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How to pattern match using regular expression in Scala?
...ter match {
case Pattern(c) => c bound to capture group here
case _ =>
}
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Why use String.Format? [duplicate]
...ing s = string.Format("Hey, {0} it is the {1}st day of {2}. I feel {3}!", _name, _day, _month, _feeling);
vs:
string s = "Hey," + _name + " it is the " + _day + "st day of " + _month + ". I feel " + feeling + "!";
Format Specifiers
(and this includes the fact you can write custom formatters)
...
Nested defaultdict of defaultdict
...
For an arbitrary number of levels:
def rec_dd():
return defaultdict(rec_dd)
>>> x = rec_dd()
>>> x['a']['b']['c']['d']
defaultdict(<function rec_dd at 0x7f0dcef81500>, {})
>>> print json.dumps(x)
{"a": {"b": {"c": {"d": {}}}}}
...
Convert string to Python class object?
...; class Foo(object):
... pass
...
>>> eval("Foo")
<class '__main__.Foo'>
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AttributeError: 'module' object has no attribute 'tests'
... Instead of fearing use of the "death star" can't you juse use the __all__ variable in each file? And specify a list of class names, functions, and variables to export when using from package_name.module import *? I've had good luck with this pattern. I understand it takes a bit more time...
Get the latest record from mongodb collection
...answered Feb 2 '14 at 21:28
dark_rubydark_ruby
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How to know if two arrays have the same values
...
function arraysEqual(_arr1, _arr2) {
if (!Array.isArray(_arr1) || ! Array.isArray(_arr2) || _arr1.length !== _arr2.length)
return false;
var arr1 = _arr1.concat().sort();
var arr2 = _arr2.concat().sort();
for (var i = 0; ...
Python logging: use milliseconds in time format
.... This can not be fixed by specifying a datefmt because ct is a time.struct_time and these objects do not record milliseconds.
If we change the definition of ct to make it a datetime object instead of a struct_time, then (at least with modern versions of Python) we can call ct.strftime and then we...
Linux command or script counting duplicated lines in a text file?
...3
}
or you can use a simple one-liner:
$ cat filename | python3 -c 'print(__import__("json").dumps(__import__("collections").Counter(map(str.strip, __import__("fileinput").input())), indent=2))'
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How can I hash a password in Java?
...m recommended cost, used by default
*/
public static final int DEFAULT_COST = 16;
private static final String ALGORITHM = "PBKDF2WithHmacSHA1";
private static final int SIZE = 128;
private static final Pattern layout = Pattern.compile("\\$31\\$(\\d\\d?)\\$(.{43})");
private final Se...