Prashant Saxena wrote:
import sys
class Float(float):
"""
Custom float datatype with addtional attributes.
"""
def __new__(self,
value=0.0, #default value
name='', # string
& nbsp; range=(0.0, 1.0) # tuple
)
try:
self.name = name
self.range = range
self.pos = (1, 1)
return float.__new__(self, value)
except:
print ('Invalid value : Float = %s %s' % (str(value),
sys.exc_info()[:2]))
def setpos(self, value):
self.pos = value
def getpos(self):
return self.pos*2.0
p = property(getpos, setpos)
myFloat = Float(0.23)
print myFloat.pos
I am trying to create a custom 'float' datatype by subtyping default
'float'. There are few things I would like to know here:
1. How to make 'name' & 'range' only readable attributes.
A property with a working get and set that raises an exception.
2. The property 'p' is not working as it has to. What's wrong here?
Don't know.
3. I would be heavily instancing this class, and I won't be creating any
new attribute on instance. Is there any way to optimize? __slots__?
I believe this is what slots is for.
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