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Nested or Inner Class in PHP
...* simulating protected InnerClasses
*/
protected function __construct() {}
/* This magic method is called everytime an inaccessible method is called
* (either by visibility contrains or it doesn't exist)
* Here we are simulating shared protected methods a...
Create singleton using GCD's dispatch_once in Objective-C
...er here: instancetype
+ (instancetype)sharedInstance
{
static dispatch_once_t once;
static id sharedInstance;
dispatch_once(&once, ^
{
sharedInstance = [self new];
});
return sharedInstance;
}
+ (Class*)sharedInstance
{
static dispatch_once_t once;
...
Django dynamic model fields
...ister(Patient)
Attribute.objects.create(name='age', datatype=Attribute.TYPE_INT)
Attribute.objects.create(name='height', datatype=Attribute.TYPE_FLOAT)
Attribute.objects.create(name='weight', datatype=Attribute.TYPE_FLOAT)
Attribute.objects.create(name='city', datatype=Attribute.TYPE_TEXT)
Attribute...
Merge PDF files
...pt ImportError:
from pyPdf import PdfFileReader, PdfFileWriter
def pdf_cat(input_files, output_stream):
input_streams = []
try:
# First open all the files, then produce the output file, and
# finally close the input files. This is necessary because
# the data isn...
PyLint “Unable to import” error - how to set PYTHONPATH?
...le works better for me:
[MASTER]
init-hook="from pylint.config import find_pylintrc; import os, sys; sys.path.append(os.path.dirname(find_pylintrc()))"
Note that pylint.config.PYLINTRC also exists and has the same value as find_pylintrc().
...
What is the difference between join and merge in Pandas?
...andas as pd
left = pd.DataFrame({'key': ['foo', 'bar'], 'val': [1, 2]}).set_index('key')
right = pd.DataFrame({'key': ['foo', 'bar'], 'val': [4, 5]}).set_index('key')
left.join(right, lsuffix='_l', rsuffix='_r')
val_l val_r
key
foo 1 4
bar 2 5
The same functi...
Arduino 101 实验12 - 录音与回放 · App Inventor 2 中文网
...填数字即可，别去找第二个插座。
固件：.ino 里把 SOUND_RECORDER 设为 ENABLED，其余 DISABLED。
音质期望值放低：录的是单声道低采样率音频，存在板子有限的内存里，
只能录几秒，回放是明显的”电子音”。这个实验的意义是...
When should I use nil and NULL in Objective-C?
...ntions this, but if you dig into objc.h, you'll find the line #define nill __DARWIN_NULL.
– gkb0986
Oct 25 '13 at 3:12
1
...
How do I read any request header in PHP
...instead of all headers, the quickest method is:
<?php
// Replace XXXXXX_XXXX with the name of the header you need in UPPERCASE (and with '-' replaced by '_')
$headerStringValue = $_SERVER['HTTP_XXXXXX_XXXX'];
ELSE IF: you run PHP as an Apache module or, as of PHP 5.4, using FastCGI (simple me...
How to step through Python code to help debug issues?
...rSummoner, pudb is great for that. Also pydev
– alpha_989
Jun 11 '18 at 19:45
pdb is not a command line tool. To use i...