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Random alpha-numeric string in JavaScript? [duplicate]
...y unique.
Even assuming an ideal implementation, the output has at most 52 bits of entropy, which means you can expect a duplicate after around 70M strings generated.
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How can I force Powershell to return an array when a call only returns one object?
...to set up IIS bindings on a web server, and having a problem with the following code:
7 Answers
...
Quick and easy file dialog in Python?
... only the dialog without any other GUI elements, you have to hide the root window using the withdraw method:
import tkinter as tk
from tkinter import filedialog
root = tk.Tk()
root.withdraw()
file_path = filedialog.askopenfilename()
Python 2 variant:
import Tkinter, tkFileDialog
root = Tkinte...
浅谈TCP优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...小，也就是说最大值是64KB，如果超过它，就需要使用tcp_window_scaling机制。参考：TCP Windows and Window Scaling。
Linux中通过配置内核参数里接收缓冲的大小，进而可以控制接收窗口的大小：
shell> sysctl -a | grep mem
net.ipv4.tcp_rmem = <MIN>...
How do I determine the size of an object in Python?
...ell as numbers, strings and other objects.
A More Complete Answer
Using 64-bit Python 3.6 from the Anaconda distribution, with sys.getsizeof, I have determined the minimum size of the following objects, and note that sets and dicts preallocate space so empty ones don't grow again until after a set a...
UnicodeDecodeError, invalid continuation byte
...e and there is no char corresponding to your combination of \xe9 plus following space.
Why should it succeed in both utf-8 and latin-1?
Here how the same sentence should be in utf-8:
>>> o.decode('latin-1').encode("utf-8")
'a test of \xc3\xa9 char'
...
print call stack in C or C++
...16.04, GCC 6.4.0, libc 2.23.
glibc backtrace_symbols_fd
This helper is a bit more convenient than backtrace_symbols, and produces basically identical output:
/* Paste this on the file you want to debug. */
#include <execinfo.h>
#include <stdio.h>
#include <unistd.h>
void print_t...
Efficient way to determine number of digits in an integer
...
}
return digits;
}
// partial specialization optimization for 32-bit numbers
template<>
int numDigits(int32_t x)
{
if (x == MIN_INT) return 10 + 1;
if (x < 0) return numDigits(-x) + 1;
if (x >= 10000) {
if (x >= 10000000) {
if (x >= 100000...
Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...nnected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADD...
How to develop and test an app that sends emails (without filling someone's mailbox with test data)?
...e problem a few weeks ago and wrote this: http://smtp4dev.codeplex.com
Windows 7/Vista/XP/2003/2010 compatible dummy SMTP server. Sits in the system tray and does not deliver the received messages. The received messages can be quickly viewed, saved and the source/structure inspected. Useful for ...