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How to profile a bash shell script slow startup?
...like to begin a trace in any Bash script):
PS4='+ $(date "+%s.%N")\011 '
exec 3>&2 2>/tmp/bashstart.$$.log
set -x
add
set +x
exec 2>&3 3>&-
at the end of ~/.bashrc (or at the end of the section of any Bash script you'd like tracing to stop). The \011 is an octal tab cha...
How to optimize for-comprehensions and loops in Scala?
...he problem in this particular case is that you return from within the for-expression. That in turn gets translated into a throw of a NonLocalReturnException, which is caught at the enclosing method. The optimizer can eliminate the foreach but cannot yet eliminate the throw/catch. And throw/catch is ...
Can't install PIL after Mac OS X 10.9
...
Following worked for me:
ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers/X11 /usr/local/include/X11
sudo pip install pil
UPDATE:
But there is more cor...
Get operating system info
...
The code below could explain in its own right, how http://thismachine.info/ is able to show which operating system someone is using.
What it does is that, it sniffs your core operating system model, for example windows nt 5.1 as my own.
It then ...
#define macro for debug printing in C?
... you use a C89 compiler
If you are stuck with C89 and no useful compiler extension, then there isn't a particularly clean way to handle it. The technique I used to use was:
#define TRACE(x) do { if (DEBUG) dbg_printf x; } while (0)
And then, in the code, write:
TRACE(("message %d\n", var));
...
How to determine whether a Pandas Column contains a particular value
...n a Pandas column that has a particular value. I tried to do this with if x in df['id'] . I thought this was working, except when I fed it a value that I knew was not in the column 43 in df['id'] it still returned True . When I subset to a data frame only containing entries matching the missing ...
psycopg2: insert multiple rows with one query
...ltiple rows with one query (number of rows is not constant), so I need to execute query like this one:
15 Answers
...
What is the most efficient string concatenation method in python?
...is worth remembering also that this is an old article and it predates the existence of things like ''.join (although I guess string.joinfields is more-or-less the same)
On the strength of that, the array module may be fastest if you can shoehorn your problem into it. But ''.join is probably fast e...
Format / Suppress Scientific Notation from Python Pandas Aggregation Results
... converter like so.
In [25]: pd.set_option('display.float_format', lambda x: '%.3f' % x)
In [28]: Series(np.random.randn(3))*1000000000
Out[28]:
0 -757322420.605
1 -1436160588.997
2 -1235116117.064
dtype: float64
I'm not sure if that's the preferred way to do this, but it works.
Convert...
Set icon for Android application
...lude a 48dp sized icon:
drawable-ldpi (120 dpi, Low density screen) - 36px x 36px
drawable-mdpi (160 dpi, Medium density screen) - 48px x 48px
drawable-hdpi (240 dpi, High density screen) - 72px x 72px
drawable-xhdpi (320 dpi, Extra-high density screen) - 96px x 96px
drawable-xxhdpi (480 dpi, Extr...