I want to create an object (say foo) with dynamically created attributes. I can do something like this:
class Foo:
pass
foo.bar = 42
...
print(foo.bar) # 42
However, when I create the attribute, I don't know the name of the attribute yet. What I need is something like this:
def createFoo(attributeName):
foo = ???
??? = 42
...
foo = createFoo("bar")
print(foo.bar) # 42
How can I achieve this?
class Foo:
pass
foo = Foo()
setattr(foo, 'bar', 42)
print(foo.bar) # 42
Or, as I originally answered before shmee suggested setattr:
foo = Foo()
foo.__dict__['man'] = 3.14
print(foo.man) # 3.14
setattr(foo, "bar", 42) instead of manually altering the instance's __dict__
__dict__ doesn't work (at least not in Pyhton 3). setattr works fine though.__dict__ works. What problem are you seeing? Even though it works, it really shouldn't be the preferred way to get this done anyway.You could use a dictionary
then create a get function to easily access it
def createFoo(attributeName):
dict[attributeName] = 42;
def GetVal(attributeName)
return dict[attributeName];
...
foo = createFoo("bar")
print(foo.GetVal("bar")) # 42
foo = ???is creating the instance? (e.g.foo = Foo()). And the value (42), where does that come from? How come it is not also passed as an argument tocreateFoo? Isn't this question a duplicate of stackoverflow.com/questions/285061/… ?