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34 lines (32 loc) · 1.05 KB
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file.py
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34 lines (32 loc) · 1.05 KB
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import os
import pickle
class File(object):
saved=[]
def __init__(self,name=None):
self.name = name
def __get__(self,obj,typ=None):
if self.name not in File.saved:
raise AttributeError,"%r used before assignment " % self.name
try:
f = open(self.name,"r")
val = pickle.load(f)
f.close()
return val
except (pickle.UnpicklingError,IOError,EOFError,AttributeError,\
ImportError,IndexError),e:
raise AttributeError,"could not read %r:%s" % (self.name,e)
def __set__(self,obj,val):
f = open(self.name,"w")
try:
pickle.dump(val,f)
File.saved.append(self.name)
except (TypeError,pickle.PicklingError),e:
raise AttributeError,"could not pickle %r " % self.name
finally:
f.close()
def __delete__(self,obj):
try:
os.unlink(self.name)
File.saved.remove(self.name)
except (OSError,ValueError),e:
pass