What is the proper way to use **kwargs in Python when it comes to default values? kwargs returns a dictionary, but what is the best way to set default values, or is there one? Should I just access it as a dictionary? Use get function? class ExampleClass: def __init__(self, **kwargs): self.val = kwargs['val'] sel...
I'm looking for a way to decorate an arbitrary python function, so that an alternate function is called instead of the original, with all parameters passed as a list or dict. More precisely, something like this (where f is any function, and replacement_f takes a list and a dict): def replace_func(f, replacement_f): def new_f(*args,...
I come from a background in static languages. Can someone explain (hopefully through example) the real world advantages of using **kwargs over named arguments? To me it they seem to only make the function call more ambiguous. Thanks. ...
Can I pass a list of kwargs to a method for brevity? This is what i'm attempting to do: def method(**kwargs): #do something keywords = (keyword1 = 'foo', keyword2 = 'bar') method(keywords) ...
What are the uses for **kwargs in Python? I know you can do an objects.filter on a table and pass in a **kargs argument. Can I also do this for specifying time deltas i.e. timedelta(hours = time1)? How exactly does it work? Is it classes as 'unpacking'? Like a,b=1,2? ...
If I have a python function like so: def some_func(arg1, arg2, arg3=1, arg4=2): Is there a way to determine which arguments were passed by keyword from inside the function? EDIT For those asking why I need this, I have no real reason, it came up in a conversation and curiosity got the better of me. ...
Hello everyone, I have an odd problem. I know that in Python, kwargs follow args, so I checked for that and it's not the problem. What is the problem is this: Fine: def __init__(self, sample_rate, label=u"", data=[] ): TypeError: __init__() got multiple values for keyword argument 'data': def __init__(self, sample_rate, data=[], l...
Anyone know if it is easily possible to send **kwargs over PyAMF from NetConnection.call()? I would like it. I could write a wrapper around the actual function and expose that and perform some parsing manually to determine the kwargs to pass in, but I don't want to do that. I will just use a normal argument list in that case. ...
Need to create a class that will do all things as the "merge" function. In class i will change, process and add new arguments. def merge(*arg, **kwarg): # get decorator args & kwargs def func(f): def tmp(*args, **kwargs): # get function args & kwargs kwargs.update(kwarg) # merge two dictionaries r...
The urlconf and view is as follows: url(r'^register/$', register, { 'backend': 'registration.backends.default.DefaultBackend' }, name='registration_register'), def register(request, backend, success_url=None, form_class=None, ...
Why when I call a function like this : function(request, **form.cleaned_data) I can send form's data as a dictionary, but when I try doing like this : data = **form.cleaned_data I'm getting error ? ...
So I have difficulty with the concept of *args and **kwargs. So far I have learned that: *args = list of arguments -as positional arguments **kwargs = dictionary - whose keys become separate keyword arguments and the values become values of these arguments. ?? To be honest I don't understand and don't get for what programming task ...
You can create a new model in App Engine using a dictionary: my_model = MyModel.get_or_insert(keyname, **kwargs) Is there a way to update a model using a dictionary instead of doing the following? my_model.firstprop = 'first' my_model.secondprop = 'second' ...
I am using Django's pre_save signal to implement auto_now_add. There is a lot of discussion on the internet on why you should or shouldn't implement it yourself. I do not appreciate comments on this. Neither on whether I should be rewriting the save function (I have a lot of models that use auto_now_add so using signals makes sense). My...
What Django Does Django's Model Field "blank" attribute, and the way it gets negated and turned into the Form Field "required" attribute when you create a ModelForm, is pretty cool. It allows me to set the property on the model where it belongs, but have the "required" attribute available when handling a ModelForm created from it. Havin...
I was trying to pass an additional parameter to my form, which is anObject to ForeignKey relation. But dunno why form returns __init__() got an unexpected keyword argument 'parent' when I'm pretty sure that it is possible to send additional parameters to form's __init__ (ie here : http://stackoverflow.com/questions/3182262/simple-form-no...