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# yield-from a user-defined generator with a throw() method
class Iter:
def __iter__(self):
return self
def __next__(self):
return 1
def throw(self, x):
print('throw', x)
return 456
def gen():
yield from Iter()
# calling close() should not call throw()
g = gen()
print(next(g))
g.close()
# can throw a non-exception object
g = gen()
print(next(g))
print(g.throw(123))
# throwing an exception class just injects that class
g = gen()
print(next(g))
print(g.throw(ZeroDivisionError))
# this user-defined generator doesn't have a throw() method
class Iter2:
def __iter__(self):
return self
def __next__(self):
return 1
def gen2():
yield from Iter2()
# the thrown ValueError is not intercepted by the user class
g = gen2()
print(next(g))
try:
g.throw(ValueError)
except:
print('ValueError')
# the thrown 123 is not an exception so raises a TypeError
g = gen2()
print(next(g))
try:
g.throw(123)
except TypeError:
print('TypeError')
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