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- """Functions that are nice to have but really should be in the python std lib"""
- def flatten(xs):
- """Recursively flattens a list of lists of lists (arbitrarily, non-uniformly
- deep) into a single big list."""
- res = []
- def loop(ys):
- for i in ys:
- if isinstance(i, list): loop(i)
- elif i is None: pass
- else: res.append(i)
- loop(xs)
- return res
- def singleton(cls):
- """Decorates a class to turn it into a singleton."""
- obj = cls()
- obj.__name__ = cls.__name__
- return obj
- def merge_dicts(my_dicts):
- """Combines a bunch of dictionaries together, later dictionaries taking
- precedence if there is a key conflict"""
- return dict((k,v) for d in my_dicts for (k,v) in d.items())
- class Lazy:
- def __init__(self, thunk):
- self.thunk = thunk
- self.val = None
- def __call__(self):
- if self.val is None:
- self.val = [self.thunk()]
- return self.val[0]
- def distinct(l):
- """Builds a new list with all duplicates removed"""
- s = []
- for i in l:
- if i not in s:
- s.append(i)
- return s
- def register(array):
- """A decorator to add things to lists without stomping over its value"""
- def x(val):
- array.append(val)
- return val
- return x
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