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How do I mock an open used in a with statement (using the Mock framework in Python)?
...). If you use a MagicMock (as above) then enter and exit are preconfigured for you.
– fuzzyman
Jun 6 '11 at 19:15
5
...
In Python, if I return inside a “with” block, will the file still close?
...lso mentioned in one of the examples of PEP-343 which is the specification for the with statement:
with locked(myLock):
# Code here executes with myLock held. The lock is
# guaranteed to be released when the block is left (even
# if via return or by an uncaught exception).
Something ...
Why doesn't Python have a sign function?
...more verbose) can be used to delegate to the end user the desired behavior for edge cases - which sometimes might require the call to cmp(x,0).
I don't know why it's not a built-in, but I have some thoughts.
copysign(x,y):
Return x with the sign of y.
Most importantly, copysign is a superset o...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
... or a function( Xvec, centrevec ), e.g. Lqmetric below
p: for minkowski metric -- local mod cdist for 0 < p < 1 too
verbose: 0 silent, 2 prints running distances
out:
centres, k x dim
Xtocentre: each X -> its nearest centre, ints N -> k
...
Open file in a relative location in Python
...pe of thing you need to be careful what your actual working directory is. For example, you may not run the script from the directory the file is in. In this case, you can't just use a relative path by itself.
If you are sure the file you want is in a subdirectory beneath where the script is actua...
What is context in _.each(list, iterator, [context])?
...
context is where this refers to in your iterator function. For example:
var person = {};
person.friends = {
name1: true,
name2: false,
name3: true,
name4: true
};
_.each(['name4', 'name2'], function(name){
// this refers to the friends property of the person object
aler...
How to iterate for loop in reverse order in swift?
When I use the for loop in Playground, everything worked fine, until I changed the first parameter of for loop to be the highest value. (iterated in descending order)
...
What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
...ng'.
I'd expect them to be translated into something reasonably efficient for your current platform, whether it be one of those fancy bit-twiddling algorithms, or a single instruction.
A useful trick if your input can be zero is __builtin_clz(x | 1): unconditionally setting the low bit without m...
What is the purpose of willSet and didSet in Swift?
...metimes, you need a property that has automatic storage and some behavior, for instance to notify other objects that the property just changed. When all you have is get/set, you need another field to hold the value. With willSet and didSet, you can take action when the value is modified without need...
Macro vs Function in C
...os are error-prone because they rely on textual substitution and do not perform type-checking. For example, this macro:
#define square(a) a * a
works fine when used with an integer:
square(5) --> 5 * 5 --> 25
but does very strange things when used with expressions:
square(1 + 2) --> ...