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How to make an immutable object in Python?
...ter(1))
p = Point(2, 3)
p.x
# 2
p.y
# 3
Edit: If you want to get rid of indexing either, you can override __getitem__():
class Point(tuple):
__slots__ = []
def __new__(cls, x, y):
return tuple.__new__(cls, (x, y))
@property
def x(self):
return tuple.__getitem__(se...
How to reshape data from long to wide format
...ear "value" column. Try dat <- data.frame(id=c(1,1,2,2),blah=c(8,4,7,6),index=c(1,2,1,2)); dcast(dat, id ~ index); cast(dat, id ~ index) and you will not get what you expect. You need to explicitly note the value/value.var - cast(dat, id ~ index, value="blah") and dcast(dat, id ~ index, value.var...
C++ equivalent of java's instanceof
...ceOfMacros.h
#include <set>
#include <tuple>
#include <typeindex>
#define _EMPTY_BASE_TYPE_DECL() using BaseTypes = std::tuple<>;
#define _BASE_TYPE_DECL(Class, BaseClass) \
using BaseTypes = decltype(std::tuple_cat(std::tuple<BaseClass>(), Class::BaseTypes()));
#de...
Fatal error: Maximum execution time of 300 seconds exceeded
... This line of code will drop the max execution time restriction of a code, allowing a php code to run forever (theoretically).
– Technotronic
May 20 '15 at 13:09
2
...
Remove last character from string. Swift language
...opLast()) // "Hello, Worl"
str.remove(at: str.index(before: str.endIndex)) // "d"
str // "Hello, Worl" (modifying)
Swift 3.0
The APIs have gotten a bit more swifty, and as a result the Foundation extension has changed ...
Can't pickle when using multiprocessing Pool.map()
...f __del__(self):
print "... Destructor"
def process_obj(self, index):
print "object %d" % index
return "results"
pickle(MethodType, _pickle_method, _unpickle_method)
Myclass(nobj=8, workers=3)
# problem !!! the destructor is called nobj times (instead of once)
Output:...
Run a PHP file in a cron job using CPanel
... What will be full command? I mean full command in one line with all options.
– Auj
Jul 5 '16 at 22:59
@Somy...
Find running median from a stream of integers
... elements to all be stored in memory). See below for another answer using indexable skiplists that only requires the most recently seen 100 elements be kept in memory.
– Raymond Hettinger
May 22 '12 at 5:42
...
PHP 5: const vs static
...nd private are irrelevant in terms of consts" - Why? Are consts by default all public? all private?
– Chris Jacob
Nov 8 '09 at 22:24
1
...
What is the etymology of 'slug'? [closed]
... from meaning #1 in the other answer. See also the dates in etymonline.com/index.php?term=slug
– Walter Tross
Jan 1 '16 at 11:36
...