Is is possible to rewrite this code:
def function(obj):
obj.attrib = 8
return obj
So the set of the attribute and the return line appears in only one line? Something like:
def function(obj):
return obj.attrib = 8 # of course, this does not work
You could do this:
def function(obj):
return setattr(obj, 'attrib', 8) or obj
This works because built-in function setattr returns None.
setattr may be returning here, since to anyone sensible this reads as "return whatever setattr returns or fall back to obj"…
setattr function. And yes, this is a misuse of Python, a hack, and an exploit of a side-effect, but it is an answer to the given question.You don't need to return the object, the object you pass in the argument to the function will have the attrib set and you can refer it directly from the caller code.
class A:
def __init__(self, attrib):
self.attrib = attrib
def function(obj):
obj.attrib = 8
obj = A(5)
#This line prints 5
print(obj.attrib)
#5
function(obj)
#This line prints 8
print(obj.attrib)
#8
Or a better approach might be:
class A:
def __init__(self, attrib):
self.attrib = attrib
def function(self, attrib):
self.attrib = attrib
obj = A(5)
print(obj.attrib)
#5
obj.function(8)
print(obj.attrib)
#8
return from function, invalidating the intent of the question!
;soobj.attrib = 8; return objshould do that. But I guess, you are looking for a trick. I don't think there is one.