Trivial bug fix: deque == [] is not a good way to check if a deque is empty.
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@ -259,7 +259,7 @@ class fifo:
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return len(self.list)
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return len(self.list)
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def is_empty (self):
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def is_empty (self):
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return self.list == []
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return not self.list
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def first (self):
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def first (self):
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return self.list[0]
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return self.list[0]
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