On 5/8/18 3:55 AM, Alexey Muranov wrote:
Sorry, i was confused. I would say that this mostly works as
expected, though the difference between
x = 42
class C:
x = x # Works
and
def f2(a):
class D:
a = a # Does not work <<<<<
return D
is still surprising to me.
Otherwise, probably the solution with
def f(a):
_a = a
class D:
a = _a
return D
is good enough, if Python does not allow to refer "simultaneously" to
variables from different scopes if they have the same name.
Alexey.
I'm curious to see the real code you're writing that uses this style of
class creation. It feels like there might be an easier way to achieve
your goal.
--Ned.
On Tue, 8 May, 2018 at 12:21 AM, Alexey Muranov
<alexey.mura...@gmail.com> wrote:
To be more exact, i do see a few workarounds, for example:
def f4(a):
b = a
class D:
a = b # Works
return D
But this is not what i was hoping for.
Alexey.
On Tue, 8 May, 2018 at 12:02 AM, Alexey Muranov
<alexey.mura...@gmail.com> wrote:
I have discovered the following bug or problem: it looks like i am
forced to choose different names for class attributes and function
arguments, and i see no workaround. Am i missing some special
syntax feature ?
Alexey.
---
x = 42
class C1:
y = x # Works
class C2:
x = x # Works
# ---
def f1(a):
class D:
b = a # Works
return D
def f2(a):
class D:
a = a # Does not work <<<<<
return D
def f3(a):
class D:
nonlocal a
a = a # Does not work either <<<<<
return D
# ---
def g1(a):
def h():
b = a # Works
return b
return h
def g2(a):
def h():
a = a # Does not work (as expected)
return a
return h
def g3(a):
def h():
nonlocal a
a = a # Works
return a
return h
# ---
if __name__ == "__main__":
assert C1.y == 42
assert C2.x == 42
assert f1(13).b == 13
try:
f2(13) # NameError
except NameError:
pass
except Exception as e:
raise Exception( 'Unexpected exception raised: '
'{}'.format(type(e).__name__) )
else:
raise Exception('No exception')
try:
f3(13).a # AttributeError
except AttributeError:
pass
except Exception as e:
raise Exception( 'Unexpected exception raised: '
'{}'.format(type(e).__name__) )
else:
raise Exception('No exception')
assert g1(13)() == 13
try:
g2(13)() # UnboundLocalError
except UnboundLocalError:
pass
except Exception as e:
raise Exception( 'Unexpected exception raised: '
'{}'.format(type(e).__name__) )
else:
raise Exception('No exception')
assert g3(13)() == 13
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