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Python mysqldb: Library not loaded: libmysqlclient.18.dylib
...s in your source files.
Also compared to yoshisurfs answer, most of the time when mysql gets installed the mysql directory should be renamed to just mysql, not the whole file name, for ease of use.
export DYLD_LIBRARY_PATH=/usr/local/mysql/lib:$DYLD_LIBRARY_PATH
...
Principal component analysis in Python
...g signal is a sinusoidally modulated image
img = lena()
t = np.arange(100)
time = np.sin(0.1*t)
real = time[:,np.newaxis,np.newaxis] * img[np.newaxis,...]
# we add some noise
noisy = real + np.random.randn(*real.shape)*255
# (observations, features) matrix
M = noisy.reshape(noisy.shape[0],-1)
# s...
Best practices for circular shift (rotate) operations in C++
... MIPS that only provide a rotate-right. (This optimizes away with compile-time-constant counts.)
Fun fact: ARM doesn't really have dedicated shift/rotate instructions, it's just MOV with the source operand going through the barrel-shifter in ROR mode: mov r0, r0, ror r1. So a rotate can fold into...
Greenlet Vs. Threads
...es to complete the work and this test shows nothing (also did you take the timeout off of the gevent.joinall() call?). Try using a thread pool of about 50 threads, see my answer: stackoverflow.com/a/51932442/34549
– zzzeek
Aug 20 '18 at 14:14
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multiprocessing: sharing a large read-only object between processes?
...objects could be pickled Python objects to save a tiny bit of file reading time.
Write a startup program that (1) reads your original gigantic object and writes a page-structured, byte-coded file using seek operations to assure that individual sections are easy to find with simple seeks. This is wh...
How can I efficiently download a large file using Go?
...o you can use any functions that take a Reader, to, e.g. read a chunk at a time rather than all at once. In this specific case, io.Copy() does the gruntwork for you.
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Extending the User model with custom fields in Django
...OFILE_MODULE = 'YOURAPP.UserProfile'
This will create a userprofile each time a user is saved if it is created.
You can then use
user.get_profile().whatever
Here is some more info from the docs
http://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users
Upd...
From io.Reader to string in Go
...I can't imagine a scenario where transmission latency won't be a squillion times larger than the trivial time it takes to copy the byte array. Any functional language copies this type of immutable stuff around all over the place, and still runs plenty fast.
– see sharper
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In C#, should I use string.Empty or String.Empty or “” to intitialize a string?
...readable.
Other answers have suggested that a new string is created every time you use "". This is not true - due to string interning, it will be created either once per assembly or once per AppDomain (or possibly once for the whole process - not sure on that front). This difference is negligible -...
Why does struct alignment depend on whether a field type is primitive or user-defined?
In Noda Time v2, we're moving to nanosecond resolution. That means we can no longer use an 8-byte integer to represent the whole range of time we're interested in. That has prompted me to investigate the memory usage of the (many) structs of Noda Time, which has in turn led me to uncover a slight ...