Index all *except* one item in python
For a list, you could use a list comp. For example, to make b
a copy of a
without the 3rd element:
a = range(10)[::-1] # [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]b = [x for i,x in enumerate(a) if i!=3] # [9, 8, 7, 5, 4, 3, 2, 1, 0]
This is very general, and can be used with all iterables, including numpy arrays. If you replace []
with ()
, b
will be an iterator instead of a list.
Or you could do this in-place with pop
:
a = range(10)[::-1] # a = [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]a.pop(3) # a = [9, 8, 7, 5, 4, 3, 2, 1, 0]
In numpy you could do this with a boolean indexing:
a = np.arange(9, -1, -1) # a = array([9, 8, 7, 6, 5, 4, 3, 2, 1, 0])b = a[np.arange(len(a))!=3] # b = array([9, 8, 7, 5, 4, 3, 2, 1, 0])
which will, in general, be much faster than the list comprehension listed above.
>>> l = range(1,10)>>> l[1, 2, 3, 4, 5, 6, 7, 8, 9]>>> l[:2] [1, 2]>>> l[3:][4, 5, 6, 7, 8, 9]>>> l[:2] + l[3:][1, 2, 4, 5, 6, 7, 8, 9]>>>
See also