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Is there any way to tell Cython compiler that param is function. Something like
cpdef float calc_class_re(list data, func callback)
609
Cython uses type hints (although mostly its own peculiar breed of them) to generate C code from Python, and the mypyc project uses Python's native type hinting to do the same.
Cython is fast at the same time provides flexibility of being object-oriented, functional, and dynamic programming language. One of the key aspects of Cython include optional static type declarations which comes out of the box.
Cython allows native C functions, which have less overhead than Python functions when they are called, and therefore execute faster.
The nogil function annotation declares that it is safe to call the function without the GIL. It is perfectly allowed to execute it while holding the GIL. The function does not in itself release the GIL if it is held by the caller.
Should be self-explanatory..? :)
# Define a new type for a function-type that accepts an integer and
# a string, returning an integer.
ctypedef int (*f_type)(int, str)
# Extern a function of that type from foo.h
cdef extern from "foo.h":
int do_this(int, str)
# Passing this function will not work.
cpdef int do_that(int a, str b):
return 0
# However, this will work.
cdef int do_stuff(int a, str b):
return 0
# This functio uses a function of that type. Note that it cannot be a
# cpdef function because the function-type is not available from Python.
cdef void foo(f_type f):
print f(0, "bar")
# Works:
foo(do_this) # the externed function
foo(do_stuff) # the cdef function
# Error:
# Cannot assign type 'int (int, str, int __pyx_skip_dispatch)' to 'f_type'
foo(do_that) # the cpdef function
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