python - Unstable behaviour of has_key shelve method -


i've been using shelve library python (not in multiprocessing environment), , i've been observing unstable behaviour when using has_key() method. returns true , false, when know key exists in shelve. usual cause of such behaviour?

import shelve  some_key = 'not relevant' s = shelve.open('cache.db') if s.has_key(some_key):    var = s[some_key]    print 'found key', some_key  s.close()

note: python 2.7, ubuntu 14.04 in vm virtualbox, running in i7 x86-64bit


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