listing all property variables of a class instance

[=?iso-8859-1?B?QW5kcuk=?=]

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

[Neil Cerutti]

On 2007-06-25, André <an***********@gmail.comwrote:

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

[Jay Loden]

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__

[Marc 'BlackJack' Rintsch]

In <ma*************************************@python.or g>, 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

[Gabriel Genellina]

En Mon, 25 Jun 2007 15:10:25 -0300, Marc 'BlackJack' Rintsch
<bj****@gmx.netescribió:

In <ma*************************************@python.or g>, 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

[=?iso-8859-1?B?QW5kcuk=?=]

On Jun 25, 2:09 pm, Neil Cerutti <[e-mail]:

On 2007-06-25, André <[e-mail]:

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