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Resetting generator object in Python
...to create a second version of your generator:
y = FunctionWithYield()
y, y_backup = tee(y)
for x in y:
print(x)
for x in y_backup:
print(x)
This could be beneficial from memory usage point of view if the original iteration might not process all the items.
...
How to find gaps in sequential numbering in mysql?
...rks on table of any size (not just on 100 rows):
SELECT (t1.id + 1) as gap_starts_at,
(SELECT MIN(t3.id) -1 FROM arrc_vouchers t3 WHERE t3.id > t1.id) as gap_ends_at
FROM arrc_vouchers t1
WHERE NOT EXISTS (SELECT t2.id FROM arrc_vouchers t2 WHERE t2.id = t1.id + 1)
HAVING gap_ends_at IS ...
What characters are allowed in DOM IDs? [duplicate]
...ype ID MUST match the Name production.
NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] |
[#xD8-#xF6] | [#xF8-#x2FF] |
[#x370-#x37D] | [#x37F-#x1FFF] |
[#x200C-#x200D] | [#x2070-#x218F] |
...
.NET Process.Start default directory?
...\system32.
You can determine the value of %SYSTEMROOT% by using:
string _systemRoot = Environment.GetEnvironmentVariable("SYSTEMROOT");
Here is some sample code that opens Notepad.exe with a working directory of %ProgramFiles%:
...
using System.Diagnostics;
...
ProcessStartInfo _processStar...
How to set the JDK Netbeans runs on?
I have older NB6.7, NB6.9, NB7.0, which used to run on jdk1.6.0_21 and jdk1.6.0_25. Now I've removed those JDKs and only have jdk1.6.0_26 and jdk1.7.0 left, but I still want to keep the older NBs, but now when I run them, I get this message:
...
No output to console from a WPF application?
...ity]
public static class ConsoleManager
{
private const string Kernel32_DllName = "kernel32.dll";
[DllImport(Kernel32_DllName)]
private static extern bool AllocConsole();
[DllImport(Kernel32_DllName)]
private static extern bool FreeConsole();
[DllImport(Kernel32_DllName)]
...
Resolving ambiguous overload on function pointer and std::function for a lambda using +
...in comp.lang.c++.moderated if a closure type could add a typedef for result_type and the other typedefs required to make them adaptable (for instance by std::not1). I was told that it could not because this was observable. I'll try to find the link.
– Cassio Neri
...
open read and close a file in 1 line of code
...athlib module does what you looking for:
Path('pagehead.section.htm').read_text()
Don't forget to import Path:
jsk@dev1:~$ python3
Python 3.5.2 (default, Sep 10 2016, 08:21:44)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from ...
What's the canonical way to check for type in Python?
...
str.__subclasses__() only returns the direct subclasses of str, and does not do the same thing as issubclass() or isinstance(). (To do that, you would have to recursively call .__subclasses__().
– Thomas Wou...
how to mysqldump remote db from local machine
...ser@remote.server -N
And change:
mysqldump -P 3310 -h localhost -u mysql_user -p database_name table_name
To:
mysqldump -P 3310 -h 127.0.0.1 -u mysql_user -p database_name table_name
(do not use localhost, it's one of these 'special meaning' nonsense that probably connects by socket rather ...