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How to take the first N items from a generator or list in Python? [duplicate]
With linq I would
8 Answers
8
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Regex lookahead, lookbehind and atomic groups
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Examples
Given the string foobarbarfoo:
bar(?=bar) finds the 1st bar ("bar" which has "bar" after it)
bar(?!bar) finds the 2nd bar ("bar" which does not have "bar" after it)
(?<=foo)bar finds the 1st bar ("bar" which has "foo" before it...
Is pass-by-value a reasonable default in C++11?
...let the compiler do the copying.
In code this means don't do this:
void foo(T const& t)
{
auto copy = t;
// ...
}
but do this:
void foo(T t)
{
// ...
}
which has the advantage that the caller can use foo like so:
T lval;
foo(lval); // copy from lvalue
foo(T {}); // (potentia...
Differences between Perl and PHP [closed]
...perators return their arguments, while they return booleans in PHP. Try:
$foo = '' || 'bar';
in each language. In Perl, you can even do $foo ||= 'default' to set $foo to a value if it's not already set. The shortest way of doing this in PHP is $foo = isset($foo) ? $foo : 'default'; (Update, in PH...
Any way to Invoke a private method?
...e Manifold's @Jailbreak for direct, type-safe Java reflection:
@Jailbreak Foo foo = new Foo();
foo.callMe();
public class Foo {
private void callMe();
}
@Jailbreak unlocks the foo local variable in the compiler for direct access to all the members in Foo's hierarchy.
Similarly you can use t...
Insert a string at a specific index
...lice(0, idx) + str + this.slice(idx + Math.abs(rem));
};
var result = "foo baz".splice(4, 0, "bar ");
document.body.innerHTML = result; // "foo bar baz"
EDIT: Modified it to ensure that rem is an absolute value.
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How to check the version before installing a package using apt-get?
I'm thinking to install hylafax+ version 5.5.4 which was release last month on my Debian PC.
10 Answers
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What does immutable mean?
... you can't change its properties. In your first alert you aren't changing foo. You're creating a new string. This is why in your second alert it will show "foo" instead of oo.
Does it mean, when calling methods on
a string, it will return the modified
string, but it won't change the
ini...
How do I add custom field to Python log format string?
...f:
>>> import logging
>>> logging.basicConfig(format="%(foo)s - %(message)s")
>>> logging.warning('test', extra={'foo': 'bar'})
bar - test
Also, as a note, if you try to log a message without passing the dict, then it will fail.
>>> logging.warning('test')
Tr...
UITableViewCell subview disappears when cell is selected
I'm implementing a color-chooser table view where the user can select amongst, say, 10 colors (depends on the product). The user can also select other options (like hard drive capacity, ...).
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