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cimport cython
def f(a,b):
"""
>>> str(f(5, 7))
'29509034655744'
"""
a += b
a *= b
a **= b
return a
def g(int a, int b):
"""
>>> g(13, 4)
32
"""
a -= b
a /= b
a <<= b
return a
def h(double a, double b):
"""
>>> h(56, 7)
105.0
"""
a /= b
a += b
a *= b
return a
from libc cimport stdlib
def arrays():
"""
>>> arrays()
19
"""
cdef char* buf = <char*>stdlib.malloc(10)
cdef int i = 2
cdef object j = 2
buf[2] = 0
buf[i] += 2
buf[2] *= 10
buf[j] -= 1
print buf[2]
stdlib.free(buf)
cdef class A:
cdef attr
cdef int attr2
cdef char* buf
def __init__(self):
self.attr = 3
self.attr2 = 3
class B:
attr = 3
def attributes():
"""
>>> attributes()
26 26 26
"""
cdef A a = A()
b = B()
a.attr += 10
a.attr *= 2
a.attr2 += 10
a.attr2 *= 2
b.attr += 10
b.attr *= 2
print a.attr, a.attr2, b.attr
def get_2(): return 2
cdef int identity(int value): return value
def smoketest():
"""
>>> smoketest()
10
"""
cdef char* buf = <char*>stdlib.malloc(10)
cdef A a = A()
a.buf = buf
a.buf[identity(1)] = 0
(a.buf + identity(4) - <int>(2*get_2() - 1))[get_2() - 2*identity(1)] += 10
print a.buf[1]
stdlib.free(buf)
def side_effect(x):
print u"side effect", x
return x
cdef int c_side_effect(int x):
print u"c side effect", x
return x
def test_side_effects():
"""
>>> test_side_effects()
side effect 1
c side effect 2
side effect 3
c side effect 4
([0, 11, 102, 3, 4], [0, 1, 2, 13, 104])
"""
cdef object a = list(range(5))
a[side_effect(1)] += 10
a[c_side_effect(2)] += 100
cdef int i
cdef int[5] b
for i from 0 <= i < 5:
b[i] = i
b[side_effect(3)] += 10
b[c_side_effect(4)] += 100
return a, [b[i] for i from 0 <= i < 5]
@cython.cdivision(True)
def test_inplace_cdivision(int a, int b):
"""
>>> test_inplace_cdivision(13, 10)
3
>>> test_inplace_cdivision(13, -10)
3
>>> test_inplace_cdivision(-13, 10)
-3
>>> test_inplace_cdivision(-13, -10)
-3
"""
a %= b
return a
@cython.cdivision(False)
def test_inplace_pydivision(int a, int b):
"""
>>> test_inplace_pydivision(13, 10)
3
>>> test_inplace_pydivision(13, -10)
-7
>>> test_inplace_pydivision(-13, 10)
7
>>> test_inplace_pydivision(-13, -10)
-3
"""
a %= b
return a
def test_complex_inplace(double complex x, double complex y):
"""
>>> test_complex_inplace(1, 1)
(2+0j)
>>> test_complex_inplace(2, 3)
(15+0j)
>>> test_complex_inplace(2+3j, 4+5j)
(-16+62j)
"""
x += y
x *= y
return x
# The following is more subtle than one might expect.
cdef struct Inner:
int x
cdef struct Aa:
int value
Inner inner
cdef struct NestedA:
Aa a
cdef struct ArrayOfA:
Aa[10] a
def nested_struct_assignment():
"""
>>> nested_struct_assignment()
"""
cdef NestedA nested
nested.a.value = 2
nested.a.value += 3
assert nested.a.value == 5
nested.a.inner.x = 5
nested.a.inner.x += 10
assert nested.a.inner.x == 15
def nested_array_assignment():
"""
>>> nested_array_assignment()
c side effect 0
c side effect 1
"""
cdef ArrayOfA array
array.a[0].value = 2
array.a[c_side_effect(0)].value += 3
assert array.a[0].value == 5
array.a[1].inner.x = 5
array.a[c_side_effect(1)].inner.x += 10
assert array.a[1].inner.x == 15
cdef class VerboseDict(object):
cdef name
cdef dict dict
def __init__(self, name, **kwds):
self.name = name
self.dict = kwds
def __getitem__(self, key):
print self.name, "__getitem__", key
return self.dict[key]
def __setitem__(self, key, value):
print self.name, "__setitem__", key, value
self.dict[key] = value
def __repr__(self):
return repr(self.name)
def deref_and_increment(o, key):
"""
>>> deref_and_increment({'a': 1}, 'a')
side effect a
>>> v = VerboseDict('v', a=10)
>>> deref_and_increment(v, 'a')
side effect a
v __getitem__ a
v __setitem__ a 11
"""
o[side_effect(key)] += 1
def double_deref_and_increment(o, key1, key2):
"""
>>> v = VerboseDict('v', a=10)
>>> w = VerboseDict('w', vkey=v)
>>> double_deref_and_increment(w, 'vkey', 'a')
side effect vkey
w __getitem__ vkey
side effect a
v __getitem__ a
v __setitem__ a 11
"""
o[side_effect(key1)][side_effect(key2)] += 1
def conditional_inplace(value, a, condition, b):
"""
>>> conditional_inplace([1, 2, 3], [100], True, [200])
[1, 2, 3, 100]
>>> conditional_inplace([1, 2, 3], [100], False, [200])
[1, 2, 3, 200]
"""
value += a if condition else b
return value
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