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__doc__ = u"""
>>> v = [(17, 10), (-17, 10), (-17, -10), (17, -10)]
>>> standard = [(a % b) for a, b in v]
>>> standard
[7, 3, -7, -3]
>>> [mod_int_py(a, b) for a, b in v] == standard
True
>>> [mod_short_py(a, b) for a, b in v] == standard
True
>>> [mod_float_py(a, b) for a, b in v] == standard
True
>>> [mod_double_py(a, b) for a, b in v] == standard
True
>>> [mod_int_c(a, b) for a, b in v]
[7, -7, -7, 7]
>>> [mod_float_c(a, b) for a, b in v]
[7.0, -7.0, -7.0, 7.0]
>>> [mod_double_c(a, b) for a, b in v]
[7.0, -7.0, -7.0, 7.0]
>>> [div_int_py(a, b) for a, b in v]
[1, -2, 1, -2]
>>> [div_int_c(a, b) for a, b in v]
[1, -1, 1, -1]
>>> [test_cdiv_cmod(a, b) for a, b in v]
[(1, 7), (-1, -7), (1, -7), (-1, 7)]
>>> [test_cdiv_cmod(a, b) for a, b in [(4, -4), (4, -2), (4, -1)]]
[(-1, 0), (-2, 0), (-4, 0)]
>>> all([mod_int_py(a,b) == a % b for a in range(-10, 10) for b in range(-10, 10) if b != 0])
True
>>> all([div_int_py(a,b) == a // b for a in range(-10, 10) for b in range(-10, 10) if b != 0])
True
"""
import warnings
orig_showwarning = warnings.showwarning
true_py_functions = {}
exec "def simple_warn(msg, *args): print(msg)" in true_py_functions
simple_warn = true_py_functions['simple_warn']
del true_py_functions
def _all(seq):
for x in seq:
if not x:
return False
return True
try:
all
except NameError:
all = _all
cimport cython
@cython.cdivision(False)
def mod_int_py(int a, int b):
return a % b
@cython.cdivision(False)
def mod_short_py(short a, short b):
return a % b
@cython.cdivision(False)
def mod_double_py(double a, double b):
return a % b
@cython.cdivision(False)
def mod_float_py(float a, float b):
return a % b
@cython.cdivision(True)
def mod_int_c(int a, int b):
return a % b
@cython.cdivision(True)
def mod_float_c(float a, float b):
return a % b
@cython.cdivision(True)
def mod_double_c(double a, double b):
return a % b
@cython.cdivision(False)
def div_int_py(int a, int b):
return a // b
@cython.cdivision(True)
def div_int_c(int a, int b):
return a // b
@cython.cdivision(False)
def test_cdiv_cmod(short a, short b):
cdef short q = cython.cdiv(a, b)
cdef short r = cython.cmod(a, b)
return q, r
@cython.cdivision(True)
@cython.cdivision_warnings(True)
def mod_int_c_warn(int a, int b):
"""
>>> warnings.showwarning = simple_warn
>>> mod_int_c_warn(-17, 10)
division with oppositely signed operands, C and Python semantics differ
-7
>>> warnings.showwarning = orig_showwarning
"""
return a % b
@cython.cdivision(True)
@cython.cdivision_warnings(True)
def div_int_c_warn(int a, int b):
"""
>>> warnings.showwarning = simple_warn
>>> div_int_c_warn(-17, 10)
division with oppositely signed operands, C and Python semantics differ
-1
>>> warnings.showwarning = orig_showwarning
"""
return a // b
@cython.cdivision(False)
@cython.cdivision_warnings(True)
def complex_expression(int a, int b, int c, int d):
"""
>>> warnings.showwarning = simple_warn
>>> complex_expression(-150, 20, 19, -7)
verbose_call(20)
division with oppositely signed operands, C and Python semantics differ
verbose_call(19)
division with oppositely signed operands, C and Python semantics differ
-2
>>> warnings.showwarning = orig_showwarning
"""
return (a // verbose_call(b)) % (verbose_call(c) // d)
cdef int verbose_call(int x):
print u"verbose_call(%s)" % x
return x
# These may segfault with cdivision
@cython.cdivision(False)
def mod_div_zero_int(int a, int b, int c):
"""
>>> mod_div_zero_int(25, 10, 2)
verbose_call(5)
2
>>> print(mod_div_zero_int(25, 10, 0))
verbose_call(5)
integer division or modulo by zero
>>> print(mod_div_zero_int(25, 0, 0))
integer division or modulo by zero
"""
try:
return verbose_call(a % b) / c
except ZeroDivisionError, ex:
return unicode(ex)
@cython.cdivision(False)
def mod_div_zero_float(float a, float b, float c):
"""
>>> mod_div_zero_float(25, 10, 2)
2.5
>>> print(mod_div_zero_float(25, 10, 0))
float division
>>> print(mod_div_zero_float(25, 0, 0))
float divmod()
"""
try:
return (a % b) / c
except ZeroDivisionError, ex:
return unicode(ex)
@cython.cdivision(False)
def py_div_long(long a, long b):
"""
>>> py_div_long(-5, -1)
5
>>> import sys
>>> maxint = getattr(sys, ((sys.version_info[0] >= 3) and 'maxsize' or 'maxint'))
>>> py_div_long(-maxint-1, -1) # doctest: +ELLIPSIS
Traceback (most recent call last):
...
OverflowError: ...
"""
return a / b
def c_div_const_test(a, b):
"""
>>> c_div_const_test(5, 3)
1
"""
return c_div_const(a, b)
cdef long c_div_const(const long a, int b):
cdef long c = a / b
return c
|
