • Disguising username & password on distributed python scripts
  • Post GraphQL mutation with Python Requests
  • Why doesnt pandas create an excel file?
  • Rolling comparison between a value and a past window, with percentile/quantile
  • How to avoid repetitive code when defining a new type in python with signature verification
  • How to configure uWSGI in order to debug with pdb (--honour-stdin configuration issue)
  • In Python, how do you execute objects that are functions from a list?
  • Python- Variable Won't Subtract?
  • Processing Power In Python
  • Python 2.7.2 - Cannot import name _random or random from sys
  • Why doesn't the Python sorted function take keyword order instead of reverse?
  • Make a function redirect to other functions depending on a variable
  • get_absolute_url in django-categories
  • Monitoring non-Celery background task with New Relic in Python
  • Feature selection with LinearSVC
  • LSTM - Predicting the same constant values after a while
  • Test the length of elements in a list
  • Django: render radiobutton with 3 columns, cost column must change according to size & quantity selected
  • Python class attributes vs global variable
  • sys.stdout.writelines("hello") and sys.stdout.write("hello")
  • is ndarray faster than recarray access?
  • Python - search through directory trees, rename certain files
  • GAE: How to build a query where a string begins with a value
  • TypeError: __init__() takes at least 2 arguments (1 given)
  • Overriding and customizing "django.contrib.auth.views.login"
  • Django : Redirect to a particular page after login
  • Python search and copy files in directory
  • pretty printing numpy ndarrays using unicode characters
  • Frequent pattern mining in Python
  • How can I make a set of functions that can be used synchronously as well as asynchronously?
  • Convert one dice roll to two dice roll
  • count occourrence in a list
  • Writing an If condition to filter out the first word
  • to read file and compare column in python
  • Install python-numpy in the Virtualenv environment
  • `.select_by_visible_text()` is failed to select element?
  • Unable to send data multiple requests in a single connection — socket error
  • Pandas HDFStore unload dataframe from memory
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org