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Suppose I define a class with a number of variables defined as
properties. Something like:

class MyClass(object):

def __init__(self):
self.some_variable = 42
self._a = None
self._b = "pi"

def get_a(self):
return self._a
def set_a(self, value):
self._a = value

def get_b(self):
return self._b
def set_b(self, value):
self._b = value

a = property(get_a, set_a, None, "a is a property")
b = property(get_b, set_b, None, "b is a property")

Is there a way to write a method that would list automatically all the
variables defined as a property (say by printing their docstring and/
or their value), and only those variables?

André

On 2007-06-25, André <> wrote:
> Suppose I define a class with a number of variables defined as
> properties. Something like:
>
> class MyClass(object):
>
> def __init__(self):
> self.some_variable = 42
> self._a = None
> self._b = "pi"
>
> def get_a(self):
> return self._a
> def set_a(self, value):
> self._a = value
>
> def get_b(self):
> return self._b
> def set_b(self, value):
> self._b = value
>
> a = property(get_a, set_a, None, "a is a property")
> b = property(get_b, set_b, None, "b is a property")
>
> Is there a way to write a method that would list automatically
> all the variables defined as a property (say by printing their
> docstring and/ or their value), and only those variables?

This is off the cuff. There's likely a better way.

for k, v in MyClass.__dict__.iteritems():
if isinstance(v, property):
print k, v.__doc__

--
Neil Cerutti
22 members were present at the church meeting held at the home of Mrs. Marsha
Crutchfield last evening. Mrs. Crutchfield and Mrs. Rankin sang a duet, The
Lord Knows Why. --Church Bulletin Blooper

Neil Cerutti wrote:
>> Is there a way to write a method that would list automatically
>> all the variables defined as a property (say by printing their
>> docstring and/ or their value), and only those variables?
>
> This is off the cuff. There's likely a better way.
>
> for k, v in MyClass.__dict__.iteritems():
> if isinstance(v, property):
> print k, v.__doc__
>

The only way I could get this to work was to change the way the properties were defined/initalized:

#!/usr/bin/python

class MyClass(object):

def __init__(self):
self.some_variable = 42
self._a = None
self._b = "pi"
self.a = property(self.get_a, self.set_a, None, "a is a property")
self.b = property(self.get_b, self.set_b, None, "b is a property")

def get_a(self):
return self._a
def set_a(self, value):
self._a = value

def get_b(self):
return self._b
def set_b(self, value):
self._b = value


test = MyClass()
for k,v in test.__dict__.iteritems():
if isinstance(v, property):
print k, v.__doc__

In <mailman.35.1182792042.22759.python->, Jay Loden wrote:

>
> Neil Cerutti wrote:
>>> Is there a way to write a method that would list automatically
>>> all the variables defined as a property (say by printing their
>>> docstring and/ or their value), and only those variables?
>>
>> This is off the cuff. There's likely a better way.
>>
>> for k, v in MyClass.__dict__.iteritems():
>> if isinstance(v, property):
>> print k, v.__doc__
>>
>
> The only way I could get this to work was to change the way the
> properties were defined/initalized:

That's because you iterate over the instance's `__dict__` and not over the
*class* `__dict__` like Neil does.

Ciao,
Marc 'BlackJack' Rintsch

En Mon, 25 Jun 2007 15:10:25 -0300, Marc 'BlackJack' Rintsch
<> escribió:

> In <mailman.35.1182792042.22759.python->, Jay Loden wrote:
>> Neil Cerutti wrote:
>>>> Is there a way to write a method that would list automatically
>>>> all the variables defined as a property (say by printing their
>>>> docstring and/ or their value), and only those variables?
>>>
>>> This is off the cuff. There's likely a better way.
>>>
>>> for k, v in MyClass.__dict__.iteritems():
>>> if isinstance(v, property):
>>> print k, v.__doc__
>>>
>>
>> The only way I could get this to work was to change the way the
>> properties were defined/initalized:
>
> That's because you iterate over the instance's `__dict__` and not over
> the
> *class* `__dict__` like Neil does.

I would iterate over dir(MyClass) instead - only because I prefer to hide
such implementation details.

--
Gabriel Genellina

On Jun 25, 2:09 pm, Neil Cerutti <horp...@yahoo.com> wrote:
> On 2007-06-25, André <andre.robe...@gmail.com> wrote:
>
>
>
> > Suppose I define a class with a number of variables defined as
> > properties. Something like:
>
> > class MyClass(object):
>
> > def __init__(self):
> > self.some_variable = 42
> > self._a = None
> > self._b = "pi"
>
> > def get_a(self):
> > return self._a
> > def set_a(self, value):
> > self._a = value
>
> > def get_b(self):
> > return self._b
> > def set_b(self, value):
> > self._b = value
>
> > a = property(get_a, set_a, None, "a is a property")
> > b = property(get_b, set_b, None, "b is a property")
>
> > Is there a way to write a method that would list automatically
> > all the variables defined as a property (say by printing their
> > docstring and/ or their value), and only those variables?
>
> This is off the cuff. There's likely a better way.
>
> for k, v in MyClass.__dict__.iteritems():
> if isinstance(v, property):
> print k, v.__doc__

Thank you, this solved my problem nicely.

André

>
> --
> Neil Cerutti
> 22 members were present at the church meeting held at the home of Mrs. Marsha
> Crutchfield last evening. Mrs. Crutchfield and Mrs. Rankin sang a duet, The
> Lord Knows Why. --Church Bulletin Blooper