pocketpy/tests/45_yield.py
2024-01-05 22:02:23 +08:00

90 lines
1.2 KiB
Python

def f(n):
for i in range(n):
yield i
x = 0
for j in f(5):
x += j
assert x == 10
a = [i for i in f(6)]
assert a == [0,1,2,3,4,5]
def f(n):
for i in range(n):
for j in range(n):
yield i, j
a = [i for i in f(3)]
assert len(a) == 9
assert a[0] == (0,0)
assert a[1] == (0,1)
assert a[2] == (0,2)
assert a[3] == (1,0)
assert a[4] == (1,1)
assert a[5] == (1,2)
assert a[6] == (2,0)
assert a[7] == (2,1)
assert a[8] == (2,2)
def g():
yield from [1, 2, 3]
def f():
yield from g()
a = [i for i in f()]
assert a == [1, 2, 3]
def f(n):
for i in range(n):
yield i
for j in range(i):
yield j
t = f(3)
assert list(t) == [0, 1, 0, 2, 0, 1]
def f(n):
for i in range(n):
if i == n-1:
raise ValueError
yield i
t = f(3)
t = iter(t)
assert next(t) == 0
assert next(t) == 1
try:
next(t)
exit(1)
except ValueError:
pass
assert next(t) == StopIteration
def f():
yield 1
yield 2
return
yield 3
assert list(f()) == [1, 2]
src = '''
def g():
yield 1
yield 2
return 3
yield 4
'''
try:
exec(src)
exit(1)
except SyntaxError:
pass