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Designing function f(f(n)) == -n
...
How about:
f(n) = sign(n) - (-1)n * n
In Python:
def f(n):
if n == 0: return 0
if n >= 0:
if n % 2 == 1:
return n + 1
else:
return -1 * (n - 1)
else:
if n % 2 == 1:
return n - 1
...
How do I see the commit differences between branches in git?
...ill display the full diff.
If you want to see visual diff, install meld on linux, or WinMerge on windows. Make sure they are the default difftools .Then use something like
git difftool -y origin/master..origin/develop --no-merges
In case you want to compare it with current branch. It is more conv...
Is there a built-in function to print all the current properties and values of an object?
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unpythonic, because follows not-invented-here
– user3850
Oct 10 '08 at 17:31
16
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Django dump data for a single model?
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Take all data into json format from django model.
Syntax:
python manage.py dumpdata app_name.model_name
For example dumping data from group_permission model which reside in default auth app in django.
python manage.py dumpdata auth.group_permission
For output take a look on con...
Can IntelliJ IDEA encapsulate all of the functionality of WebStorm and PHPStorm through plugins? [cl
...ate, you are welcome to report it and we'll consider adding it.
While PHP, Python and Ruby IDEA plug-ins are built from the same source code as used in PhpStorm, PyCharm and RubyMine, product release cycles are not synchronized. It means that some features may be already available in the lighter pro...
How do you remove Subversion control for a folder?
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On Linux, this will work:
find . -iname ".svn" -print0 | xargs -0 rm -r
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What is the difference between a symbolic link and a hard link?
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There is a good visual explanation in an article on Linux Gazette
– Rodrigue
May 5 '12 at 8:39
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What is the best way to repeatedly execute a function every x seconds?
I want to repeatedly execute a function in Python every 60 seconds forever (just like an NSTimer in Objective C). This code will run as a daemon and is effectively like calling the python script every minute using a cron, but without requiring that to be set up by the user.
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`date` command on OS X doesn't have ISO 8601 `-I` option?
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It's not a feature of Bash, it's a feature of the date binary. On Linux you would typically have the GNU coreutils version of date, whereas on OSX you would have the BSD legacy utilities. The GNU version can certainly be installed as an optional package, or you can roll your own replacement...
dd: How to calculate optimal blocksize? [closed]
...us hardware buses and disks involved. Several Unix-like systems (including Linux and at least some flavors of BSD) define the st_blksize member in the struct stat that gives what the kernel thinks is the optimal block size:
#include <sys/stat.h>
#include <stdio.h>
int main(void)
{
...