Convert numpy array to tuple

Question

Note  This is asking for the reverse of the usual tuple-to-array conversion   I have to pass an argument to a  wrapped c    function as a nested tuple   For example  the following works  X   MyFunction    2 2   2 -2       whereas the following do not  X   MyFunction  numpy array   2 2   2 -2      X   MyFunction    2 2   2 -2       Unfortunately  the argument I would like to use comes to me as a numpy array   That array always has dimensions 2xN for some N  which may be quite large   Is there an easy way to convert that to a tuple   I know that I could just loop through  creating a new tuple  but would prefer if there s some nice access the numpy array provides   If it s not possible to do this as nicely as I hope  what s the prettiest way to do it by looping  or whatever

User · Answer

If you like long cuts  here is another way tuple tuple a m tolist    for a m in a    from numpy import array a   array   1  2               3  4    tuple tuple a m tolist    for a m in a     The output is    1  2    3  4    Note just  tuple a m tolist    for a m in a   will give a generator expresssion   Sort of inspired by  norok2 s comment to  Greg von Winckel s answer

User · Answer

Here s a function that ll do it   def totuple a       try          return tuple totuple i  for i in a      except TypeError          return a   And an example    gt  gt  gt  array   numpy array   2 2   2 -2     gt  gt  gt  totuple array    2  2    2  -2

User · Answer

Another option  tuple  tuple row  for row in myarray     If you are passing NumPy arrays to C   functions  you may also wish to look at using Cython or SWIG

User · Answer

I was not satisfied  so I finally used this    gt  gt  gt  a numpy array   1 2 3   4 5 6     gt  gt  gt  a array   1  2  3           4  5  6      gt  gt  gt  tuple a reshape 1  -1  0    1  2  3  4  5  6    I don t know if it s quicker  but it looks more effective

User · Answer

gt  gt  gt  arr   numpy array   2 2   2 -2     gt  gt  gt  tuple map tuple  arr     2  2    2  -2

[python] Convert numpy array to tuple

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