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How to implement a good __hash__ function in python [duplicate]
...more expensive than it needs to be.
Edit: I would recommend against using xor to mix hashes in general. When two different properties have the same value, they will have the same hash, and with xor these will cancel eachother out. Tuples use a more complex calculation to mix hashes, see tuplehash i...
&& (AND) and || (OR) in IF statements
... or; ((A?1:0) * (B?1:0)) == 1, ((A?1:0) + (B?1:0)) > 0. You can even do xor: ((A?1:0) + (B?1:0)) == 1.
– outis
Nov 27 '09 at 12:19
1
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Two-way encryption: I need to store passwords that can be retrieved
...s to store passwords in encrypted way, I would suggest you to use a simple XOR Cipher. The main problem with this algorithm is that it could be easily broken by frequency analysis. However as generally passwords are not made from long paragraphs of English text I don't think you should worry about i...
What is the advantage of GCC's __builtin_expect in if else statements?
... 83 ec 08 sub $0x8,%rsp
4: 31 ff xor %edi,%edi
6: e8 00 00 00 00 callq b <main+0xb>
7: R_X86_64_PC32 time-0x4
b: 48 85 c0 test %rax,%rax
e: 75 0a jne ...
Is there a standardized method to swap two variables in Python?
...w three ways to swap variables, but a, b = b, a is the simplest. There is
XOR (for integers)
x = x ^ y
y = y ^ x
x = x ^ y
Or concisely,
x ^= y
y ^= x
x ^= y
Temporary variable
w = x
x = y
y = w
del w
Tuple swap
x, y = y, x
...
How do function pointers in C work?
... mov ebx,DWORD PTR [ebx]
c: 31 c3 xor ebx,eax # pointless xor-swap
e: 31 d8 xor eax,ebx # instead of just storing with opposite registers
10: 31 c3 xor ebx,eax
12: 8b 4c 2...
SEH stack 结构探索（1）--- 从 SEH 链的最底层（线程第1个SEH结构）说起 -...
...word ptr [ntdll32!__security_cookie (77822088)]
7774dd46 3145fc xor dword ptr [ebp-4],eax
7774dd49 33c5 xor eax,ebp
7774dd4b 50 push eax
7774dd4c 8965e8 mov dword ptr [ebp-18h],esp
7774dd4f ff75f8 push dword ptr [ebp-8]
...
What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
...k I see it. That seems to interact rather oddly with my definition of the Xor type… I'll have to think about that. Thanks!
– Antal Spector-Zabusky
Jun 3 '10 at 22:54
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Python argparse: Make at least one argument required
...
I think he wants to allow --process OR --upload, not XOR. This prevents both options from being set at the same time.
– phihag
Jul 17 '11 at 9:54
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Fastest hash for non-cryptographic uses?
...33be207f14eeab8b
sha1: 0.07331 417a9e5c9ac7c52e32727cfd25da99eca9339a80
xor: 0.65218 119
xor2: 0.29301 134217728
add: 0.57841 1105
And the code used to generate this is:
$loops = 100000;
$str = "ana are mere";
echo "<pre>";
$tss = microtime(true);
for($i=0; $i<$loop...