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How to take the first N items from a generator or list in Python? [duplicate]
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In my taste, it's also very concise to combine zip() with xrange(n) (or range(n) in Python3), which works nice on generators as well and seems to be more flexible for changes in general.
# Option #1: taking the first n elements as a list
[x for _, x in zip(xrange(n), generator)]
# ...
How to return a part of an array in Ruby?
... or nil
array[start, length] -> an_array or nil
array[range] -> an_array or nil
array.slice(index) -> obj or nil
array.slice(start, length) -> an_array or nil
array.slice(range) -> an_array or nil
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C++11 range based loop: get item by value or reference to const
Reading some examples of range based loops they suggest two main ways 1, 2, 3, 4
4 Answers
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How to get indices of a sorted array in Python
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myList = [1, 2, 3, 100, 5]
sorted(range(len(myList)),key=myList.__getitem__)
[0, 1, 2, 4, 3]
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range over interface{} which stores a slice
...ts t interface{} . If it is determined that the t is a slice, how do I range over that slice?
3 Answers
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Conversion of a datetime2 data type to a datetime data type results out-of-range value
...at kind of dates do you have in the column?
Do all of them fit within the range of the type?
As an aside, the correct way to get a Type object for the DataColumn constructor is the typeof keyword, which is orders of magnitude faster.
Therefore, to create the column, you should write
new DataCo...
What is the bower (and npm) version syntax?
...chema. (As does the related caret operator ^.) You can use ~ to narrow the range of versions you're willing to accept to either:
subsequent patch-level changes to the same minor version ("bug fixes not affecting the API"), or:
subsequent minor-level changes to the same major version ("backwards co...
How can I generate a unique ID in Python? [duplicate]
...wice times for the same period.
the seed must be at least 1 to 2**13 range. if we want to ensure uniqueness for two hours (100% contingency), we need
a seed for 1 to 2**14 range. that's what we have with this algorithm. You have to increment seed_range_bits if you
move your machin...
What's the Hi/Lo algorithm?
...h" sequence, knowing that it can then safely generate keys from the entire range of the previous "high" value with the variety of "low" values.
For instance, supposing you have a "high" sequence with a current value of 35, and the "low" number is in the range 0-1023. Then the client can increment t...
Find XOR of all numbers in a given range
You are given a large range [a,b] where 'a' and 'b' can be typically between 1 and 4,000,000,000 inclusive. You have to find out the XOR of all the numbers in the given range.
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