education-10-x86-64-alpha ~ # python3 test.py
my_value
Exception ignored in: <function CacheManager.__del__ at 0x7f266d5970d0>
Traceback (most recent call last):
  File "/usr/lib/python3/site-packages/cacheman/cacher.py", line 28, in __del__
  File "/usr/lib/python3/site-packages/cacheman/cacher.py", line 134, in save_all_cache_contents
  File "/usr/lib/python3/site-packages/cacheman/cacher.py", line 129, in save_cache_contents
  File "/usr/lib/python3/site-packages/cacheman/autosync.py", line 106, in save
  File "/usr/lib/python3/site-packages/cacheman/cachewrap.py", line 211, in save
  File "/usr/lib/python3/site-packages/cacheman/cachewrap.py", line 332, in saver
  File "/usr/lib/python3/site-packages/cacheman/cachewrap.py", line 111, in _manager_pickle_saver
  File "/usr/lib/python3/site-packages/cacheman/registers.py", line 125, in pickle_saver
  File "/usr/lib/python3/site-packages/cacheman/registers.py", line 138, in pickle_pre_saver
NameError: name 'open' is not defined
Exception ignored in: <function CacheWrap.__del__ at 0x7f266d590790>
Traceback (most recent call last):
  File "/usr/lib/python3/site-packages/cacheman/cachewrap.py", line 45, in __del__
ImportError: sys.meta_path is None, Python is likely shutting down