Thomas 'PointedEars' Lahn wrote:
> In theory, it should be possible to substitute “math” with a reference to
> an object that acts as a proxy for the original “math” module object but
> whose base class declares the attributes for all the constants read-only.
#!/usr/bin/env python3
#---------------------------------------------------------------------------
import importlib
class MyMath(object):
def getter_factory (prop):
def getter (self):
return getattr(importlib.__import__("math", globals(), locals(),
[prop], 0), prop)
return getter
pi = property(getter_factory("pi"), lambda self, val: None,
lambda self: None)
e = property(getter_factory("e"), lambda self, val: None,
lambda self: None)
inf = property(getter_factory("inf"), lambda self, val: None,
lambda self: None)
nan = property(getter_factory("nan"), lambda self, val: None,
lambda self: None)
def __getattr__ (self, name):
return getattr(importlib.__import__("math", globals(), locals(),
[name], 0), name, None)
math = MyMath()
print(math.pi, math.e, math.inf, math.nan)
math.pi = 42
math.e = 42
math.inf = 42
math.nan = 42
print(math.pi, math.e, math.inf, math.nan)
print(math.ceil(2.41))
#---------------------------------------------------------------------------
Using property() instead of decorators here was intended to achieve DRY by
using a loop, but I could not find a way to define class attributes
dynamically. Suggestions?
--
PointedEars
Twitter: @PointedEars2
Please do not cc me. / Bitte keine Kopien per E-Mail.
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