590de399f0
When in a class body or at the module level don't implicitly close over variables that have been assigned to. Fixes issue #8603. Signed-off-by: Damien George <damien@micropython.org>
78 lines
1.5 KiB
Python
78 lines
1.5 KiB
Python
# test scoping rules that involve a class
|
|
|
|
# the inner A.method should be independent to the local function called method
|
|
def test1():
|
|
def method():
|
|
pass
|
|
|
|
class A:
|
|
def method():
|
|
pass
|
|
|
|
print(hasattr(A, "method"))
|
|
print(hasattr(A(), "method"))
|
|
|
|
|
|
test1()
|
|
|
|
|
|
# the inner A.method is a closure and overrides the local function called method
|
|
def test2():
|
|
def method():
|
|
return "outer"
|
|
|
|
class A:
|
|
nonlocal method
|
|
|
|
def method():
|
|
return "inner"
|
|
|
|
print(hasattr(A, "method"))
|
|
print(hasattr(A(), "method"))
|
|
return method() # this is actually A.method
|
|
|
|
|
|
print(test2())
|
|
|
|
|
|
# a class body will capture external variables by value (not by reference)
|
|
def test3(x):
|
|
class A:
|
|
local = x
|
|
|
|
x += 1
|
|
return x, A.local
|
|
|
|
|
|
print(test3(42))
|
|
|
|
|
|
# assigning to a variable in a class will implicitly prevent it from closing over a variable
|
|
def test4(global_):
|
|
class A:
|
|
local = global_ # fetches outer global_
|
|
global_ = "global2" # creates class attribute
|
|
|
|
global_ += 1 # updates local variable
|
|
return global_, A.local, A.global_
|
|
|
|
|
|
global_ = "global"
|
|
print(test4(42), global_)
|
|
|
|
|
|
# methods within a class can close over variables outside the class
|
|
def test5(x):
|
|
def closure():
|
|
return x
|
|
|
|
class A:
|
|
def method():
|
|
return x, closure()
|
|
|
|
closure = lambda: x + 1 # change it after A has been created
|
|
return A
|
|
|
|
|
|
print(test5(42).method())
|