大约有 14,100 项符合查询结果（耗时：0.0251秒） [XML]
#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 ...
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...
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
...
How to tell whether a point is to the right or left side of a line
...
Use the sign of the determinant of vectors (AB,AM), where M(X,Y) is the query point:
position = sign((Bx - Ax) * (Y - Ay) - (By - Ay) * (X - Ax))
It is 0 on the line, and +1 on one side, -1 on the other side.
...
How to put a unicode character in XAML?
...
Since XAML is an XML file format you could try the XML character escape. So instead of writing &\u2014, you could write — instead.
share
...
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...
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...
curl -GET and -X GET
Curl offers a series of different http method calls that are prefixed with a X, but also offers the same methods without. I've tried both and I can't seem to figure out the difference. Can someone explain to me quickly how these two operations differ?
...
How do I sort strings alphabetically while accounting for value when a string is numeric?
..., "lauren", "007", "90", "101"};
foreach (var thing in things.OrderBy(x => x, new SemiNumericComparer()))
{
Console.WriteLine(thing);
}
}
public class SemiNumericComparer: IComparer<string>
{
/// <summary>
/// Method to determine if a string is a num...