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If table exists drop table then create it, if it does not exist just create it
...e and swap it with an old one (table contents are lost):
CREATE TABLE `bla__new` (id int); /* if not ok: terminate, report error */
RENAME TABLE `bla__new` to `bla`; /* if ok: terminate, report success */
RENAME TABLE `bla` to `bla__old`, `bla__new` to `bla`;
DROP TABLE IF EXISTS `bla__old`;
You...
PATH issue with pytest 'ImportError: No module named YadaYadaYada'
I used easy_install to install pytest on a mac and started writing tests for a project with a file structure likes so:
20 A...
How to implement a good __hash__ function in python [duplicate]
...
__hash__ should return the same value for objects that are equal. It also shouldn't change over the lifetime of the object; generally you only implement it for immutable objects.
A trivial implementation would be to just ret...
Input from the keyboard in command line application
...or how I set it up.
Usage from swift
let prompt: Prompt = Prompt(argv0: C_ARGV[0])
while (true) {
if let line = prompt.gets() {
print("You typed \(line)")
}
}
ObjC wrapper to expose libedit
#import <histedit.h>
char* prompt(EditLine *e) {
return "> ";
}
@implemen...
Check if a class has a member function of a given signature
...compile-time. Example from my code (tests if class has member function size_t used_memory() const).
template<typename T>
struct HasUsedMemoryMethod
{
template<typename U, size_t (U::*)() const> struct SFINAE {};
template<typename U> static char Test(SFINAE<U, &U::us...
getenv() vs. $_ENV in PHP
What is the difference between getenv() and $_ENV ?
6 Answers
6
...
How to Calculate Execution Time of a Code Snippet in C++
...inux it is implementation dependent, but it usually 15 ms as well.
#ifdef _WIN32
#include <Windows.h>
#else
#include <sys/time.h>
#include <ctime>
#endif
/* Remove if already defined */
typedef long long int64; typedef unsigned long long uint64;
/* Returns the amount of millisec...
How to identify numpy types in python?
...
Use the builtin type function to get the type, then you can use the __module__ property to find out where it was defined:
>>> import numpy as np
a = np.array([1, 2, 3])
>>> type(a)
<type 'numpy.ndarray'>
>>> type(a).__module__
'numpy'
>>> type(a).__m...
Python: Bind an Unbound Method?
...
All functions are also descriptors, so you can bind them by calling their __get__ method:
bound_handler = handler.__get__(self, MyWidget)
Here's R. Hettinger's excellent guide to descriptors.
As a self-contained example pulled from Keith's comment:
def bind(instance, func, as_name=None):
...
Should you always favor xrange() over range()?
...kipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: ws_comma
--- range_test.py (original)
+++ range_test.py (refactored)
@@ -1,7 +1,7 @@
for x in range(20):
- a=range(20)
+ a=list(range(20))
b=list(range(20))
c=[x for x in range(20)]
d=(x for x in range(20...