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Are list-comprehensions and functional functions faster than “for loops”?
... in Python, is a list-comprehension, or functions like map() , filter() and reduce() faster than a for loop? Why, technically, they run in a C speed , while the for loop runs in the python virtual machine speed ?.
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Dynamic instantiation from string name of a class in dynamically imported module?
...tlib.import_module will load the .py file into a pyc if needed as well as handle the complete module.name.pathing.to.get.to.the class. __import__ will not do either of these things, in a django environment (not tested outside of this)
– James
Mar 11 '17 at 2:05...
Capturing Groups From a Grep RegEx
..._[0-9a-z]*"
for f in $files # unquoted in order to allow the glob to expand
do
if [[ $f =~ $regex ]]
then
name="${BASH_REMATCH[1]}"
echo "${name}.jpg" # concatenate strings
name="${name}.jpg" # same thing stored in a variable
else
echo "$f doesn't...
How update the _id of one MongoDB Document?
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You cannot update it. You'll have to save the document using a new _id, and then remove the old document.
// store the document in a variable
doc = db.clients.findOne({_id: ObjectId("4cc45467c55f4d2d2a000002")})
// set a new _id on the document
doc._id = ObjectId("4c8a331bda76c559ef000004")
//...
Dealing with commas in a CSV file
I am looking for suggestions on how to handle a csv file that is being created, then uploaded by our customers, and that may have a comma in a value, like a company name.
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How to sort two lists (which reference each other) in the exact same way
...rt(); zip(*tups)
100000 loops, best of 3: 2.84 us per loop
On the other hand, for larger lists, the one-line version could be faster:
>>> %timeit zip(*sorted(zip(list1, list2)))
100 loops, best of 3: 8.09 ms per loop
>>> %timeit tups = zip(list1, list2); tups.sort(); zip(*tups)
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What is the best practice for “Copy Local” and with project references?
I have a large c# solution file (~100 projects), and I am trying to improve build times. I think that "Copy Local" is wasteful in many cases for us, but I am wondering about best practices.
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How to get current route in Symfony 2?
...') is not reliable because it is for debug purpose only (symfony dev said) and does not work if request is forwarded... see supernova's answer which are documented and are more fail-safe
– luiges90
Nov 14 '12 at 2:38
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From an array of objects, extract value of a property as array
... it uses a syntax that wasn't available at the time you asked the question and isn't even supported in some browsers. I'd also note that this answer is a direct copy of comments that were made on the originally accepted answer nearly a year before this answer was posted.
– Aln...
Getting the SQL from a Django QuerySet [duplicate]
...use "Django never actually interpolates the parameters: it sends the query and the parameters separately to the database adapter, which performs the appropriate operations." Source: code.djangoproject.com/ticket/17741
– gregoltsov
Jul 7 '14 at 14:50
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