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super() raises “TypeError: must be type, not classobj” for new-style class
...pe(OldStyle()) is the instance type, which does inherit from object. Basically, an old-style class just creates objects of type instance (whereas a new-style class creates objects whose type is the class itself). This is probably why the instance OldStyle() is an object: its type() inherits from ob...
How do I find out if first character of a string is a number?
...0-9. You might prefer:
char c = string.charAt(0);
isDigit = (c >= '0' && c <= '9');
Or the slower regex solutions:
s.substring(0, 1).matches("\\d")
// or the equivalent
s.substring(0, 1).matches("[0-9]")
However, with any of these methods, you must first be sure that the string i...
How do I delete rows in a data frame?
I have a data frame named "mydata" that looks like this this:
8 Answers
8
...
Android: AutoCompleteTextView show suggestions when no text entered
...usChanged(focused, direction, previouslyFocusedRect);
if (focused && getAdapter() != null) {
performFiltering(getText(), 0);
}
}
}
Use it in your xml like this:
<your.namespace.InstantAutoComplete ... />
...
What is the difference between _tmain() and main() in C++?
...Now, in UTF-16, the character set used by Windows when Unicode is enabled, all the ASCII characters are represented as the pair of bytes \0 followed by the ASCII value.
And since the x86 CPU is little-endian, the order of these bytes are swapped, so that the ASCII value comes first, then followed b...
How to make a cross-module variable?
...as if a global from any other module that includes __builtin__ -- which is all of them, by default.
a.py contains
print foo
b.py contains
import __builtin__
__builtin__.foo = 1
import a
The result is that "1" is printed.
Edit: The __builtin__ module is available as the local symbol __builtin...
Truncate Two decimal places without rounding
...te decimals)
{
decimal r = Math.Round(d, decimals);
if (d > 0 && r > d)
{
return r - new decimal(1, 0, 0, false, decimals);
}
else if (d < 0 && r < d)
{
return r + new decimal(1, 0, 0, false, decimals);
}
return r;
}
...
Reverse colormap in matplotlib
...
The standard colormaps also all have reversed versions. They have the same names with _r tacked on to the end. (Documentation here.)
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How to serve static files in Flask
...ample below, I have moved my templates and static files into a sub-folder called web.
app = Flask(__name__,
static_url_path='',
static_folder='web/static',
template_folder='web/templates')
static_url_path='' removes any preceding path from the URL (i.e.
the d...
Shortest distance between a point and a line segment
...nto the line.
// It falls where t = [(p-v) . (w-v)] / |w-v|^2
// We clamp t from [0,1] to handle points outside the segment vw.
const float t = max(0, min(1, dot(p - v, w - v) / l2));
const vec2 projection = v + t * (w - v); // Projection falls on the segment
return distance(p, projectio...