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|
# mode: run
# tag: generators
import sys
import cython
def very_simple():
"""
>>> x = very_simple()
>>> next(x)
1
>>> next(x)
Traceback (most recent call last):
StopIteration
>>> next(x)
Traceback (most recent call last):
StopIteration
>>> x = very_simple()
>>> x.send(1)
Traceback (most recent call last):
TypeError: can't send non-None value to a just-started generator
"""
yield 1
def simple():
"""
>>> x = simple()
>>> list(x)
[1, 2, 3]
"""
yield 1
yield 2
yield 3
def simple_seq(seq):
"""
>>> x = simple_seq("abc")
>>> list(x)
['a', 'b', 'c']
"""
for i in seq:
yield i
def simple_send():
"""
>>> x = simple_send()
>>> next(x)
>>> x.send(1)
1
>>> x.send(2)
2
>>> x.send(3)
3
"""
i = None
while True:
i = yield i
def raising():
"""
>>> x = raising()
>>> next(x)
Traceback (most recent call last):
KeyError: 'foo'
>>> next(x)
Traceback (most recent call last):
StopIteration
"""
yield {}['foo']
def with_outer(*args):
"""
>>> x = with_outer(1, 2, 3)
>>> list(x())
[1, 2, 3]
"""
def generator():
for i in args:
yield i
return generator
def test_close():
"""
>>> x = test_close()
>>> x.close()
>>> x = test_close()
>>> next(x)
>>> x.close()
>>> next(x)
Traceback (most recent call last):
StopIteration
"""
while True:
yield
def test_ignore_close():
"""
>>> x = test_ignore_close()
>>> x.close()
>>> x = test_ignore_close()
>>> next(x)
>>> x.close()
Traceback (most recent call last):
RuntimeError: generator ignored GeneratorExit
"""
try:
yield
except GeneratorExit:
yield
def check_throw():
"""
>>> x = check_throw()
>>> x.throw(ValueError)
Traceback (most recent call last):
ValueError
>>> next(x)
Traceback (most recent call last):
StopIteration
>>> x = check_throw()
>>> next(x)
>>> x.throw(ValueError)
>>> next(x)
>>> x.throw(IndexError, "oops")
Traceback (most recent call last):
IndexError: oops
>>> next(x)
Traceback (most recent call last):
StopIteration
"""
while True:
try:
yield
except ValueError:
pass
def check_yield_in_except():
"""
>>> if sys.version_info[0] == 2: sys.exc_clear()
>>> try:
... raise TypeError("RAISED !")
... except TypeError as orig_exc:
... assert isinstance(orig_exc, TypeError), orig_exc
... g = check_yield_in_except()
... print(orig_exc is sys.exc_info()[1] or sys.exc_info())
... next(g)
... print(orig_exc is sys.exc_info()[1] or sys.exc_info())
... next(g)
... print(orig_exc is sys.exc_info()[1] or sys.exc_info())
True
True
True
>>> next(g)
Traceback (most recent call last):
StopIteration
"""
try:
yield
raise ValueError
except ValueError as exc:
assert sys.exc_info()[1] is exc, sys.exc_info()
yield
if cython.compiled or sys.version_info[0] > 2:
assert sys.exc_info()[1] is exc, sys.exc_info()
def yield_in_except_throw_exc_type():
"""
>>> g = yield_in_except_throw_exc_type()
>>> next(g)
>>> g.throw(TypeError)
Traceback (most recent call last):
TypeError
>>> next(g)
Traceback (most recent call last):
StopIteration
"""
try:
raise ValueError
except ValueError as exc:
assert sys.exc_info()[1] is exc, sys.exc_info()
yield
assert sys.exc_info()[1] is exc, sys.exc_info()
def yield_in_except_throw_instance():
"""
>>> g = yield_in_except_throw_instance()
>>> next(g)
>>> g.throw(TypeError())
Traceback (most recent call last):
TypeError
>>> next(g)
Traceback (most recent call last):
StopIteration
"""
try:
raise ValueError
except ValueError as exc:
assert sys.exc_info()[1] is exc, sys.exc_info()
yield
assert sys.exc_info()[1] is exc, sys.exc_info()
def test_swap_assignment():
"""
>>> gen = test_swap_assignment()
>>> next(gen)
(5, 10)
>>> next(gen)
(10, 5)
"""
x,y = 5,10
yield (x,y)
x,y = y,x # no ref-counting here
yield (x,y)
class Foo(object):
"""
>>> obj = Foo()
>>> list(obj.simple(1, 2, 3))
[1, 2, 3]
"""
def simple(self, *args):
for i in args:
yield i
def test_nested(a, b, c):
"""
>>> obj = test_nested(1, 2, 3)
>>> [i() for i in obj]
[1, 2, 3, 4]
"""
def one():
return a
def two():
return b
def three():
return c
def new_closure(a, b):
def sum():
return a + b
return sum
yield one
yield two
yield three
yield new_closure(a, c)
def tolist(func):
def wrapper(*args, **kwargs):
return list(func(*args, **kwargs))
return wrapper
@tolist
def test_decorated(*args):
"""
>>> test_decorated(1, 2, 3)
[1, 2, 3]
"""
for i in args:
yield i
def test_return(a):
"""
>>> d = dict()
>>> obj = test_return(d)
>>> next(obj)
1
>>> next(obj)
Traceback (most recent call last):
StopIteration
>>> d['i_was_here']
True
"""
yield 1
a['i_was_here'] = True
return
def test_copied_yield(foo):
"""
>>> class Manager(object):
... def __enter__(self):
... return self
... def __exit__(self, type, value, tb):
... pass
>>> list(test_copied_yield(Manager()))
[1]
"""
with foo:
yield 1
def test_nested_yield():
"""
>>> obj = test_nested_yield()
>>> next(obj)
1
>>> obj.send(2)
2
>>> obj.send(3)
3
>>> obj.send(4)
Traceback (most recent call last):
StopIteration
"""
yield (yield (yield 1))
def test_sum_of_yields(n):
"""
>>> g = test_sum_of_yields(3)
>>> next(g)
(0, 0)
>>> g.send(1)
(0, 1)
>>> g.send(1)
(1, 2)
"""
x = 0
x += yield (0, x)
x += yield (0, x)
yield (1, x)
def test_nested_gen(n):
"""
>>> [list(a) for a in test_nested_gen(5)]
[[], [0], [0, 1], [0, 1, 2], [0, 1, 2, 3]]
"""
for a in range(n):
yield (b for b in range(a))
def test_lambda(n):
"""
>>> [i() for i in test_lambda(3)]
[0, 1, 2]
"""
for i in range(n):
yield lambda : i
def test_generator_cleanup():
"""
>>> g = test_generator_cleanup()
>>> del g
>>> g = test_generator_cleanup()
>>> next(g)
1
>>> del g
cleanup
"""
try:
yield 1
finally:
print('cleanup')
def test_del_in_generator():
"""
>>> [ s for s in test_del_in_generator() ]
['abcabcabc', 'abcabcabc']
"""
x = len('abc') * 'abc'
a = x
yield x
del x
yield a
del a
@cython.test_fail_if_path_exists("//IfStatNode", "//PrintStatNode")
def test_yield_in_const_conditional_false():
"""
>>> list(test_yield_in_const_conditional_false())
[]
"""
if False:
print((yield 1))
@cython.test_fail_if_path_exists("//IfStatNode")
@cython.test_assert_path_exists("//PrintStatNode")
def test_yield_in_const_conditional_true():
"""
>>> list(test_yield_in_const_conditional_true())
None
[1]
"""
if True:
print((yield 1))
def test_generator_scope():
"""
Tests that the function is run at the correct time
(i.e. when the generator is created, not when it's run)
>>> list(test_generator_scope())
inner running
generator created
[0, 10]
"""
def inner(val):
print("inner running")
return [0, val]
gen = (a for a in inner(10))
print("generator created")
return gen
|
