def sequence(monad_t, monad_list):
"""Evaluates each action in sequence from left to right and
collects the results."""
def helper(monad, acc):
"Helper for sequence."
return monad >= (lambda x: (acc >= (lambda xs: (monad_t.return_m(xs + [x])))))
return func.foldr(helper, monad_t.return_m([]), list(reversed(monad_list)))
def sequence(monad_t, monad_list):
"""Evaluates each action in sequence from left to right and
collects the results."""
def helper(monad, acc):
"Helper for sequence."
return monad >= (lambda x: (acc >= (lambda xs:
(monad_t.return_m(xs + [x])))))
return func.foldr(helper, monad_t.return_m([]), list(reversed(monad_list)))
def sequence_(monad_t, monad_list):
"""Evaluates each action in sequence from
left to right and dumps the results."""
return func.foldr(monad_t.then, monad_t.return_m(func.Unit()), monad_list)
def msum(monad_t, monad_list):
"Generalized concatenation."
return func.foldr(monad_t.mplus(), monad_t.mzero(), monad_list)
def sequence_(monad_t, monad_list):
"""Evaluates each action in sequence from
left to right and dumps the results."""
return func.foldr(monad_t.then, monad_t.return_m(func.Unit()), monad_list)
def msum(monad_t, monad_list):
"Generalized concatenation."
return func.foldr(monad_t.mplus(), monad_t.mzero(), monad_list)