On 06/11/2015 16:12, Lorenzo Sutton wrote:
On 06/11/2015 13:30, Bartc wrote:
On 06/11/2015 02:33, wa...@travelsky.com wrote:
Hello, python-list guys:
I am a newbie of python from Beijing. China.
I have a question about "math.pi".
As you can see in the attachment, why i can modify "math.pi"?
(in "mathmodule.c" "pi" is a "static const double")
Python isn't C.
Your attachment isn't visible, but it can be demonstrated easily:
import math
math.pi=0
print (math.pi)
In Python, presumably 'pi' is just another variable, and variables can
be written to.
(Perhaps math.pi would be better off as a function.)
Still nothing stops you from doing:
math.sin = 0
If you really want to?
Well, you might notice something is wrong when you try and do math.sin(x)!
But I see your point. Even a function can be set to another function, or
to one that returns a nonsense value.
Is there no way then in Python to declare:
pi = 3.141519 # etc
and make it impossible to override?
--
Bartc
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