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# case where generator doesn't intercept the thrown/injected exception
def gen():
yield 123
yield 456
g = gen()
print(next(g))
try:
g.throw(KeyError)
except KeyError:
print('got KeyError from downstream!')
# case where a thrown exception is caught and stops the generator
def gen():
try:
yield 1
yield 2
except:
pass
g = gen()
print(next(g))
try:
g.throw(ValueError)
except StopIteration:
print('got StopIteration')
# generator ignores a thrown GeneratorExit (this is allowed)
def gen():
try:
yield 123
except GeneratorExit as e:
print('GeneratorExit', repr(e.args))
yield 456
# thrown a class
g = gen()
print(next(g))
print(g.throw(GeneratorExit))
# thrown an instance
g = gen()
print(next(g))
print(g.throw(GeneratorExit()))
# thrown an instance with None as second arg
g = gen()
print(next(g))
print(g.throw(GeneratorExit(), None))
# thrown a class and instance
g = gen()
print(next(g))
print(g.throw(GeneratorExit, GeneratorExit(123)))
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