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PONumpy->Cython conversion: Compile error:Cannot convert 'npy_intp *' to Python object
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copied!<p>I have the following code that is to be propperly converted to cython:</p> <pre><code>from numpy import * ## returns winning players or [] if undecided. def score(board): scores = [] checked = zeros(board.shape) for i in xrange(len(board)): for j in xrange(len(board)): if checked[i,j] == 0 and board[i,j] !=0: ... do stuf </code></pre> <p>my attempt at conversion to cython:</p> <pre><code>import numpy as np cimport numpy as np @cython.boundscheck(False) @cython.wraparound(False) @cython.nonecheck(False) ## returns winning players or [] if undecided. def score(np.ndarray[int, ndim=2] board): scores = [] cdef np.ndarray[int, ndim = 2 ] checked checked = np.zeros(board.shape) for i in xrange(len(board)): for j in xrange(len(board)): if checked[i,j] == 0 and board[i,j] !=0: ... do stuf </code></pre> <p>But when I compile I get :</p> <pre><code>$ python setup.py build_ext --inplace running build_ext cythoning newgox.pyx to newgox.c ## returns winning players or [] if undecided. def score(np.ndarray[int, ndim=2] board): scores = [] cdef np.ndarray[int, ndim = 2 ] checked checked = np.zeros(board.shape) ^ ------------------------------------------------------------ newgox.pyx:58:28: Cannot convert 'npy_intp *' to Python object building 'newgox' extension </code></pre> <p>Also, I'm not sure this is the right way to work with lists in cython:</p> <pre><code>scores = [] if some_stuff_is_true: scores.append(some_integer) </code></pre> <p>EDIT:</p> <p>Thanks, the code now compiles but when I run it I get the error:</p> <pre><code>File "newgox.pyx", line 63, in newgox.score (newgox.c:1710) def score(np.ndarray[np.int, ndim=2] board): ValueError: Buffer dtype mismatch, expected 'int object' but got 'long' </code></pre> <p>I tied these two options:</p> <pre><code>ctypedef np.int_t DTYPE_t DTYPE = np.int </code></pre> <p>and then continue to:</p> <pre><code>board = zeros((5,5), dtype = DTYPE) def score(np.ndarray[DTYPE, ndim=2] board): </code></pre> <p>or just in both declarations:</p> <pre><code> ... np.int ... </code></pre> <p>This results in the same error, but with signature:</p> <pre><code> ValueError: Buffer dtype mismatch, expected 'int' but got 'long' </code></pre> <hr> <p>Thanks bellamyj, but your suggested code won't compile,</p> <pre><code>$ python setup.py build_ext --inplace running build_ext cythoning newgox.pyx to newgox.c building 'newgox' extension gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -arch i386 -arch x86_64 -g -O2 -DNDEBUG -g -O3 -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c newgox.c -o build/temp.macosx-10.6-intel-2.7/newgox.o newgox.c:238:31: error: numpy/arrayobject.h: No such file or directory newgox.c:239:31: error: numpy/ufuncobject.h: No such file or directory newgox.c:356: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘__pyx_t_5numpy_int8_t’ newgox.c:365: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘__pyx_t_5numpy_int16_t’ newgox.c:374: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘__pyx_t_5numpy_int32_t’ </code></pre> <p>And it continues to enumerate all other types as well. </p> <p>Then is tells me this:</p> <pre><code>newgox.c:978: error: expected ‘)’ before ‘*’ token newgox.c:979: error: expected ‘)’ before ‘*’ token newgox.c:980: error: expected ‘)’ before ‘*’ token newgox.c:983: error: expected declaration specifiers or ‘...’ before ‘PyArrayObject’ newgox.c:984: error: expected declaration specifiers or ‘...’ before ‘PyArrayObject’ newgox.c:985: error: expected ‘)’ before ‘*’ token newgox.c:987: error: ‘__pyx_t_5numpy_int32_t’ undeclared here (not in a function) newgox.c: In function ‘__pyx_pf_6newgox_7score’: newgox.c:1638: error: ‘PyArrayObject’ undeclared (first use in this function) newgox.c:1638: error: (Each undeclared identifier is reported only once newgox.c:1638: error: for each function it appears in.) newgox.c:1638: error: ‘__pyx_v_checked’ undeclared (first use in this function) newgox.c:1659: error: ‘__pyx_t_5’ undeclared (first use in this function) newgox.c:1721: error: expected expression before ‘)’ token newgox.c:1723: error: expected expression before ‘)’ token newgox.c:1747: error: expected expression before ‘)’ token newgox.c:1766: error: expected expression before ‘)’ token newgox.c:1813: error: expected expression before ‘)’ token newgox.c:1846: error: expected expression before ‘)’ token newgox.c:1846: error: too many arguments to function ‘__pyx_f_6newgox_check_life’ newgox.c:2009: error: expected expression before ‘)’ token newgox.c:2009: warning: assignment makes pointer from integer without a cast newgox.c:2012: error: expected expression before ‘)’ token newgox.c:2032: error: expected expression before ‘)’ token newgox.c: At top level: newgox.c:2088: error: expected declaration specifiers or ‘...’ before ‘PyArrayObject’ newgox.c: In function ‘__pyx_f_6newgox_check_life’: newgox.c:2124: error: ‘__pyx_v_board’ undeclared (first use in this function) newgox.c:2160: error: ‘PyArrayObject’ undeclared (first use in this function) newgox.c:2160: error: expected expression before ‘)’ token newgox.c:2160: error: too many arguments to function ‘__pyx_f_6newgox_liberty’ newgox.c:2420: error: too many arguments to function ‘__pyx_f_6newgox_check_life’ newgox.c: At top level: newgox.c:2583: error: expected declaration specifiers or ‘...’ before ‘PyArrayObject’ newgox.c: In function ‘__pyx_f_6newgox_liberty’: newgox.c:2610: error: ‘__pyx_v_board’ undeclared (first use in this function) newgox.c: At top level: newgox.c:2859: error: expected ‘)’ before ‘*’ token newgox.c: In function ‘__pyx_pf_5numpy_7ndarray___getbuffer__’: newgox.c:2999: error: ‘PyArray_Descr’ undeclared (first use in this function) newgox.c:2999: error: ‘__pyx_v_descr’ undeclared (first use in this function) newgox.c:3062: error: ‘PyArrayObject’ undeclared (first use in this function) newgox.c:3062: error: expected expression before ‘)’ token newgox.c:3071: error: ‘npy_intp’ undeclared (first use in this function) newgox.c:3114: error: expected expression before ‘)’ token newgox.c:3114: error: ‘NPY_C_CONTIGUOUS’ undeclared (first use in this function) newgox.c:3154: error: expected expression before ‘)’ token newgox.c:3154: error: ‘NPY_F_CONTIGUOUS’ undeclared (first use in this function) newgox.c:3184: error: expected expression before ‘)’ token newgox.c:3184: warning: assignment makes pointer from integer without a cast newgox.c:3240: error: expected expression before ‘)’ token newgox.c:3240: error: subscripted value is neither array nor pointer newgox.c:3249: error: expected expression before ‘)’ token newgox.c:3249: error: subscripted value is neither array nor pointer newgox.c:3262: error: expected expression before ‘)’ token newgox.c:3271: error: expected expression before ‘)’ token newgox.c:3291: error: expected expression before ‘)’ token </code></pre> <p>And some more.</p> <p>Notice it says :</p> <pre><code>newgox.c:2160: error: too many arguments to function ‘__pyx_f_6newgox_liberty’ newgox.c:2420: error: too many arguments to function ‘__pyx_f_6newgox_check_life’ </code></pre> <p>But my call from score/1 to check_life is:</p> <pre><code>life, newly_checked = check_life(i,j,board,[]) </code></pre> <p>And it is received like this:</p> <pre><code># helper functions of score/1 cdef check_life(int i, int j, np.ndarray[int, ndim=2] board, checked): ... return life, checked </code></pre> <p>Finally, what kind of data type is the "i4" that you use?</p>

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