Commit 3c2b2acd authored by Paul Sokolovsky's avatar Paul Sokolovsky
Browse files

tests: Add testcases for yield from.

parent 55234f46
def gen():
yield 1
yield 2
yield 3
yield 4
def gen2():
yield -1
print((yield from gen()))
yield 10
yield 11
g = gen2()
print(next(g))
print(next(g))
g.close()
try:
print(next(g))
except StopIteration:
print("StopIteration")
# Now variation of same test, but with leaf generator
# swallowing GeneratorExit exception - its upstream gen
# generator should still receive one.
def gen3():
yield 1
try:
yield 2
except GeneratorExit:
print("leaf caught GeneratorExit and swallowed it")
return
yield 3
yield 4
def gen4():
yield -1
try:
print((yield from gen3()))
except GeneratorExit:
print("delegating caught GeneratorExit")
raise
yield 10
yield 11
g = gen4()
print(next(g))
print(next(g))
print(next(g))
g.close()
try:
print(next(g))
except StopIteration:
print("StopIteration")
# Yet another variation - leaf generator gets GeneratorExit,
# but raises StopIteration instead. This still should close chain properly.
def gen5():
yield 1
try:
yield 2
except GeneratorExit:
print("leaf caught GeneratorExit and raised StopIteration instead")
raise StopIteration(123)
yield 3
yield 4
def gen6():
yield -1
try:
print((yield from gen5()))
except GeneratorExit:
print("delegating caught GeneratorExit")
raise
yield 10
yield 11
g = gen6()
print(next(g))
print(next(g))
print(next(g))
g.close()
try:
print(next(g))
except StopIteration:
print("StopIteration")
def gen():
yield 1
yield 2
raise ValueError
def gen2():
try:
print((yield from gen()))
except ValueError:
print("caught ValueError from downstream")
g = gen2()
print(list(g))
def gen():
print("sent:", (yield 1))
yield 2
def gen2():
print((yield from gen()))
g = gen2()
next(g)
print("yielded:", g.send("val"))
try:
next(g)
except StopIteration:
print("StopIteration")
def gen():
try:
yield 1
except ValueError:
print("got ValueError from upstream!")
yield "str1"
raise TypeError
def gen2():
print((yield from gen()))
g = gen2()
print(next(g))
print(g.throw(ValueError))
try:
print(next(g))
except TypeError:
print("got TypeError from downstream!")
# Case of terminating subgen using return with value
def gen():
yield 1
yield 2
return 3
def gen2():
print("here1")
print((yield from gen()))
print("here2")
g = gen2()
print(list(g))
# Like above, but terminate subgen using StopIteration
def gen3():
yield 1
yield 2
raise StopIteration
def gen4():
print("here1")
print((yield from gen3()))
print("here2")
g = gen4()
print(list(g))
# Like above, but terminate subgen using StopIteration with value
def gen5():
yield 1
yield 2
raise StopIteration(123)
def gen6():
print("here1")
print((yield from gen5()))
print("here2")
g = gen6()
print(list(g))
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