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Multiple levels of 'collection.defaultdict' in Python
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347
Use:
from collections import defaultdict
d = defaultdict(lambda: defaultdict(int))
This will ...
CALayer with transparent hole in it
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answered May 13 '13 at 9:27
animal_chinanimal_chin
6,38099 gold badges3434 silver badges4040 bronze badges
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How to return 2 values from a Java method?
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edited May 14 '10 at 11:47
answered May 14 '10 at 7:58
Jes...
How to integrate nodeJS + Socket.IO and PHP?
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Jérémy DutheilJérémy Dutheil
5,75366 gold badges3434 silver badges5151 bronze badges
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When to use actors instead of messaging solutions such as WebSphere MQ or Tibco Rendezvous?
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edited May 23 '17 at 12:10
Community♦
111 silver badge
answered Oct 22 '12 at 19:15
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RabbitMQ and relationship between channel and connection
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edited Sep 17 '19 at 8:55
Lovisa Johansson
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Where does Java's String constant pool live, the heap or the stack?
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74
The answer is technically neither. According to the Java Virtual Machine Specification, the ar...
SQL Server: SELECT only the rows with MAX(DATE)
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187
If rownumber() over(...) is available for you ....
select OrderNO,
PartCode,
Quan...
Useful code which uses reduce()? [closed]
...re's some cute usages:
Flatten a list
Goal: turn [[1, 2, 3], [4, 5], [6, 7, 8]] into [1, 2, 3, 4, 5, 6, 7, 8].
reduce(list.__add__, [[1, 2, 3], [4, 5], [6, 7, 8]], [])
List of digits to a number
Goal: turn [1, 2, 3, 4, 5, 6, 7, 8] into 12345678.
Ugly, slow way:
int("".join(map(str, [1,2,3,4,...
How many GCC optimization levels are there?
...an the same thing.
The original version of this answer stated there were 7 options. GCC has since added -Og to bring the total to 8
From the man page:
-O (Same as -O1)
-O0 (do no optimization, the default if no optimization level is specified)
-O1 (optimize minimally)
-O2 (optimiz...