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Update queue-linked-list-impl.py

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Original file line number	Diff line number	Diff line change
`@@ -29,6 +29,11 @@ def dequeue(self):`
`29`	`29`	`self._count -= 1`
`30`	`30`	`return ret_value.key`
`31`	`31`
	`32`	`+ def peek(self):`
	`33`	`+ if self.is_empty():`
	`34`	`+ raise Exception("Queue is empty")`
	`35`	`+ return self._head.key`
	`36`	`+`
`32`	`37`	`def size(self) -> int:`
`33`	`38`	`return self._count`
`34`	`39`

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