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Converting from a string to boolean in Python?
...ly', 'uh-huh']
Be cautious when using the following:
>>> bool("foo")
True
>>> bool("")
False
Empty strings evaluate to False, but everything else evaluates to True. So this should not be used for any kind of parsing purposes.
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What's the nearest substitute for a function pointer in Java?
...want to create more methods that do exactly the same thing, except for a small calculation that's going to change one line of code. This is a perfect application for passing in a function pointer to replace that one line, but Java doesn't have function pointers. What's my best alternative?
...
How can I modify the size of column in a MySQL table?
...tomatically converts it to a MEDIUMTEXT data type.
mysql> create table foo (str varchar(300));
mysql> alter table foo modify str varchar(65536);
mysql> show create table foo;
CREATE TABLE `foo` (
`str` mediumtext
) ENGINE=MyISAM DEFAULT CHARSET=latin1
1 row in set (0.00 sec)
I misread ...
初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...据：
INSERT INTO `users` (`username`, `password`, `email`)
VALUES
('foo', 'ffffffffffffffffffffffffffffffff', 'foo@domain.com'),
('bar', 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb', 'bar@domain.com');
接着在containers里配置这个表：
INSERT INTO innodb_memcache.containers (
name, db_...
How to remove all white space from the beginning or end of a string?
How can I remove all white space from the beginning and end of a string?
6 Answers
6
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Why can't Python's raw string literals end with a single backslash?
Technically, any odd number of backslashes, as described in the documentation .
12 Answers
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Creating an empty file in Ruby: “touch” equivalent?
...
If you are worried about file handles:
File.open("foo.txt", "w") {}
From the docs:
If the optional code block is given, it will be passed the opened file
as an argument, and the File object will automatically be closed when
the block terminates.
...
The constant cannot be marked static
...n the referenced assembly changes, your assembly will still have the originally compiled-in value.
If this behavior is not acceptable, then you should consider making the field a public static readonly field.
Lib.dll, provided as binary:
public class Foo {
public const int HATS = 42;
publ...
What is the 'pythonic' equivalent to the 'fold' function from functional programming?
...(xs):
return reduce(operator.mul, xs, 1)
Be aware that reduce is actually a foldl, in Haskell terms. There is no special syntax to perform folds, there's no builtin foldr, and actually using reduce with non-associative operators is considered bad style.
Using higher-order functions is quite p...
how perform grep operation on all files in a directory
...
grep $PATTERN * would be sufficient. By default, grep would skip all subdirectories. However, if you want to grep through them, grep -r $PATTERN * is the case.
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