def test_do():
inc = lambda x: x + 1
assert do(inc, 1) == 1
log = []
assert do(log.append, 1) == 1
assert log == [1]
def test_do():
inc = lambda x: x + 1
assert do(inc, 1) == 1
log = []
assert do(log.append, 1) == 1
assert log == [1]
def tee_logfn(lgr, x):
"""
tee operator that logs and then returns x
for logging intermediate results in a
pipeline
"""
return do(lgr.info, x)
