fields['key'] = 'value'
class foo(object):
var1 = 'bar'
def foobar(self):
pass
class
-
var1 = 'bar'
locals()['var1'] = 'bar'
-
def foobar
locals()['var'] = the result of compiling the function
-
locals()
__new__
type
-
foo
A.fields
A
Meta
fields
super().fields
B
super(B).fields
def MakeFields(**fields):
return fields
class Meta(type):
def __new__(mcs, name, bases, attr):
for base in bases:
if hasattr(base, 'fields'):
inherited = getattr(base, 'fields')
try:
attr['fields'].update(inherited)
except KeyError:
attr['fields'] = inherited
except ValueError:
pass
return type.__new__(mcs, name, bases, attr)
class A(metaclass=Meta):
fields = MakeFields(id='int',name='varchar')
class B(A):
fields = MakeFields(count='int')
class C(B):
pass
class Test(object):
fields = "asd"
class D(C, Test):
pass
print C.fields
print D.fields