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  • python - Index of element in NumPy array - Stack Overflow
    This problem can be solved efficiently using the numpy_indexed library (disclaimer: I am its author); which was created to address problems of this type npi indices can be viewed as an n-dimensional generalisation of list index It will act on nd-arrays (along a specified axis); and also will look up multiple entries in a vectorized manner as
  • python - How to find all occurrences of an element in a list - Stack . . .
    NOTE: A note of caution based on Chris_Rands' comment: this solution is faster than the list comprehension if the results are sufficiently sparse, but if the list has many instances of the element that is being searched (more than ~15% of the list, on a test with a list of 1000 integers), the list comprehension is faster
  • python - How do i get index of list in list? - Stack Overflow
    For multidimensional indexing, assuming your data can be represented as NxM (and not a general list of lists), numpy is very useful (and fast)
  • In Python, how do I index a list with another list?
    I would like to index a list with another list like this L = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'] Idx = [0, 3, 7] T = L[ Idx ] and T should end up being a list
  • Finding first and last index of some value in a list in Python
    The x-axis is for the location of the searched element: 0% means it's at the start of the list, 100% means it's at the end of the list All solutions are fastest at location 100%, with the two reversed solutions taking pretty much no time for that, the double-reverse solution taking a little time, and the reverse-copy taking a lot of time
  • Find the index of a list element in Python - Stack Overflow
    There are two ways you could go about finding the index of an element from an array in Python The first and the most straightforward way to do so is by using the index() method of any list, which returns the index at which the specified value is located
  • How to find index of an element in Python list? - Stack Overflow
    Python allows a very simple syntax to check whether something is contained in a list: censor = [ 'bugger', 'nickle' ] word = 'bugger' if word in censor: print 'CENSORED' With that approach, simply walk over your list of words and test for each words whether it’s in the censor list To walk over your list of words, you can use the for loop
  • python - Getting indices of True values in a boolean list - Stack Overflow
    TL; DR: use np where as it is the fastest option Your options are np where, itertools compress, and list comprehension


















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