I have a class like this:
class Rank (models.Model):
respect=models.IntegerField(max_length=3)
#some other attributes
Rank has many attributes (the first of which is respect).
The names of the attributes of Rank are stored in the list, attributes.
I would like to iterate through them, setting them to somevalue, an arbitrary variable.
I'm attempting:
rank=Rank()
for att in attributes:
rank.att=somevalue #I want rank.(value of att) instead of this
I think what you're trying to do is set a value to an attribute by name. This is what the setattr built in method is for.
rank=Rank()
for att in attributes:
setattr(rank, att, somevalue)
You can use the *args or **kwargs wildcard argument. Try the following to see how it works:
def foo(*args, **kwargs):
print args
print kwargs
foo(1,2,3)
foo(a=1,b=2,c=3)
foo(1,2,z=3)
You can inject attributes to objects using setattr
for att in attributes:
setattr(classobj, att.name, att.value)
Note however that this may work or not because the class could have been based on a metaclass that inspects the attributes when creating the class object.
Adding attributes or methods later may work or not, depending on what kind of magic has been used in the metaclass.
If the class wants to inspect the attributes at creation time the only solution (without messing with the class specific magic) is using eval of a string.
In general, you can't pass a name of a variable to a function - python is call by value only*
What you can do, and I think this is what you want, is use getattr and setattr:
for att in attributes:
print getattr(rank, att)
setattr(rank, att, somevalue)
* I'm aware of the sect who believe that Python has some other calling convention. It's not a thing.
rank.attto actually meanrank.{value_of_att}I think.