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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...
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...
In Python, how do I index a list with another list?
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245
T = [L[i] for i in Idx]
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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...
using extern template (C++11)
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edited Nov 8 '17 at 6:48
user1902689
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answered...
Java Enum Methods - return opposite direction enum
...Direction getOppositeDirection() {
return VALUES[(ordinal() + 2) % 4];
}
}
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Transpose/Unzip Function (inverse of zip)?
...pecial * operator.
>>> zip(*[('a', 1), ('b', 2), ('c', 3), ('d', 4)])
[('a', 'b', 'c', 'd'), (1, 2, 3, 4)]
The way this works is by calling zip with the arguments:
zip(('a', 1), ('b', 2), ('c', 3), ('d', 4))
… except the arguments are passed to zip directly (after being converted to...
Creating range in JavaScript - strange syntax
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How to ignore xargs commands if stdin input is empty?
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kenorb
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answered Nov 28 '11 at 13:49
Sven MarnachSve...