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unfold python Code Snippet in 2022

functionlistadvanced

Last Updated: 25 September 2022

Builds a list, using an iterator function and an initial seed value.

  • The iterator function accepts one argument (seed) and must always return a list with two elements ([value, nextSeed]) or False to terminate.
  • Use a generator function, fn_generator, that uses a while loop to call the iterator function and yield the value until it returns False.
  • Use a list comprehension to return the list that is produced by the generator, using the iterator function.
def unfold(fn, seed): def fn_generator(val): while True: val = fn(val[1]) if val == False: break yield val[0] return [i for i in fn_generator([None, seed])]
f = lambda n: False if n > 50 else [-n, n + 10] unfold(f, 10) # [-10, -20, -30, -40, -50]

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