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| author | Guido van Rossum <guido@python.org> | 2001-10-15 15:53:58 (GMT) |
|---|---|---|
| committer | Guido van Rossum <guido@python.org> | 2001-10-15 15:53:58 (GMT) |
| commit | a8bcf80e7bde79c722d4cb76ded118d9dd0ffbca (patch) | |
| tree | 76ccbbf9824a98598644f5566ae07352d82311a0 /Misc/NEWS | |
| parent | 1c917072ca2895a196de7f397d4e96bcc577e13d (diff) | |
| download | cpython-a8bcf80e7bde79c722d4cb76ded118d9dd0ffbca.zip cpython-a8bcf80e7bde79c722d4cb76ded118d9dd0ffbca.tar.gz cpython-a8bcf80e7bde79c722d4cb76ded118d9dd0ffbca.tar.bz2 | |
Note about fix in list comprehensions.
Diffstat (limited to 'Misc/NEWS')
| -rw-r--r-- | Misc/NEWS | 9 |
1 files changed, 9 insertions, 0 deletions
@@ -22,6 +22,15 @@ Type/class unification and new-style classes Core +- A very subtle syntactical pitfall in list comprehensions was fixed. + For example: [a+b for a in 'abc', for b in 'def']. The comma in + this example is a mistake. Previously, this would silently let 'a' + iterate over the singleton tuple ('abc',), yielding ['abcd', 'abce', + 'abcf'] rather than the intended ['ad', 'ae', 'af', 'bd', 'be', + 'bf', 'cd', 'ce', 'cf']. Now, this is flagged as a syntax error. + Note that [a for a in <singleton>] is a convoluted way to say + [<singleton>] anyway, so it's not like any expressiveness is lost. + - binascii has now two quopri support functions, a2b_qp and b2a_qp. - readline now supports setting the startup_hook and the pre_event_hook. |