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Hash and salt passwords in C#
...*
* Version 3:
* PBKDF2 with HMAC-SHA256, 128-bit salt, 256-bit subkey, 10000 iterations.
* Format: { 0x01, prf (UInt32), iter count (UInt32), salt length (UInt32), salt, subkey }
* (All UInt32s are stored big-endian.)
*/
public string HashPassword(string password)
{
var prf = KeyDerivati...
Progress indicator during pandas operations
...t tqdm # for notebooks
df = pd.DataFrame(np.random.randint(0, int(1e8), (10000, 1000)))
# Create and register a new `tqdm` instance with `pandas`
# (can use tqdm_gui, optional kwargs, etc.)
tqdm.pandas()
# Now you can use `progress_apply` instead of `apply`
df.groupby(0).progress_apply(lambda x:...
What are the performance characteristics of sqlite with very large database files? [closed]
...
Yes, inserts were done in batches of 10000 messages per transaction.
– Snazzer
May 14 '09 at 15:17
6
...
How do I provide JVM arguments to VisualVM?
...verview>JVM includes: -Xms24m -Xmx192m -Dsun.jvmstat.perdata.syncWaitMs=10000 -Xms256m -Xmx1024m
– Kevin Welker
Mar 5 '12 at 18:52
...
Why can't I use a list as a dict key in python?
... l in lists_list
25.5 µs ± 442 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
>>> %timeit s in stupidlists_set
38.5 µs ± 61.2 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)
>>> %timeit t in tuples_set
77.6 ns ± 1.5 ns per loop (mean ± std. dev. of 7 ...
Getting key with maximum value in dictionary?
...gt;>> timeit.timeit("f1()","from __main__ import f1, f7, d1", number=10000) 0.26785888786807277 >>> timeit.timeit("f7()","from __main__ import f1, f7, d1", number=10000) 0.26770628307832567
– Reinstate Monica
Nov 21 '12 at 21:47
...
Calculate difference in keys contained in two Python dictionaries
...ctB = dict(zip(range(0,2000,2),range(1000)))" "diff=set(dictB)-set(dictA)"
10000 loops, best of 3: 107 usec per loop
diff = [ k for k in dictB if k not in dictA ] #lc
C:\Dokumente und Einstellungen\thc>python -m timeit -s "dictA =
dict(zip(range(1000),range
(1000))); dictB = dict(zip(range(0,2...
java get file size efficiently
...eration___16.0
channel sum__273.0, per Iteration__273.0
For 100 runs and 10000 iterations I get:
file sum__1767629.0, per Iteration__1.7676290000000001
raf sum___881284.0, per Iteration__0.8812840000000001
channel sum___414286.0, per Iteration__0.414286
I did run the following modified ...
How to use the CancellationToken property?
...TokenSource();
Task.Factory.StartNew(async () => {
await Task.Delay(10000);
// call web API
}, cancelToken.Token);
//this stops the Task:
cancelToken.Cancel(false);
Anther solution is user Timer in Xamarin.Forms, stop timer when app goto background
https://xamarinhelp.com/xamarin-forms...
How do I detect unsigned integer multiply overflow?
...
according to your multiplication_is_safe 0x8000 * 0x10000 would overflow (bit positions are 16 + 17 = 33 which is > 32), although it doesn't because 0x8000 * 0x10000 = 0x80000000 which obviously still fits into a unsigned 32 bit int. This is just one out of may examples for...