[pypy-dev] Pickling generators

Matti Picus matti.picus at gmail.com
Fri Dec 11 08:21:18 EST 2020

According to issue 3150 
https://foss.heptapod.net/pypy/pypy/-/issues/3150, this is on purpose, 
and brings us into feature compatibility with CPython:

Python 3.8.6 | packaged by conda-forge | (default, Oct  7 2020, 19:08:05)
[GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
 >>> import pickle
 >>> def f():
...     yield 10
 >>> gen = f()
 >>> pickle.dumps(gen)
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: cannot pickle 'generator' object

I guess we could improve the error message to be more helpful. Do you 
have a concrete use case for this?


On 12/11/20 1:55 PM, Ioannis Foufoulas wrote:
> Hi,
> While in PyPy was possible to pickle a generator function and resume after unpicking this does not happen with PyPy3:
> File "/snap/pypy3/72/lib-python/3/pickle.py", line 942, in save_global
>      (obj, module_name, name))
> pickle.PicklingError: Can't pickle <class 'generator'>: it's not found as builtins.generator
> Is this a bug or this feature is removed in PyPy3?
> Thanks,
> Yannis
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