Hello,
I can't understand some specific behaviour of the exec statment.
For example, say that I create such a class A :
class A:
def __init__(self):
self.n = 3
self.m = None
def h(self, ini):
n = self.n
m = self.m
if ini: exec("def m(x): return n+x"); self.m=m
else: m(7)
Now :
obj = A()
obj.h(1)
obj.h(0)
I get :
Traceback (most recent call last):
File "<input>", line 1, in ?
File "<input>", line 9, in h
File "<string>", line 1, in m
NameError: global name 'n' is not defined
Now, suppose I would like to make exactly the same without exec :
class A:
def __init__(self):
self.n = 3
self.m = None
def h(self, ini):
n = self.n
m = self.m
if ini:
def m(x): return n+x
self.m=m
else: return m(7)
je lance :
obj = A()
obj.h(1)
obj.h(0)
This time, it works fine !!!
If I knew why the first doesn't work, and the second does, it would be a
great help for me for my program...
Thank you very much !
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