大约有 6,886 项符合查询结果（耗时：0.0310秒） [XML]
Python: changing value in a tuple
...wn, there are basically two ways of replacing a tuple's element at a given index. Either convert the tuple to a list, replace the element and convert back, or construct a new tuple by concatenation.
In [1]: def replace_at_index1(tup, ix, val):
...: lst = list(tup)
...: lst[ix] = val
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C++ STL Vectors: Get iterator from index?
So, I wrote a bunch of code that accesses elements in an stl vector by index[], but now I need to copy just a chunk of the vector. It looks like vector.insert(pos, first, last) is the function I want... except I only have first and last as ints. Is there any nice way I can get an iterator to these...
Why array implements IList?
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Because an array allows fast access by index, and IList/IList<T> is are the only collection interfaces that support this. So perhaps your real question is "Why is there no interface for constant collections with indexers?" And to that I have no answer.
Ther...
Why in Java 8 split sometimes removes empty strings at start of result array?
...2.
Java 7
public String[] split(CharSequence input, int limit) {
int index = 0;
boolean matchLimited = limit > 0;
ArrayList<String> matchList = new ArrayList<>();
Matcher m = matcher(input);
// Add segments before each match found
while(m.find()) {
i...
Java 8 forEach with index [duplicate]
Is there a way to build a forEach method in Java 8 that iterates with an index? Ideally I'd like something like this:
3 A...
z-index not working with position absolute
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The second div is position: static (the default) so the z-index does not apply to it.
You need to position (set the position property to anything other than static, you probably want relative in this case) anything you want to give a z-index to.
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How do you reindex an array in PHP?
I have the following array, which I would like to reindex so the keys are reversed (ideally starting at 1):
21 Answers
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How to get the nth element of a python list or a default if not available
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l[index] if index < len(l) else default
To support negative indices we can use:
l[index] if -len(l) <= index < len(l) else default
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What is cardinality in MySQL?
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It is an estimate of the number of unique values in the index.
For a table with a single primary key column, the cardinality should normally be equal to the number of rows in the table.
More information.
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A migration to add unique constraint to a combination of columns
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add_index :people, [:firstname, :lastname, :dob], :unique => true
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