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Colon (:) in Python list index [duplicate]
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Remember that [1:5] starts with the object at index 1, and the object at index 5 is not included. You can also make a soft copy of a list with [:]
– Garrett Hyde
Oct 25 '10 at 7:51
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Backbone.js: How to get the index of a model in a Backbone Collection?
Is there a way to find the index of a model within a collection?
1 Answer
1
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C++/COM VARIANT实现二维数组 - C/C++ - 清泛网 - 专注C/C++及内核技术
... NULL;
/*对二维数组的元素进行逐个赋值*/
long index[2] = {0, 0};
long lFirstLBound = 0;
long lFirstUBound = 0;
long lSecondLBound = 0;
long lSecondUBound = 0;
SafeArrayGetLBound(psa, 1, &lFirstLBound);
SafeArrayGetUBound(psa, 1, ...
xunsearch主键重复、搜索结果重复 - 更多技术 - 清泛网 - 专注C/C++及内核技术
xunsearch主键重复、搜索结果重复使用 $xs->index->update(key) 建立新索引时，可能由于缓存没有及时写入服务器主索引，因此重复执行该语句可能就会导致同一记录重复插入
try {
$xs = new XS('itech.so');
$index = ...
【phpcms v9】html静态化设置及URL规则优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...RL规则优化1、默认的栏目生成规则是：{$categorydir}{$catdir} index html|{$categorydir}{$catdir} {$page} html具体生成html的时候，将会显示成：news china 1000 html。这个有点小问题，
1、默认的栏目生成规则是：
{$categorydir}{$catdir}/index.html|{$c...
How to remove constraints from my MySQL table?
...rrect, because simply removing the foreign key will not remove the related index. Of course the index may have been created separately, but if it was created as a consequence of adding the foreign key in the first place, then it will not be removed simply by dropping the foreign key.
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Conditional Replace Pandas
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.ix indexer works okay for pandas version prior to 0.20.0, but since pandas 0.20.0, the .ix indexer is deprecated, so you should avoid using it. Instead, you can use .loc or iloc indexers. You can solve this problem by:
mask = d...
How to read a .xlsx file using the pandas Library in iPython?
...xcel:
read_excel(io, sheetname=0, header=0, skiprows=None, skip_footer=0, index_col=None, names=None, parse_cols=None, parse_dates=False, date_parser=None, na_values=None, thousands=None, convert_float=True, has_index_names=None, converters=None, true_values=None, false_values=None, engine=None, sq...
Create unique constraint with null columns
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Create two partial indexes:
CREATE UNIQUE INDEX favo_3col_uni_idx ON favorites (user_id, menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way,...
Add Foreign Key to existing table
...150/
On the top of my head two things come to mind.
Is your foreign key index a unique name in the whole database (#3 in the list)?
Are you trying to set the table PK to NULL on update (#5 in the list)?
I'm guessing the problem is with the set NULL on update (if my brains aren't on backwards to...