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python Programming Glossary: slowerWhat is different between all these OpenCV Python interfaces? http://stackoverflow.com/questions/10417108/what-is-different-between-all-these-opencv-python-interfaces cvSet2D cvGet2D etc. And some discussions say they are slower. For imageROI you need special functions like cvSetImageROI..
Principal component analysis in Python http://stackoverflow.com/questions/1730600/principal-component-analysis-in-python high dimensional ~460 dimensions so I think SVD will be slower than computing the eigenvectors of the covariance matrix. I..
Simple Python Challenge: Fastest Bitwise XOR on Data Buffers http://stackoverflow.com/questions/2119761/simple-python-challenge-fastest-bitwise-xor-on-data-buffers a marginal improvement. The first invocation is a bit slower since the code needs to be loaded from the disk and cached subsequent..
How to clone a list in python? http://stackoverflow.com/questions/2612802/how-to-clone-a-list-in-python import copy new_list copy.copy old_list This is a little slower than list because it has to find out the datatype of old_list..
Speed up bitstring/bit operations in Python? http://stackoverflow.com/questions/2897297/speed-up-bitstring-bit-operations-in-python yourself before posting. I can't accept answers that run slower than my existing code naturally. Edit again I've compiled a..
Multiprocessing vs Threading Python http://stackoverflow.com/questions/3044580/multiprocessing-vs-threading-python interpreter lock is for. Spawning processes is a bit slower than spawning threads. Once they are running there is not much..
How do I check if a string is a number in Python? http://stackoverflow.com/questions/354038/how-do-i-check-if-a-string-is-a-number-in-python both. A regex or other string parsing would be uglier and slower. I'm not sure that anything much could be faster than the above...
Remove empty strings from a list of strings http://stackoverflow.com/questions/3845423/remove-empty-strings-from-a-list-of-strings str_list # fastest str_list filter len str_list # a bit of slower str_list filter lambda item item str_list # slower than list.. bit of slower str_list filter lambda item item str_list # slower than list comprehension Tests timeit 'filter None str_list '..
Python: List vs Dict for look up table http://stackoverflow.com/questions/513882/python-list-vs-dict-for-look-up-table and use binary search. This is O log n and is likely to be slower for strings impossible for objects which do not have a natural..
What are some good Python ORM solutions? [closed] http://stackoverflow.com/questions/53428/what-are-some-good-python-orm-solutions than I really need i.e. more features than I really need slower . Anyone have any experience with different Python ORM solutions..
Is shared readonly data copied to different processes for Python multiprocessing? http://stackoverflow.com/questions/5549190/is-shared-readonly-data-copied-to-different-processes-for-python-multiprocessing are not very regular so I expect memmapped arrays to be slower. The above seemed like the first thing to try. This is on Linux...
Speed comparison with Project Euler: C vs Python vs Erlang vs Haskell http://stackoverflow.com/questions/6964392/speed-comparison-with-project-euler-c-vs-python-vs-erlang-vs-haskell values are less than MAXINT In Haskell using Integer is slower than Int but how much slower depends on the computations performed... In Haskell using Integer is slower than Int but how much slower depends on the computations performed. Luckily for 64 bit machines..
Why is reading lines from stdin much slower in C++ than Python? http://stackoverflow.com/questions/9371238/why-is-reading-lines-from-stdin-much-slower-in-c-than-python is reading lines from stdin much slower in C than Python I wanted to compare reading lines of string.. and was shocked to see my C code run an order of magnitude slower than the equivalent Python code. Since my C is rusty and I'm.. of this version is quite fast though still a bit slower than the raw c wc utility of course usr bin time cat temp_big_file..
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