Pickleing

[sirdeltalot]

Hi
I'm a total beginner in python.
Want i want to know is how to pickle a dictionary after a user has updated it then read back from the pickled file.
Thanks
Iz

[bvdet]

I used to use the following functions for saving and recalling a dictionary or list of dictionaries to a file using pickle.
[code=Python]import pickle

def import_data(fil e_name):
try:
f = open(file_name, "r")
except IOError, e:
# unable to open file
Warning("Defaul t file import error. Reverting to original defaults...")
return None

# file open is successful
try:

dd = pickle.Unpickle r(f).load()
f.close()
# test for a dictionary or list of dictionaries
if isinstance(dd, dict):
return dd
elif isinstance(dd, list):
for i, item in enumerate(dd):
if not isinstance(item , dict):
Warning("**INVA LID** List item %s is not a dictionary." % (i))
return None
# always return one dictionary
ddr = {}
for d in dd: ddr.update(d)
return ddr
else:
# dd is not a dictionary or list of dictionaries
Warning("Invali d imported data type.\nData must be a dictionary or list of dictionaries.")
return None

except:
# file is not compatible with Unpickler - close file and warn user
f.close()
Warning("Invali d defaults file. Reverting to original defaults...")
return None

def export_data(fil e_name, dd):
if check_Defaults_ dir(os.path.dir name(file_name) ):
# directory exists or was created
try:
f = open(file_name, "w")
pickle.Pickler( f).dump(dd)
f.close()
return True
except:
Warning("Defaul t values file export error.")
return False

else:
# directory did not exist and the user chose 'no' to create directory
Warning("The default values file export was aborted")
return False[/code]

[sirdeltalot]

That's realy helpful,
Thanks!