New issue 2466: request for the capability of updating local variable list
using locals().update()
https://bitbucket.org/pypy/pypy/issues/2466/request-for-the-capability-of-updating
Wang Xuancong:
The ability of updating local variable name list becomes important and useful
when we talk about meta-programming. For example, we can use the following line
to save and load all local variables instead of importing json and writing down
every variable we want to save/load:
```
print >>open('model.txt','w'), locals()
locals().update(eval(open('model.txt').read()))
```
This functionality is particularly useful in designing neural networks using
Tensorflow/Theano/etc. We can snapshot/restore all local variables so that we
can continue to work on from somewhere else.
However, due to interpreter optimization, python is not designed to do this:
[https://docs.python.org/2/library/functions.html#locals](Link URL), the same
holds for PyPy:
```
>>>> def f1():
.... locals().update({'aa':5})
.... print aa
....
>>>> f1()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 3, in f1
NameError: global name 'aa' is not defined
```
Since PyPy has built-in JIT, it does not need to be too concerned about
interpreter optimization. Thus, I hope this functionality can be implemented in
PyPy as an advantage over Python.
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