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PO'Queue' object has no attribute 'size'
 

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    <p>I have seen other examples of this happening on StackOverflow, but I didn't understand any of the answers (I'm still a new programmer,) nor did the other examples I saw look quite like mine, else I wouldn't post this question.</p> <p>I'm running Python 3.2 on Windows 7.</p> <p>I have never had this happen to me before and I've done classes this way many times, so I don't really know what is different this time. The only difference is that I didn't make all of the Class file; I was given a template to fill in and a test file to try it on. It worked on the test file, but is not working on my file. I have been calling on the methods in the class in the exact same way as the test file (e.g. Lineup.size())</p> <p>This is my Class:</p> <pre> class Queue: # Constructor, which creates a new empty queue: def __init__(self): self.__items = [] # Adds a new item to the back of the queue, and returns nothing: def queue(self, item): self.__items.insert(0,item) return # Removes and returns the front-most item in the queue. # Returns nothing if the queue is empty. def dequeue(self): if len(self.__items) == 0: return None else: return self.__items.pop() # Returns the front-most item in the queue, and DOES NOT change the queue. def peek(self): if len(self.__items) == 0: return None else: return self.__items[(len(self.__items)-1)] # Returns True if the queue is empty, and False otherwise: def is_empty(self): return len(self.__items) == 0 # Returns the number of items in the queue: def size(self): return len(self.__items) # Removes all items from the queue, and sets the size to 0: def clear(self): del self.__items[0:len(self.__items)] return # Returns a string representation of the queue: def __str__(self): return "".join(str(i) for i in self.__items) </pre> <p>This is my program:</p> <pre><code>from queue import Queue Lineup = Queue() while True: decision = str(input("Add, Serve, or Exit: ")).lower() if decision == "add": if Lineup.size() == 3: print("There cannot be more than three people in line.") continue else: person = str(input("Enter the name of the person to add: ")) Lineup.queue(person) continue elif decision == "serve": if Lineup.is_empty() == True: print("The lineup is already empty.") continue else: print("%s has been served."%Lineup.peek()) Lineup.dequeue() continue elif (decision == "exit") or (decision == "quit"): break else: print("%s is not a valid command.") continue </code></pre> <p>And this is my error message when I enter "add" as my decision variable:</p> <p><em>line 8, in builtins.AttributeError: 'Queue' object has no attribute 'size'</em></p> <p>So, what is going on here? What is different about this one?</p>
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    1. COit seems you are importing the builtin `queue` module rather than your own. Try checking what `queue.__file__` is set to.
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    2. COPython 3 already contains a `queue` module. Rename your `queue.py` to `my_queue.py` and your code should work.
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    3. COOh wow... how did I not notice that? haha. Thank you. That fixed it. You should "answer this question" so I can give either of you a thumbs up and a checkmark.
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