I am having trouble understanding the correct use of 'shelve'.
I have a number of small programs that read and write to a single
shelve file (not multithreading though).
It seems that by writing to an existing entry I
sometimes corrupt the database. For instance, I get the problem
when a Python script has opened the file and read and written a few
objects it then tries to overwrite an existing entry:
cf = {}
FILE['correction factor'] = cf
FILE.sync()
The program then closes the file and terminates. Now if I go
back and look at the keys to the data base I find that
'correction factor' is no more and instead there is apparently
'correction factorr' (repetetion of last letter), however is
I try to use that key to access the data I get a KeyError.
I get the same pattern of corrupted key with other entries too (last
letter repeats).
It appears that by deleteing the entry before hand
del FILE['correction factor']
FILE['correction factor'] = cf
the problem does not occur.
But I didn't think that this should be necessary.
Am I using shelve incorectly?
I have a number of small programs that read and write to a single
shelve file (not multithreading though).
It seems that by writing to an existing entry I
sometimes corrupt the database. For instance, I get the problem
when a Python script has opened the file and read and written a few
objects it then tries to overwrite an existing entry:
cf = {}
FILE['correction factor'] = cf
FILE.sync()
The program then closes the file and terminates. Now if I go
back and look at the keys to the data base I find that
'correction factor' is no more and instead there is apparently
'correction factorr' (repetetion of last letter), however is
I try to use that key to access the data I get a KeyError.
I get the same pattern of corrupted key with other entries too (last
letter repeats).
It appears that by deleteing the entry before hand
del FILE['correction factor']
FILE['correction factor'] = cf
the problem does not occur.
But I didn't think that this should be necessary.
Am I using shelve incorectly?