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python list by value not by reference [duplicate]
... 2-dimensional list, this is not going to work
– Pythoner
Jun 25 '18 at 14:55
For 2D arrays it's possible use map func...
How to call an external command?
... Hello World").read()
but it is nice to have all of the options there in one unified class instead of 4 different popen functions. See the documentation.
The call function from the subprocess module. This is basically just like the Popen class and takes all of the same arguments, but it simply w...
Check if a method exists
...or(someMethod:withParams:)]
This may be useful if you would like to call one constructor or another one depending on this (I mean, before having the instance itself).
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What are the differences between utf8_general_ci and utf8_unicode_ci? [duplicate]
...general_ci is a very simple — and on Unicode, very broken — collation, one that gives incorrect results on general Unicode text. What it does is:
converts to Unicode normalization form D for canonical decomposition
removes any combining characters
converts to upper case
This does not wo...
python numpy ValueError: operands could not be broadcast together with shapes
...hape (97,2)
y, shape (2,1)
With Numpy arrays, the operation
X * y
is done element-wise, but one or both of the values can be expanded in one or more dimensions to make them compatible. This operation are called broadcasting. Dimensions where size is 1 or which are missing can be used in broadca...
Benchmarking small code samples in C#, can this implementation be improved?
...just updated to use Stopwatch.StartNew. Not a functional change, but saves one line of code.
– LukeH
Jun 26 '09 at 13:23
1
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How to format date and time in Android?
...that both claim to give you a result that is set to the default Locale but one doesn't. So yes, don't forget to use the android.text.format version of DateFormat (that doesn't even derive the java.util one LOL).
– mxcl
Jul 20 '10 at 14:14
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Does ruby have real multithreading?
...s here: the
Ruby Programming Language and the specific threading model of one
specific implementation of the Ruby Programming Language. There
are currently around 11 different implementations of the Ruby
Programming Language, with very different and unique threading
models.
(Unfortunately, onl...
INSERT IF NOT EXISTS ELSE UPDATE?
...ould be" solutions for the classic "How do I insert a new record or update one if it already exists" but I cannot get any of them to work in SQLite.
...
Why does flowing off the end of a non-void function without returning a value not produce a compiler
...ur, and in practice it's calling convention and architecture dependent. On one particular system, with one particular compiler, the return value is the result of last expression evaluation, stored in the eax register of that system's processor.
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