On 12/22/2009 4:41 AM, Denis Doria wrote:
Hi;
I'm checking the best way to validate attributes inside a class. Of
course I can use property to check it, but I really want to do it
inside the __init__:
class A:
def __init__(self, foo, bar):
self.foo = foo #check if foo is correct
self.bar = bar
A nice sugar to do that:
import functools
class CheckError(Exception): pass
def func_check(*argcheckers):
def _checked(func):
def _function(*args):
res = [(check(arg), check, arg) for check, arg in
zip(argcheckers, args)]
if all(r[0] for r in res):
return func(*args)
else:
raise CheckError(filter(lambda x: x[0] == False, res))
return _function
return _checked
method_check = functools.partial(func_check, lambda a: True)
##########################################################
def check_foo(arg):
return 5 <= arg <= 10
def check_bar(arg):
return 10 <= arg < 20
class A(object):
@method_check(check_foo, check_bar)
def __init__(self, foo, bar):
self.foo = foo
self.bar = bar
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