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Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala
... too. This is why summing integers in a list is O(log N) if given an infinite number of CPUs.
If you just look at the signatures there is no reason for reduce to exist because you can achieve everything you can with reduce with a foldLeft. The functionality of foldLeft is a greater than the funct...
Nested defaultdict of defaultdict
... to make a defaultdict also be the default for the defaultdict? (i.e. infinite-level recursive defaultdict?)
7 Answers
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How well is Unicode supported in C++11?
...ibrary support unicode?
Terribly.
A quick scan through the library facilities that might provide Unicode support gives me this list:
Strings library
Localization library
Input/output library
Regular expressions library
I think all but the first one provide terrible support. I'll get back to i...
How can I select and upload multiple files with HTML and PHP, using HTTP POST?
I have experience doing this with single file uploads using <input type="file"> . However, I am having trouble doing uploading more than one at a time.
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What are the differences between json and simplejson Python modules?
... more frequently than Python, so if you need (or want) the latest version, it's best to use simplejson itself, if possible.
A good practice, in my opinion, is to use one or the other as a fallback.
try:
import simplejson as json
except ImportError:
import json
...
Best way to replace multiple characters in a string?
...cing two characters
I timed all the methods in the current answers along with one extra.
With an input string of abc&def#ghi and replacing & -> \& and # -> \#, the fastest way was to chain together the replacements like this: text.replace('&', '\&').replace('#', '\#').
T...
What's Mongoose error Cast to ObjectId failed for value XXX at path “_id”?
...sending a request to /customers/41224d776a326fb40f000001 and a document with _id 41224d776a326fb40f000001 does not exist, doc is null and I'm returning a 404 :
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Fastest way to get the first object from a queryset in django?
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edited Jul 28 at 21:01
Boris
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How to disable Django's CSRF validation?
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edited Oct 1 '19 at 16:36
Lutz Prechelt
26.4k55 gold badges4949 silver badges7171 bronze badges
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How to check BLAS/LAPACK linkage in NumPy and SciPy?
...n about linkage gathered at build time. My output looks like this. I think it means I am using the BLAS/LAPACK that ships with Mac OS.
>>> import numpy as np
>>> np.show_config()
lapack_opt_info:
extra_link_args = ['-Wl,-framework', '-Wl,Accelerate']
extra_compile_args =...