etc404
21 lines
648 B
Python
21 lines
648 B
Python
class Atom:
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car: Atom | int | str | bool | None
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cdr: Atom | None
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def __init__(self, car: Atom|int|str|bool|None, cdr: Atom|None):
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self.car = car
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self.cdr = cdr
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def setval(self, atom: Atom | int | str | bool | None):
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self.car = atom
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def append(self, atom: Atom):
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self.cdr = atom
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def __str__(self):
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if type(self.car) is Atom:
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return "(" + self.car.__str__() + ("" if self.cdr is None else (" " + self.cdr.__str__())) + ")"
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elif self.car is None:
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return "()"
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else:
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return self.car + ("" if self.cdr is None else self.cdr.__str__()) |