cpython/Demo/classes/Dbm.py
Benjamin Peterson 2a691a8149 Merged revisions 62021,62029,62035-62038,62043-62044,62052-62053 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r62021 | benjamin.peterson | 2008-03-28 18:11:01 -0500 (Fri, 28 Mar 2008) | 2 lines

  NIL => NULL
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  r62029 | amaury.forgeotdarc | 2008-03-28 20:42:31 -0500 (Fri, 28 Mar 2008) | 3 lines

  Correctly call the base class tearDown();
  otherwise running test_logging twice produce the errors we see on all buildbots
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  r62035 | raymond.hettinger | 2008-03-29 05:42:07 -0500 (Sat, 29 Mar 2008) | 1 line

  Be explicit about what efficient means.
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  r62036 | georg.brandl | 2008-03-29 06:46:18 -0500 (Sat, 29 Mar 2008) | 2 lines

  Fix capitalization.
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  r62037 | amaury.forgeotdarc | 2008-03-29 07:42:54 -0500 (Sat, 29 Mar 2008) | 5 lines

  lib2to3 should install a logging handler only when run as a main program,
  not when used as a library.

  This may please the buildbots, which fail when test_lib2to3 is run before test_logging.
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  r62043 | benjamin.peterson | 2008-03-29 10:24:25 -0500 (Sat, 29 Mar 2008) | 3 lines

  #2503 make singletons compared with "is" not == or !=
  Thanks to Wummel for the patch
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  r62044 | gerhard.haering | 2008-03-29 14:11:52 -0500 (Sat, 29 Mar 2008) | 2 lines

  Documented the lastrowid attribute.
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  r62052 | benjamin.peterson | 2008-03-30 14:35:10 -0500 (Sun, 30 Mar 2008) | 2 lines

  Updated README regarding doc formats
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  r62053 | georg.brandl | 2008-03-30 14:41:39 -0500 (Sun, 30 Mar 2008) | 2 lines

  The other download formats will be available for 2.6 too.
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2008-03-31 01:51:45 +00:00

66 lines
1.5 KiB
Python
Executable file

# A wrapper around the (optional) built-in class dbm, supporting keys
# and values of almost any type instead of just string.
# (Actually, this works only for keys and values that can be read back
# correctly after being converted to a string.)
class Dbm:
def __init__(self, filename, mode, perm):
import dbm
self.db = dbm.open(filename, mode, perm)
def __repr__(self):
s = ''
for key in self.keys():
t = repr(key) + ': ' + repr(self[key])
if s: t = ', ' + t
s = s + t
return '{' + s + '}'
def __len__(self):
return len(self.db)
def __getitem__(self, key):
return eval(self.db[repr(key)])
def __setitem__(self, key, value):
self.db[repr(key)] = repr(value)
def __delitem__(self, key):
del self.db[repr(key)]
def keys(self):
res = []
for key in self.db.keys():
res.append(eval(key))
return res
def has_key(self, key):
return repr(key) in self.db
def test():
d = Dbm('@dbm', 'rw', 0o600)
print(d)
while 1:
try:
key = eval(input('key: '))
if key in d:
value = d[key]
print('currently:', value)
value = eval(input('value: '))
if value is None:
del d[key]
else:
d[key] = value
except KeyboardInterrupt:
print('')
print(d)
except EOFError:
print('[eof]')
break
print(d)
test()