Exclude object's field from pickling in python

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I would like to avoid pickling of certain fields in an instance of a class. Currently, before pickling I just set those fields to None, but I wonder whether there's more elegant solution?

There is an example in the docs which solves your problem with __getstate__ and __setstate__.

QuerySet API reference | Django documentation, Entry.objects.exclude(pub_date__gt=datetime.date(2005, 1, 3), Annotates each object in the QuerySet with the provided list of query expressions. Set the fields you want skipped to Read Only in the Object tab under Value >> Type and go to your XML Source tab. On the XML Source tab, hit ctrl + H to open up a find and replace window, find readOnly and replace it with protected. The fields will then be completely skipped in the tab order.

One way to handle instance attributes that are not picklable objects is to use the special methods available for modifying a class instance's state: __getstate__() and __setstate__(). Here is an example

class Foo(object):

    def __init__(self, value, filename):
        self.value = value
        self.logfile = file(filename, 'w')

    def __getstate__(self):
        """Return state values to be pickled."""
        f = self.logfile
        return (self.value, f.name, f.tell())

    def __setstate__(self, state):
        """Restore state from the unpickled state values."""
        self.value, name, position = state
        f = file(name, 'w')
        f.seek(position)
        self.logfile = f

When an instance of Foo is pickled, Python will pickle only the values returned to it when it calls the instance's __getstate__() method. Likewise, during unpickling, Python will supply the unpickled values as an argument to the instance's __setstate__() method. Inside the __setstate__() method we are able to recreate the file object based on the name and position information we pickled, and assign the file object to the instance's logfile attribute.

Reference: http://www.ibm.com/developerworks/library/l-pypers.html

Exclude objects using filters - SQL Source Control 5, You can create filters to exclude objects from SQL Source Control. When you exclude an object with a filter, it isn't shown on the Commit tab,  Sadly, as of now sqlpackage.exe utility does not have any option of excluding a specific object. However, it does have options to exclude an entire object type.

Pickling uses the object's __getstate__ and __setstate__ methods; you can override them and ignore the fields you want.

# foo.py
class Foo:
    def __init__(self):
        self.bar = 1
        self.baz = 2

    def __getstate__(self):
        state = self.__dict__.copy()
        # Don't pickle baz
        del state["baz"]
        return state

    def __setstate__(self, state):
        self.__dict__.update(state)
        # Add baz back since it doesn't exist in the pickle
        self.baz = 0
# main.py
import pickle

from foo import Foo


foo = Foo()
print(f"Foo bar: {foo.bar} baz: {foo.baz}")

new_foo = pickle.loads(pickle.dumps(foo))
print(f"New bar: {new_foo.bar} baz: {new_foo.baz}")

Output:

Foo bar: 1 baz: 2
New bar: 1 baz: 0

You can find another example here: https://docs.python.org/3/library/pickle.html#handling-stateful-objects

Django object multiple exclude(), Based on your reply to Ned, it sounds like you just want to exclude a list of tags. So you could just use the in filter: names_to_exclude = [o.name  Other light sources will also illuminate the cube and other objects. The selected light source should illuminate only the cube and not affect other ob… Blender Artists is an online creative forum that is dedicated to the growth and education of the 3D software Blender.

Exclude/Include Dialog | 3ds Max 2019, The object still appears lit in shaded viewports. Exclusion takes effect only when you render the scene. To include objects that were excluded:. When you use Select-Object, its -ExcludeProperty parameter does not seem to do anything. The truth is: -ExcludeProperty only works when you also use -Property. So this works: Get-Service|Select-Object-ExcludePropertyName-PropertyStatus,DisplayName,Name.

Utility Types · TypeScript, Constructs a type by excluding from T all properties that are assignable to U . In the example above, the methods object in the argument to makeObject has a  Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more Make sure you correctly excluded object type variables in your second call of .describe()

Excluding objects from continuous integration, Excluding object types; Excluding individual objects. Save the repository.config file. Run complete serialization for all objects to bring your  Hi All, first post here, so please excuse my lack of knowledge. I’m building a scene for a commercial project in 2.8, somewhat risky as I’ve never used Blender before, but so far, on the whole, I’m loving Blender (came from Modo). One thing I’d really like to achieve is to add lights that affect only certain objects, and therefore, excluding other objects. Now, after searching google

Comments
  • Fastest Fingers First :P
  • fixed the link again
  • The other answer used state as a tuple, whereas this one used it as a dictionary. It seems that state's type is determined by __getstate__'s return type