Mercurial > cpython-lru_cache-weakref

annotate Demo/classes/Dbm.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 01a7e66525c2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # A wrapper around the (optional) built-in class dbm, supporting keys
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2 # and values of almost any type instead of just string.
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3 # (Actually, this works only for keys and values that can be read back
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4 # correctly after being converted to a string.)
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7 class Dbm:
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8
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9 def __init__(self, filename, mode, perm):
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10 import dbm
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11 self.db = dbm.open(filename, mode, perm)
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13 def __repr__(self):
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14 s = ''
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15 for key in self.keys():
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16 t = repr(key) + ': ' + repr(self[key])
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17 if s: t = ', ' + t
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18 s = s + t
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19 return '{' + s + '}'
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21 def __len__(self):
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22 return len(self.db)
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23
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24 def __getitem__(self, key):
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25 return eval(self.db[repr(key)])
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27 def __setitem__(self, key, value):
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28 self.db[repr(key)] = repr(value)
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30 def __delitem__(self, key):
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31 del self.db[repr(key)]
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32
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33 def keys(self):
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34 res = []
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35 for key in self.db.keys():
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36 res.append(eval(key))
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37 return res
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38
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39 def has_key(self, key):
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40 return self.db.has_key(repr(key))
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43 def test():
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44 d = Dbm('@dbm', 'rw', 0600)
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45 print d
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46 while 1:
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47 try:
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48 key = input('key: ')
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49 if d.has_key(key):
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50 value = d[key]
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51 print 'currently:', value
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52 value = input('value: ')
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53 if value is None:
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54 del d[key]
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55 else:
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56 d[key] = value
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57 except KeyboardInterrupt:
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58 print ''
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59 print d
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60 except EOFError:
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61 print '[eof]'
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62 break
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63 print d
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66 test()