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Loop backwards using indices in Python?
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In my opinion, this is the most readable:
for i in reversed(xrange(101)):
print i,
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Rank items in an array using Python/NumPy, without sorting array twice
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Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...则而已（当然了，这话我自己听着都有些刺耳，实在不好意思，其实关于性能优化的优质博文网上也还是有很多的，譬如Google官方都已经推出了优化专题，我这里只是总结下自的感悟而已，若有得罪欢迎拍砖，我愿挨打，因为我...
How is a CRC32 checksum calculated?
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Or in hex and binary:
0x 01 04 C1 1D B7
1 0000 0100 1100 0001 0001 1101 1011 0111
The highest term (x32) is usually not explicitly written, so it can instead be represented in hex just as
0x 04 C1 1D B7
Feel free to count the 1s and 0s, but you'll find they match up with the polynomia...
SQL query to group by day
...s on what DBMS you are using but in regular SQL convert(varchar,DateColumn,101) will change the DATETIME format to date (one day)
so:
SELECT
sum(amount)
FROM
sales
GROUP BY
convert(varchar,created,101)
the magix number 101 is what date format it is converted to
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Count cells that contain any text
...act number of empty cells from total number of cell by formula like
=row(G101)-row(G4)+1-countblank(G4:G101)
In case of 2-dimensional array it would be
=(row(G101)-row(A4)+1)*(column(G101)-column(A4)+1)-countblank(A4:G101)
Tested at google docs.
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Byte array to image conversion
...t it can lead to, let's generate PixelFormat.Format24bppRgb gradient image 101x101:
var width = 101;
var height = 101;
var gradient = new byte[width * height * 3 /* bytes per pixel */];
for (int i = 0, pixel = 0; i < gradient.Length; i++, pixel = i / 3)
{
var x = pixel % height;
var y = ...
How to fix Python indentation
...:
$ # see what changes it would make
$ autopep8 path/to/file.py --select=E101,E121 --diff
$ # make these changes
$ autopep8 path/to/file.py --select=E101,E121 --in-place
Note: E101 and E121 are pep8 indentation (I think you can simply pass --select=E1 to fix all indentation related issues - thos...
Change one value based on another value in pandas
...ey errors.
>>> import pandas as pd
>>> data = { 'ID': [ 101, 201, 301, 401 ] }
>>> df = pd.DataFrame(data)
>>> class SurnameMap(dict):
... def __missing__(self, key):
... return ''
...
>>> surnamemap = SurnameMap()
>>> surnamema...
How exactly does __attribute__((constructor)) work?
...ties 0-100 are reserved
*/
void construct1 () __attribute__ ((constructor (101)));
void construct2 () __attribute__ ((constructor (102)));
void destruct1 () __attribute__ ((destructor (101)));
void destruct2 () __attribute__ ((destructor (102)));
/* init_some_function() - called by elf_init()
*/
i...