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How do I view an older version of an SVN file?
... than trying to view a diff of the file in the command line ( very hard to read ), is there any way I could get a copy of that file to review so I can study it to recover parts?
...
What is the equivalent of MATLAB's repmat in NumPy
...le asking to manipulate the input matrix along the dimensions the matrix already has.
Thus the two commands
repmat(M,m,n) % matlab
np.tile(M,(m,n)) # python
are really equivalent for a matrix of rank 2 (two dimensions).
The matters goes counter-intuitive when you ask for repetition/tiling o...
When is JavaScript synchronous?
...
JavaScript is always synchronous and single-threaded. If you're executing a JavaScript block of code on a page then no other JavaScript on that page will currently be executed.
JavaScript is only asynchronous in the sense that it can make, for example, Ajax calls. The A...
In practice, what are the main uses for the new “yield from” syntax in Python 3.3?
...at sending data to a generator even means, you need to drop everything and read about coroutines first—they're very useful (contrast them with subroutines), but unfortunately lesser-known in Python. Dave Beazley's Curious Course on Coroutines is an excellent start. Read slides 24-33 for a quick pr...
Find an element in a list of tuples
...
Read up on List Comprehensions
[ (x,y) for x, y in a if x == 1 ]
Also read up up generator functions and the yield statement.
def filter_value( someList, value ):
for x, y in someList:
if x == value :
...
Django auto_now and auto_now_add
...e this fields in admin (though, you won't be able to edit it), you can add readonly_fields to your admin class.
class SomeAdmin(ModelAdmin):
readonly_fields = ("created","modified",)
Well, this applies only to latest Django versions (I believe, 1.3 and above)
...
Find unused npm packages in package.json
...
echo "--------------------------"
echo "Checking $1..."
while read PACKAGE
do
RES=$(cat $FILES | xargs -I {} egrep -i "(import|require).*['\"]$PACKAGE[\"']" '{}' | wc -l)
if [ $RES = 0 ]
then
echo -e "UNUSED\t\t $PACKAGE"
else
...
Are list-comprehensions and functional functions faster than “for loops”?
...e visual complexity of the code).
Chances are, if code like this isn't already fast enough when written in good non-"optimized" Python, no amount of Python level micro optimization is going to make it fast enough and you should start thinking about dropping to C. While extensive micro optimization...
Deleting lines from one file which are in another file
...
Try comm instead (assuming f1 and f2 are "already sorted")
comm -2 -3 f1 f2
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Does C# have extension properties?
...hampion but it wasn't released yet, most of all because even if there is already an implementation, they want to make it right from the start.
But it will ...
There is an extension members item in the C# 7 work list so it may be supported in the near future. The current status of extension propert...