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How to get Top 5 records in SqLite?
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586
SELECT * FROM Table_Name LIMIT 5;
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How to convert list of tuples to multiple lists?
...n zip() will almost do what you want:
>>> zip(*[(1, 2), (3, 4), (5, 6)])
[(1, 3, 5), (2, 4, 6)]
The only difference is that you get tuples instead of lists. You can convert them to lists using
map(list, zip(*[(1, 2), (3, 4), (5, 6)]))
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Returning first x items from array
I want to return first 5 items from array. How can I do this?
5 Answers
5
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php动态安装mysql扩展错误（ext/mysqlnd/mysqlnd.h: No such file or direc...
...rectory）错误如下：In file included from data xingzheng install php-5.5.10 include php Zend zend_compile.h:719, from ...错误如下：
In file included from /data/xingzheng/install/php-5.5.10/include/php/Zend/zend_compile.h:719,
from /data/xingzheng/install/php...
Logical operators for boolean indexing in Pandas
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How do I interpret precision and scale of a number in a database?
I have the following column specified in a database: decimal(5,2)
3 Answers
3
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Is it better to use std::memcpy() or std::copy() in terms to performance?
...ner was std::copy.
I wrote a C++ SHA-2 implementation. In my test, I hash 5 strings using all four SHA-2 versions (224, 256, 384, 512), and I loop 300 times. I measure times using Boost.timer. That 300 loop counter is enough to completely stabilize my results. I ran the test 5 times each, alternati...
Round to 5 (or other number) in Python
... function in Python, but this works for me:
Python 2
def myround(x, base=5):
return int(base * round(float(x)/base))
Python3
def myround(x, base=5):
return base * round(x/base)
It is easy to see why the above works. You want to make sure that your number divided by 5 is an integer, c...
Multiplication on command line terminal
...s built-in Arithmetic Expansion $(( )) to do some simple maths
$ echo "$((5 * 5))"
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Check the Shell Arithmetic section in the Bash Reference Manual for a complete list of operators.
For sake of completeness, as other pointed out, if you need arbitrary precision, bc or dc would be better.
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Finding all possible combinations of numbers to reach a given sum
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250
This problem can be solved with a recursive combinations of all possible sums filtering out tho...