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The modulo operation on negative numbers in Python
...
Unlike C or C++, Python's modulo operator (%) always return a number having the same sign as the denominator (divisor). Your expression yields 3 because
(-5) / 4 = -1.25 --> floor(-1.25) = -2
(-5) % 4 = (-2 × 4 + 3) % 4 = 3.
It is chosen over t...
How to prevent http file caching in Apache httpd (MAMP)
...pd.conf)
<filesMatch "\.(html|htm|js|css)$">
FileETag None
<ifModule mod_headers.c>
Header unset ETag
Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
Header set Pragma "no-cache"
Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
</i...
How to avoid circular imports in Python? [duplicate]
...
Only import the module, don't import from the module:
Consider a.py:
import b
class A:
def bar(self):
return b.B()
and b.py:
import a
class B:
def bar(self):
return a.A()
This works perfectly fine.
...
How to do relative imports in Python?
... than just answering the question.
The problem is that you're running the module as '__main__' by passing the mod1.py as an argument to the interpreter.
From PEP 328:
Relative imports use a module's __name__ attribute to determine that module's position in the package hierarchy. If the module'...
Modular multiplicative inverse function in Python
Does some standard Python module contain a function to compute modular multiplicative inverse of a number, i.e. a number y = invmod(x, p) such that x*y == 1 (mod p) ? Google doesn't seem to give any good hints on this.
...
Adding days to $Date in PHP
...
From PHP 5.2 on you can use modify with a DateTime object:
http://php.net/manual/en/datetime.modify.php
$Date1 = '2010-09-17';
$date = new DateTime($Date1);
$date->modify('+1 day');
$Date2 = $date->format('Y-m-d');
Be careful when adding month...
Seedable JavaScript random number generator
... returns in range [start, end): including start, excluding end
// can't modulu nextInt because of weak randomness in lower bits
var rangeSize = end - start;
var randomUnder1 = this.nextInt() / this.m;
return start + Math.floor(randomUnder1 * rangeSize);
}
RNG.prototype.choice = functio...
程序员之网络安全系列（四）：数据加密之非对称秘钥 - 更多技术 - 清泛网 -...
...钥，然后让隔壁的王叔叔帮忙交换公开秘钥。
YA=a^XA mod p=5^36 mod 97=50
YB=a^XB mod p=5^58 mod 97=44
明明和丽丽交换了公开密钥之后，计算共享密钥如下：
明明：K=(YB) ^XA mod p=44^36 mod 97=75
丽丽：K=(YA) ^XB mod p=50^58 mod...
那些微信公众大号是如何赚钱的？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...粉丝的需求和建议下开的，主要根据粉丝的需求设计定制服装、饰品等，淘宝店更新信息都会放入公众号文章中。
微信公众号界的明星大号“石榴婆报告”也是在一次偶然中发现公众号的商业价值。运营者程艳曾在文末推送一...
Use RSA private key to generate public key?
...ey:
RSAPrivateKey ::= SEQUENCE {
version Version,
modulus INTEGER, -- n
publicExponent INTEGER, -- e
privateExponent INTEGER, -- d
prime1 INTEGER, -- p
prime2 INTEGER, -- q
exponent1 INTEGER, --...