[I accidentally sent this only to Peter, but wanted instead to send it
to the list for anyone else who happens upon it...now sending to the
list...]
On 06/22/2017 04:31 PM, Peter Otten wrote:
> If the order is linear like it seems to be the following might work:
Thanks a lot! This removes the duplication that was bothering me. To get
the error messages I wanted, I changed the code minorly as follows:
------------------------------------------
import itertools
class ConsistencyError(Exception):
pass
class InOrder:
def __init__(self):
self.indices = itertools.count(1)
self.prior_method_name = ""
def __call__(self, method):
index = next(self.indices)
prior_method_name = self.prior_method_name
method_name = method.__name__
self.prior_method_name = method_name
def wrapper(this, *args, **kw):
if index - this.state > 1:
msg = "call {}() before calling {}()".format(
prior_method_name, method_name)
raise ConsistencyError(msg)
result = method(this, *args, **kw)
this.state = index
return result
return wrapper
class C:
def __init__(self):
self.state = 0
inorder = InOrder()
@inorder
def a(self):
print("Calling a()...")
@inorder
def b(self):
print("Calling b()...")
@inorder
def c(self):
print("Calling c()...")
@inorder
def d(self):
print("Calling d()...")
------------------------------------------
Now of course I'll have to consider Steve's response and wonder _why_
exactly I'm doing this...
Cheers,
Thomas
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