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| class A(object): | |
| def hook(self, f): | |
| atime = 0 | |
| def intime(*args): | |
| print atime | |
| atime += 1 | |
| return f(*args) | |
| return intime | |
| >>> f = A().hook(lambda b: b + 1) | |
| >>> f(1) | |
| Traceback (most recent call last): | |
| File "<stdin>", line 1, in <module> | |
| File "<stdin>", line 5, in intime | |
| UnboundLocalError: local variable 'atime' referenced before assignment | |
| >>> |
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| #!/usr/bin/env python3 | |
| class A(object): | |
| def hook(self, f): | |
| atime = 0 | |
| def intime(*args): | |
| nonlocal atime | |
| print(atime) | |
| atime += 1 | |
| return f(*args) | |
| return intime | |
| f = A().hook(lambda b: b + 1) | |
| # works as expected | |
| for i in range(10): | |
| f(i) |
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