Traversing the properties of a Class

[EdG]

I'm using Python version 2.4 and I created a class with some properties
like:

def GetCallAmount(self):
return somedata

def GetCallCurrency(self):
return somemoredata

more....defs..etc.

CallAmount = property(GetCallAmount,None,None,None)
CallCurrency = property(GetCallCurrency, None, None, None)

more....properies..etc.

For debugging purposes, I would like to traverse the class listing out
all the properties.

 

[Neil Cerutti]

For debugging purposes, I would like to traverse the class
listing out all the properties.

This is the first thing that came to mind.

def show_properties(cls):
for attr in dir(cls):
if isinstance(getattr(cls, attr), property):
print attr

 

[Daniel Nogradi]

I'm using Python version 2.4 and I created a class with some properties

like:

def GetCallAmount(self):
return somedata

def GetCallCurrency(self):
return somemoredata

more....defs..etc.

CallAmount = property(GetCallAmount,None,None,None)
CallCurrency = property(GetCallCurrency, None, None, None)

more....properies..etc.

For debugging purposes, I would like to traverse the class listing out
all the properties.

for attr in dir( yourclass ):
if repr( yourclass.__dict__[ attr ] ).startswith( '<property' ):
print 'This looks like a property although can be something
else too: ' + attr

 

[EdG]

Thanks.

This is the first thing that came to mind.

def show_properties(cls):
for attr in dir(cls):
if isinstance(getattr(cls, attr), property):
print attr

 

[EdG]

Thanks.

I'm using Python version 2.4 and I created a class with some properties
like:

def GetCallAmount(self):
return somedata

def GetCallCurrency(self):
return somemoredata

more....defs..etc.

CallAmount = property(GetCallAmount,None,None,None)
CallCurrency = property(GetCallCurrency, None, None, None)

more....properies..etc.

For debugging purposes, I would like to traverse the class listing out
all the properties.

for attr in dir( yourclass ):
if repr( yourclass.__dict__[ attr ] ).startswith( '<property' ):
print 'This looks like a property although can be something
else too: ' + attr

 

[Bruno Desthuilliers]

EdG a écrit :

I'm using Python version 2.4 and I created a class with some properties
like:

def GetCallAmount(self):
return somedata

<mode="pep08">
The recommended naming convention is all_lower,ie:
def get_call_amount(self):
</mode>

And FWIW, there are idioms to avoid polluting the class namespace, like:

class Account(object):
@apply
def amount():
def fget(self):
return something
def fset(self, value):
do_something_with(value)
return property(**locals())

For debugging purposes, I would like to traverse the class listing out
all the properties.

cf Neil's answer.

 

[EdG]

This works great. I have one more question. Now that I have the name
of the property, how do I get it's value?

I want to print '%s = %s' % (attr,theattributesvalue)

Thanks.

 

[Bruno Desthuilliers]

EdG a écrit :
(top-post corrected)

> This works great. I have one more question. Now that I have the name
> of the property, how do I get it's value?
>
> I want to print '%s = %s' % (attr,theattributesvalue)

Then you need to have the instance...

def list_properties(cls):
return [
name for name in dir(cls)
if isinstance(getattr(cls, name), property)
]

def print_properties(obj):
for name in list_properties(obj.__class__):
print "%s : %s" % (name, str(getattr(obj, name)))

 

[EdG]

That works perfectly thank you.

EdG a écrit :
(top-post corrected)

This works great. I have one more question. Now that I have the name
of the property, how do I get it's value?

I want to print '%s = %s' % (attr,theattributesvalue)

Then you need to have the instance...

def list_properties(cls):
return [
name for name in dir(cls)
if isinstance(getattr(cls, name), property)
]

def print_properties(obj):
for name in list_properties(obj.__class__):
print "%s : %s" % (name, str(getattr(obj, name)))

 

[Steven D'Aprano]

This is the first thing that came to mind.

def show_properties(cls):
for attr in dir(cls):
if isinstance(getattr(cls, attr), property):
print attr

Funny. The first thing that came to my mind was, "Thank you for sharing.
Did you have a question?"

*wink*