大约有 6,887 项符合查询结果（耗时：0.0198秒） [XML]
Dictionary returning a default value if the key does not exist [duplicate]
... DictionaryWithDefault object is upcast to a plain Dictionary, calling the indexer will use the base Dictionary implementation (throwing an exception if missing) rather than the subclass's implementation.
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Why does a RegExp with global flag give wrong results?
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A RegExp object with the g flag keeps track of the lastIndex where a match occurred, so on subsequent matches it will start from the last used index, instead of 0. Take a look:
var query = 'Foo B';
var re = new RegExp(query, 'gi');
var result = [];
result.push(re.test('Foo Ba...
A weighted version of random.choice
...: a must be 1-dimensional"), so in that case one can ask numpy to pick the index into the list, i.e. len(list_of_candidates), and then do list_of_candidates[draw]
– xjcl
Mar 17 '19 at 23:17
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How can I have a newline in a string in sh?
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If the string is the output of another command, I just use quotes
indexes_diff=$(git diff index.yaml)
echo "$indexes_diff"
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How to loop through an array containing objects and access their properties
...y
const myArray = [{x:100}, {x:200}, {x:300}];
myArray.forEach((element, index, array) => {
console.log(element.x); // 100, 200, 300
console.log(index); // 0, 1, 2
console.log(array); // same myArray object 3 times
});
Note: Array.prototype.forEach() is not a functional way strict...
How can I open the interactive matplotlib window in IPython notebook?
...pyplot as plt
import seaborn as sns
ts = pd.Series(np.random.randn(1000), index=pd.date_range('1/1/2000', periods=1000))
ts = ts.cumsum()
df = pd.DataFrame(np.random.randn(1000, 4), index=ts.index,
columns=['A', 'B', 'C', 'D'])
df = df.cumsum()
df.plot(); plt.legend(loc='best') ...
Paging with Oracle
...st: 300,110
Old method cost: 30
The new syntax caused a full scan of the index on my column, which was the entire cost. Chances are, things get much worse when limiting on unindexed data.
Let's have a look when including a single unindexed column on the previous dataset:
New method time/cost: ...
How do you search an amazon s3 bucket?
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Is there any indexing service like lucene.net to index these bucket documents.
– Munavvar
Aug 8 '16 at 11:23
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Best way to work with dates in Android SQLite [closed]
... takes care of the loading
public static Date loadDate(Cursor cursor, int index) {
if (cursor.isNull(index)) {
return null;
}
return new Date(cursor.getLong(index));
}
can be used like this:
entity.setDate(loadDate(cursor, INDEX));
Ordering by date is simple SQL ORDER clause...
Javascript infamous Loop issue? [duplicate]
... I would recommend to replace link.i = i with link.setAttribute("data-link-index",i) and replace alert(this.i) with alert(Number(this.getAttribute("data-link-index")))
– check_ca
Aug 16 '17 at 14:44
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