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In Python, what is the difference between “.append()” and “+= []”?
..., 's = []').timeit()
0.44208112500000141
In general case append will add one item to the list, while += will copy all elements of right-hand-side list into the left-hand-side list.
Update: perf analysis
Comparing bytecodes we can assume that append version wastes cycles in LOAD_ATTR + CALL_FUNCT...
Is it worth using Python's re.compile?
...ekey = (type(key[0]),) + key
p = _cache.get(cachekey)
if p is not None: return p
# ...
# Does actual compilation on cache miss
# ...
# Caches compiled regex
if len(_cache) >= _MAXCACHE:
_cache.clear()
_cache[cachekey] = p
return p
I still often pre-...
Injecting Mockito mocks into a Spring bean
...n this case it will inject mockedObject into the testObject. This was mentioned above but here is the code.
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Amazon S3 direct file upload from client browser - private key disclosure
...PI using only JavaScript, without any server-side code. All works fine but one thing is worrying me...
9 Answers
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How do I know if a generator is empty from the start?
... typical implementation doesn't even calculate a value until it is needed. One could force the interface to do this, but that might be sub-optimal for lightweight implementations.
– David Berger
Jan 30 '13 at 20:54
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MYSQL OR vs IN performance
...according to the type of expr and sorted. The search for the item then is done using a binary search. This means IN is very quick if the IN value list consists entirely of constants . Otherwise, type conversion takes place according to the rules described at Type Conversion, but applied to all the ...
Set Page title using UI-Router
...) }">
// will set the <li> to active whenever 'contacts.list' or one of its
// decendents is active.
.run([ '$rootScope', '$state', '$stateParams',
function ($rootScope, $state, $stateParams) {
$rootScope.$state = $state;
$rootScope.$stateParams = $stateParams;
}])
With this define...
Check if string contains only whitespace
...f there are only whitespace characters in the string and there is at least one character, False otherwise.
A character is whitespace if in the Unicode character database (see unicodedata), either its general category is Zs (“Separator, space”), or its bidirectional class is one of WS, B, or S.
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How can I exclude all “permission denied” messages from “find”?
...principle, but trying to combine them with redirection from stderr, as is done here (2> >(...)), appears to be silently ignored (in ksh 93u+).
grep -v 'Permission denied' filters out (-v) all lines (from the find command's stderr stream) that contain the phrase Permission denied and outputs ...
What must I know to use GNU Screen properly? [closed]
... Screen utility, the same things that you'd think worthwhile to teach someone, a beginner, from the ground up. What are some analogies and handy tips for remembering binds, etc.?
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