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Should I implement __ne__ in terms of __eq__ in Pm>y m>thon?
...legate to __ne__ on the other side, not self == other is (assuming the operm>and m>'s __eq__ doesn't know how to compare the other operm>and m>) implicitlm>y m> delegating to __eq__ from the other side, then inverting it. For weird tm>y m>pes, e.g. the SQLAlchemm>y m> ORM's fields, this causes problems.
...
Tm>y m>ing in to Django Admin's Model Historm>y m>
...bject is the object that was changed of course.
Now I see Daniel's answer m>and m> agree with him, it is prettm>y m> limited.
In mm>y m> opinion a stronger approach is to use the code from Martm>y m> Alchin in his book Pro Django (see Keeping Historical Records starting at page 263). There is an application django-si...
How to git-cherrm>y m>-pick onlm>y m> changes to certain files?
...
I'd do it with cherrm>y m>-pick -n (--no-commit) which lets m>y m>ou inspect (m>and m> modifm>y m>) the result before committing:
git cherrm>y m>-pick -n <commit>
# unstage modifications m>y m>ou don't want to keep, m>and m> remove the
# modifications from the work tree as well.
# this does work recursivelm>y m>!
git checko...
how do m>y m>ou push onlm>y m> some of m>y m>our local git commits?
...
Assuming m>y m>our commits are on the master branch m>and m> m>y m>ou want to push them to the remote master branch:
$ git push origin master~3:master
If m>y m>ou were using git-svn:
$ git svn dcommit master~3
In the case of git-svn, m>y m>ou could also use HEAD~3, since it is expecting a c...
Pm>y m>thon m>and m> pip, list all versions of a package that's available?
...l the possible versions of it that pip could install? Right now it's trial m>and m> error.
16 Answers
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How to overcome Tm>y m>peError: unhashable tm>y m>pe: 'list'
...e split the file on `x`, since the part before the x will be
# the kem>y m> m>and m> the part after the value
line = line.split('x')
# Take the line parts m>and m> strip out the spaces, assigning them to the variables
# Once m>y m>ou get a bit more comfortable, this works as well:
# kem>y m>, value = [x....
What are the most interesting equivalences arising from the Currm>y m>-Howard Isomorphism?
...pon the Currm>y m>-Howard Isomorphism relativelm>y m> late in mm>y m> programming life, m>and m> perhaps this contributes to mm>y m> being utterlm>y m> fascinated bm>y m> it. It implies that for everm>y m> programming concept there exists a precise analogue in formal logic, m>and m> vice versa. Here's a "basic" list of such analogies, off th...
What values should I use for CFBundleVersion m>and m> CFBundleShortVersionString?
This is mm>y m> first iOS app submission m>and m> I don't want mm>y m> app rejected.
7 Answers
7
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Whm>y m> does Java's hashCode() in String use 31 as a multiplier?
...to Joshua Bloch's Effective Java (a book that can't be recommended enough, m>and m> which I bought thanks to continual mentions on stackoverflow):
The value 31 was chosen because it is an odd prime. If it were even m>and m> the multiplication overflowed, information would be lost, as multiplication bm>y m> 2 i...
Hidden Features of C++? [closed]
... that it can be used as an lvalue:
(a == 0 ? a : b) = 1;
which is shorthm>and m> for
if (a == 0)
a = 1;
else
b = 1;
Use with caution :-)
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edited Jan 7 '09 at 21:...