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Fix #11491. When dbm.open was called with a file which already exists and

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the "flag" argument is "n", dbm.error was being raised. As documented,
dbm.open(...,flag='n') will now "Always create a new, empty database,
open for reading and writing", regardless of a previous file existing.
This commit is contained in:
briancurtin 2011-03-14 15:35:35 -04:00
parent 250324952e
commit 94eceeb89c
4 changed files with 16 additions and 3 deletions
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6
Lib/dbm/__init__.py
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@ -68,10 +68,10 @@ def open(file, flag = 'r', mode = 0o666):
if not _defaultmod:
raise ImportError("no dbm clone found; tried %s" % _names)
# guess the type of an existing database
result = whichdb(file)
# guess the type of an existing database, if not creating a new one
result = whichdb(file) if 'n' not in flag else None
if result is None:
# db doesn't exist
# db doesn't exist or 'n' flag was specified to create a new db
if 'c' in flag or 'n' in flag:
# file doesn't exist and the new flag was used so use default type
mod = _defaultmod