Plain files

key = ...username, or session key, or whatever...

try:

f = open(key, "r")

data = f.read() # read previous data

f.close()

except IOError:

data = "" # no file yet: provide initial data

data = update(data, form) # do whatever must be done

f = open(key, "w")

f.write(data) # write new data

f.close()

# (could delete the file instead if updated data is empty)

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