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"""List-related functions"""
def unlist(list_thing, complain=True):
"""transforms [Something] -> Something. By default, raises a ValueError for
any other list values."""
if complain and len(list_thing) > 1:
raise ValueError("More than one element in {}".format(list_thing))
elif len(list_thing) == 1:
return list_thing[0]
if complain:
raise ValueError("Nothing in {}".format(list_thing))
return None
def flatten(iterable):
"""Fully flattens an iterable:
In: flatten([1,2,3,4,[5,6,[7,8]]])
Out: [1,2,3,4,5,6,7,8]
"""
container = iterable.__class__
placeholder = []
for item in iterable:
try:
placeholder.extend(flatten(item))
except TypeError:
placeholder.append(item)
return container(placeholder)
def flat_map(iterable, func):
"""func must take an item and return an interable that contains that
item. this is flatmap in the classic mode"""
results = []
for element in iterable:
result = func(element)
if len(result) > 0:
results.extend(result)
return results
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