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How can I check if a string represents an int, without using try/except?
...
You have to test for BOTH cases: lambda s: s.isdigit() or (s.startswith('-') and s[1:].isdigit())
– rob
Aug 12 '09 at 13:39
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On design patterns: When should I use the singleton?
... A print spooler does not meet the criteria. You may want a test print spooler that doesn't actually print, for testing.
– user253751
Jul 1 at 15:09
add a comme...
Java Map equivalent in C#
...","world");
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Console.Writeline(example["hello"]);
An efficient way to test/get values is TryGetValue (thanx to Earwicker):
if (otherExample.TryGetValue("key", out value))
{
otherExample["key"] = value + 1;
}
With this method you can fast and exception-less get values (if present).
Reso...
class
...a single object.
Example:
class SomeClass
class << self
def test
end
end
end
test_obj = SomeClass.new
def test_obj.test_2
end
class << test_obj
def test_3
end
end
puts "Singleton's methods of SomeClass"
puts SomeClass.singleton_methods
puts '-----------------------...
How to overwrite the previous print to stdout in python?
... erasing prior output on that line, for instance: if your first loop print testing and your second loop print test the output after the second pass will still be testing - now I see that @Nagasaki45 pointed this out
– Eric Uldall
Jun 24 '15 at 21:35
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differentiate null=True, blank=True in django
...null=True because it allows two different kinds of "blanky" values. I just tested this behaviour with Django 1.8/MySQL 5.6
– Edward D'Souza
Aug 3 '16 at 17:14
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How can I resize an image dynamically with CSS as the browser width/height changes?
...t;
</div>
JSFiddle example here. No JavaScript required. Works in latest versions of Chrome, Firefox and IE (which is all I've tested).
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How do I invoke a Java method when given the method name as a string?
...mport java.lang.reflect.Method;
import org.junit.Assert;
import org.junit.Test;
public class ReflectionTest {
private String methodName = "length";
private String valueObject = "Some object";
@Test
public void testGetMethod() throws SecurityException, NoSuchMethodException, Illeg...
How can I enable or disable the GPS programmatically on Android?
....parse("3"));
sendBroadcast(poke);
}
}
use the following to test if the existing version of the power control widget is one which will allow you to toggle the gps.
private boolean canToggleGPS() {
PackageManager pacman = getPackageManager();
PackageInfo pacInfo = null;
t...
Split string with delimiters in C
...a parentheses are a stylistic element to indicate that we're intentionally testing the result of an assignment, not an equality operator ==.
For that pattern to work, token and str both have type char *. If you started with a string literal, then you'd want to make a copy of it first:
// More gene...