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|
# mode: run
# tag: generators, gh3265
try:
import backports_abc
except ImportError: pass
else: backports_abc.patch()
try:
from collections.abc import Generator
except ImportError:
try:
from collections import Generator
except ImportError:
Generator = object # easy win
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 attributes():
"""
>>> x = attributes()
>>> x.__name__
'attributes'
>>> x.__qualname__
'attributes'
>>> x.gi_running # before next()
False
>>> inner = next(x)
>>> x.gi_running # after next()
False
>>> next(x)
Traceback (most recent call last):
StopIteration
>>> x.gi_running # after termination
False
>>> y = inner()
>>> y.__name__
'<lambda>'
>>> y.__qualname__
'attributes.<locals>.inner.<locals>.<lambda>'
>>> y.__name__ = 123
Traceback (most recent call last):
TypeError: __name__ must be set to a string object
>>> y.__name__
'<lambda>'
>>> y.__qualname__ = None
Traceback (most recent call last):
TypeError: __qualname__ must be set to a string object
>>> y.__qualname__
'attributes.<locals>.inner.<locals>.<lambda>'
>>> y.__name__ = 'abc'
>>> y.__name__
'abc'
>>> y.__name__ = None
Traceback (most recent call last):
TypeError: __name__ must be set to a string object
>>> y.__name__
'abc'
>>> y.__qualname__ = 'huhu'
>>> y.__qualname__
'huhu'
>>> y.__qualname__ = 123
Traceback (most recent call last):
TypeError: __qualname__ must be set to a string object
>>> y.__qualname__
'huhu'
"""
def inner():
return (lambda : (yield 1))
yield inner()
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 with_outer_raising(*args):
"""
>>> x = with_outer_raising(1, 2, 3)
>>> list(x())
[1, 2, 3]
"""
def generator():
for i in args:
yield i
raise StopIteration
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 test_first_assignment():
"""
>>> gen = test_first_assignment()
>>> next(gen)
5
>>> next(gen)
10
>>> next(gen)
(5, 10)
"""
cdef x = 5 # first
yield x
cdef y = 10 # first
yield y
yield (x,y)
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 generator_nonlocal():
"""
>>> g = generator_nonlocal()
>>> list(g(5))
[2, 3, 4, 5, 6]
"""
def f(x):
def g(y):
nonlocal x
for i in range(y):
x += 1
yield x
return g
return f(1)
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_return_in_finally(a):
"""
>>> d = dict()
>>> obj = test_return_in_finally(d)
>>> next(obj)
1
>>> next(obj)
Traceback (most recent call last):
StopIteration
>>> d['i_was_here']
True
>>> d = dict()
>>> obj = test_return_in_finally(d)
>>> next(obj)
1
>>> obj.send(2)
Traceback (most recent call last):
StopIteration
>>> d['i_was_here']
True
>>> obj = test_return_in_finally(None)
>>> next(obj)
1
>>> next(obj)
Traceback (most recent call last):
StopIteration
>>> obj = test_return_in_finally(None)
>>> next(obj)
1
>>> obj.send(2)
Traceback (most recent call last):
StopIteration
"""
yield 1
try:
a['i_was_here'] = True
finally:
return
def test_return_none_in_finally(a):
"""
>>> d = dict()
>>> obj = test_return_none_in_finally(d)
>>> next(obj)
1
>>> next(obj)
Traceback (most recent call last):
StopIteration
>>> d['i_was_here']
True
>>> obj = test_return_none_in_finally(None)
>>> next(obj)
1
>>> next(obj)
Traceback (most recent call last):
StopIteration
"""
yield 1
try:
a['i_was_here'] = True
finally:
return None
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_inside_lambda():
"""
>>> obj = test_inside_lambda()()
>>> next(obj)
1
>>> next(obj)
2
>>> next(obj)
Traceback (most recent call last):
StopIteration
"""
return lambda:((yield 1), (yield 2))
def test_nested_gen(int 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_with_gil_section():
"""
>>> list(test_with_gil_section())
[0, 1, 2]
"""
cdef int i
with nogil:
for i in range(3):
with gil:
yield i
def test_double_with_gil_section():
"""
>>> list(test_double_with_gil_section())
[0, 1, 2, 3]
"""
cdef int i,j
with nogil:
for i in range(2):
with gil:
with nogil:
for j in range(2):
with gil:
yield i*2+j
with nogil:
pass
with gil:
pass
def test_generator_abc():
"""
>>> isinstance(test_generator_abc(), Generator)
True
>>> try:
... from collections.abc import Generator
... except ImportError:
... try:
... from collections import Generator
... except ImportError:
... Generator = object # easy win
>>> isinstance(test_generator_abc(), Generator)
True
>>> isinstance((lambda:(yield))(), Generator)
True
"""
yield 1
def test_generator_frame(a=1):
"""
>>> gen = test_generator_frame()
>>> import types
>>> isinstance(gen.gi_frame, types.FrameType) or gen.gi_frame
True
>>> gen.gi_frame is gen.gi_frame # assert that it's cached
True
>>> gen.gi_frame.f_code is not None
True
>>> code_obj = gen.gi_frame.f_code
>>> code_obj.co_argcount
1
>>> code_obj.co_varnames
('a', 'b')
"""
b = a + 1
yield b
# GH Issue 3265 - **kwds could cause a crash in some cases due to not
# handling NULL pointers (in testing it shows as a REFNANNY error).
# This was on creation of the generator and
# doesn't really require it to be iterated through:
def some_function():
return 0
def test_generator_kwds1(**kwargs):
"""
>>> for a in test_generator_kwds1():
... print(a)
0
"""
yield some_function(**kwargs)
def test_generator_kwds2(**kwargs):
"""
>>> for a in test_generator_kwds2():
... print(a)
0
"""
yield 0
def test_generator_kwds3(**kwargs):
"""
This didn't actually crash before but is still worth a try
>>> len(list(test_generator_kwds3()))
0
>>> for a in test_generator_kwds3(a=1):
... print(a)
a
"""
yield from kwargs.keys()
def test_generator_frame(a=1):
"""
>>> gen = test_generator_frame()
>>> import types
>>> isinstance(gen.gi_frame, types.FrameType) or gen.gi_frame
True
>>> gen.gi_frame is gen.gi_frame # assert that it's cached
True
>>> gen.gi_frame.f_code is not None
True
>>> code_obj = gen.gi_frame.f_code
>>> code_obj.co_argcount
1
>>> code_obj.co_varnames
('a', 'b')
"""
b = a + 1
yield b
|
