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bpo-36232: Improve error message on dbm.open() when the db doesn't exist (GH-12060)

This commit is contained in:
Marco Rougeth 2019-04-30 00:23:28 +01:00 committed by Brett Cannon
parent 9bdd6d1c2a
commit 81c5a90595
3 changed files with 5 additions and 2 deletions
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3
Lib/dbm/__init__.py
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@ -82,7 +82,8 @@ def open(file, flag='r', mode=0o666):
# file doesn't exist and the new flag was used so use default type # file doesn't exist and the new flag was used so use default type
mod = _defaultmod mod = _defaultmod
else: else:
raise error[0]("need 'c' or 'n' flag to open new db") raise error[0]("db file doesn't exist; "
"use 'c' or 'n' flag to create a new db")
elif result == "": elif result == "":
# db type cannot be determined # db type cannot be determined
raise error[0]("db type could not be determined") raise error[0]("db type could not be determined")

2
Misc/NEWS.d/next/Library/2019-03-20-15-13-18.bpo-36366.n0eav_.rst
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@ -1,4 +1,4 @@
Calling ``stop()`` on an unstarted or stopped :func:`unittest.mock.patch` Calling ``stop()`` on an unstarted or stopped :func:`unittest.mock.patch`
object will now return `None` instead of raising :exc:`RuntimeError`, object will now return `None` instead of raising :exc:`RuntimeError`,
making the method idempotent. making the method idempotent.
Patch byKarthikeyan Singaravelan. Patch by Karthikeyan Singaravelan.

2
Misc/NEWS.d/next/Library/2019-04-06-20-25-25.bpo-36232.SClmhb.rst Normal file
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@ -0,0 +1,2 @@
Improve error message when trying to open existing DBM database that
actually doesn't exist. Patch by Marco Rougeth.