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What do *args and **kwargs mean? [duplicate]
...ments, no matter how many you supply, you could write it like this:
def my_sum(*args):
return sum(args)
It’s probably more commonly used in object-oriented programming, when you’re overriding a function, and want to call the original function with whatever arguments the user passes in.
Y...
Casting vs using the 'as' keyword in the CLR
...bject obj) cil managed
{
// Code size 22 (0x16)
.maxstack 8
IL_0000: ldarg.1
IL_0001: isinst MyClass
IL_0006: brfalse.s IL_0015
IL_0008: ldarg.1
IL_0009: castclass MyClass
IL_000e: pop
IL_000f: ldarg.1
IL_0010: call void [mscorlib]System.Console::WriteL...
Inserting multiple rows in mysql
...sed within parentheses and separated by commas.
Example:
INSERT INTO tbl_name
(a,b,c)
VALUES
(1,2,3),
(4,5,6),
(7,8,9);
Source
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...
How to do a less than or equal to filter in Django queryset?
...
Less than or equal:
User.objects.filter(userprofile__level__lte=0)
Greater than or equal:
User.objects.filter(userprofile__level__gte=0)
Likewise, lt for less than and gt for greater than. You can find them all in the documentation.
...
Using Django time/date widgets in custom form
... the proper field names from your model):
from django import forms
from my_app.models import Product
from django.contrib.admin import widgets
class ProductForm(forms.ModelForm):
class Meta:
model = Product
def __init__(self, *args, **kwargs):
...
Referring to the null object in Python
...t;> NoneType = type(None)
>>> id(None)
10748000
>>> my_none = NoneType()
>>> id(my_none)
10748000
>>> another_none = NoneType()
>>> id(another_none)
10748000
>>> def function_that_does_nothing(): pass
>>> return_value = function_that_...
How to automatically generate N “distinct” colors?
...uration [0, 100), lightness [0, 100)
for(i = 0; i < 360; i += 360 / num_colors) {
HSLColor c;
c.hue = i;
c.saturation = 90 + randf() * 10;
c.lightness = 50 + randf() * 10;
addColor(c);
}
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Replacing Spaces with Underscores
I have a PHP Script that users will enter a name like: Alex_Newton ,
12 Answers
12
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C++中判断文件、目录是否存在的几种方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
if(fh == NULL)
{
printf("%s","can not open the file");
}
三、_access
当然C中还有一种方式是直接调用c的函数库。
就是函数 int _access(const char* path,int mode);
这个函数的功能十分强大。
可以看看msdn的详细介绍
#include <io.h>
#include ...
phpcms v9内容页/下载页更新时间（updatetime）为空的解决方法 - 更多技术 ...
.../content/content.php
public function add() {
if(isset($_POST['dosubmit']) || isset($_POST['dosubmit_continue'])) {
define('INDEX_HTML',true);
$catid = $_POST['info']['catid'] = intval($_POST['info']['catid']);
...