Hi, folks.
I know that it is not possible to change local vars via `locals()` (except
in module-level).
```
import sys
def f1():
x = 1
d = locals()
d['x'] = 2
print(x) #=> 1 (not changed)
f1()
```
But I found that it is possible in class definition.
```
import sys
class Foo:
x = 1
d = locals()
d['x'] = 2
print(x) #=> 2 (changed!!!)
```
Can anyone explain about difference between above two?
Why it is possiable to change local var via `locals()` only in class
definition?
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