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join list of lists in python [duplicate]
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504
import itertools
a = [['a','b'], ['c']]
print(list(itertools.chain.from_iterable(a)))
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SignalR - Sending a message to a specific user using (IUserIdProvider) *NEW 2.0.0*
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154
SignalR provides ConnectionId for each connection. To find which connection belongs to whom (the...
Move capture in lambda
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Generalized lambda capture in C++14
In C++14 we will have the so called generalized lambda capture. This enables move capture. The following will be legal code in C++14:
using namespace std;
// a unique_ptr is move-only
auto u = make_unique<some_type>...
What is the difference between single and double quotes in SQL?
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cmaher
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answered Jan 2 '10 at 18:22
OMG PoniesOMG Poni...
Get the last 4 characters of a string [duplicate]
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Like this:
>>>mystr = "abcdefghijkl"
>>>mystr[-4:]
'ijkl'
This slices the string's last 4 characters. The -4 starts the range from the string's end. A modified expression with [:-4] removes the same 4 characters from the end of the string:
>>>mystr[:-4]
'abcde...
How to create GUID / UUID?
...ifier), also known as GUIDs (Globally Unique IDentifier), according to RFC 4122, are identifiers designed to provide certain uniqueness guarantees.
While it is possible to implement an RFC-compliant UUIDs in a few lines of JS (E.g. see @broofa's answer, below) there are several common pitfalls:
I...
Postgres - FATAL: database files are incompatible with server
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413
If you recently upgraded to 11 or 12 from 10.x you can run the below command to upgrade your p...
using extern template (C++11)
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edited Nov 8 '17 at 6:48
user1902689
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answered...
Creating range in JavaScript - strange syntax
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4 Answers
4
Active
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Disable Enable Trigger SQL server for a table
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244
use the following commands instead:
ALTER TABLE table_name DISABLE TRIGGER tr_name
ALTER TABL...