大约有 40,000 项符合查询结果（耗时：0.0560秒） [XML]
Python 3 turn range to a list
...can just fall back on range.
Also note that on python2.x, xrange is still indexable1. This means that range on python3.x also has the same property2
1print xrange(30)[12] works for python2.x
2The analogous statement to 1 in python3.x is print(range(30)[12]) and that works also.
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C# Iterate through Class properties
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// the index of each item in fieldNames must correspond to
// the correct index in resultItems
var fieldnames = new []{"itemtype", "etc etc "};
for (int e = 0; e < fieldNames.Length - 1; e++)
{
newRecord
.GetType()
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How to extract the first two characters of a string in shell scripting?
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In awk strings start at index 1, so you should use substr($0,1,2).
– Isaac
Feb 2 at 20:52
add a comment
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Get top 1 row of each group
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@domanokz: no, it's not a subquery. If you have correct indexes then millions shouldn't be a problem. There are only 2 set based ways anyway: this and the aggregate (Ariel's solution). So try them both...
– gbn
Jul 27 '11 at 9:30
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Disable intellij indexing on specific folder
...is created/updated when I deploy my app locally. Is it possible to disable indexing on that folder? Everything slows down whenever I deploy and it's really annoying - I have to wait a few minutes whilist intellij doing unnecessary indexing. In module view I excluded that folder but it's not helping....
Using LIMIT within GROUP BY to get N results per group?
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For me something like
SUBSTRING_INDEX(group_concat(col_name order by desired_col_order_name), ',', N)
works perfectly. No complicated query.
for example: get top 1 for each group
SELECT
*
FROM
yourtable
WHERE
id IN (SELECT
S...
How does one output bold text in Bash?
...e end of the sequence
1 - Bold attribute (see below for more)
[0m - resets all attributes, colors, formatting, etc.
The possible integers are:
0 - Normal Style
1 - Bold
2 - Dim
3 - Italic
4 - Underlined
5 - Blinking
7 - Reverse
8 - Invisible
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Shuffling a list of objects
...erm = list(range(len(list_one)))
random.shuffle(perm)
list_one = [list_one[index] for index in perm]
list_two = [list_two[index] for index in perm]
Numpy / Scipy
If your lists are numpy arrays, it is simpler:
import numpy as np
perm = np.random.permutation(len(list_one))
list_one = list_one[per...
Facebook database design?
...s to make a composite primary key. A unique key, absolutely. The clustered index on that unique key, definitely. But I'd also put some sort of non-composite identity as the PK with a nonclustered index. That would allow other tables that need a "friend relationship ID" FK to easily tie to this table...
How do you stash an untracked file?
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Add the file to the index:
git add path/to/untracked-file
git stash
The entire contents of the index, plus any unstaged changes to existing files, will all make it into the stash.
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