lru-dict segfaults on use after being serialized/deserialized with pickle

[zmjjmz]

It's always a bit weird to hit a segfault in Python!

Here's a simple example that hits this issue:

import pickle                                             
from lru import LRU                                       
                                                          
key_limit = 10                                            
a = LRU(key_limit)                                        
for i in range(key_limit - 5):                            
    a[i] = key_limit - i                                  
print(a[0])                                               
                                                          
with open("/vol/data0/tmp/example_lru.pkl",'wb') as f:     
    print("Saving LRU")                                   
    pickle.dump(a, f, pickle.HIGHEST_PROTOCOL)            
                                                          
                                                          
with open("/vol/data0/tmp/example_lru.pkl",'rb') as f:     
    print("Loading LRU")                                  
    b = pickle.load(f)                                    
                                                          
print(b[0])                                               

Output:

10
Saving LRU
Loading LRU
Segmentation fault (core dumped)

Not sure if you've intended the LRU to survive serialization / deserialization, but if not I'd understand closing this.

Thanks!

[amitdev]

Serialization/deserialization is not supported, but I'll leave this ticket for sometime. Maybe someone (or I) might fix it later.