I don’t fully understand what is going on here. Why does the returned string from repr evaluate to False? If anyone can expand on what I’m not understanding here, that would be really appreciated.
class Bag(object): def __init__(self, iter_vals = []): self.iter_vals = iter_vals def __repr__(self): return f"Bag({str(self.iter_vals)})" if __name__ == '__main__': b = Bag(['d','a','b','d','c','b','d']) print(eval(repr(b)) == b) >>> False
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Answer
You also need to define an __eq__
method to define how a Bag
is equal to another Bag
:
class Bag(object): def __init__(self, iter_vals = []): self.iter_vals = iter_vals def __repr__(self): return f"Bag({str(self.iter_vals)})" def __eq__(self, other): if not isinstance(other,Bag): raise TypeError('not a Bag') return self.iter_vals == other.iter_vals if __name__ == '__main__': b = Bag(['d','a','b','d','c','b','d']) print(eval(repr(b)) == b) # True