'SyntaxError: invalid syntax' in python 3 IDLE

Question

Why is this a syntax error? And how do I fix it?

class Queue:

    #Queue is basicliy a List:
    def __init__(self):
        self.queue = []

    #add to the top of the list (the left side)
    def Enqueue(self, num):
        if isinstance(num, int):
            self.queue.append(num)

    #remove from the top of the list and return it to user
    def Dequeue(self):
        return self.queue.pop(0)

#this function gets inputs from user, and adds them to queue,
#until it gets 0.
def addToQueue(queue, num):
    num = input()
    while num != 0:
        queue.Enqueue(num)
        num = input()

Please paste the actual code, not a screenshot of the code.

Ry-
– Ry- ♦

2012-04-28 22:29:23 +00:00
Commented Apr 28, 2012 at 22:29 — Ry-
– Ry- ♦, Commented Apr 28, 2012 at 22:29

Raymond Hettinger · Accepted Answer · 2012-04-28 22:32:46Z

2

The interactive mode (with the >>> prompt) only accepts one statement at a time. You've entered two to be processed at once.

After you've entered the class definition, be sure to add an extra blank line so that the interactive prompt knows you're done. Once you're prompted with a >>>, you'll know it is ready for the function definition.

The rest of your code looks fine. Happy computing :-)

answered Apr 28, 2012 at 22:32

Raymond Hettinger

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1 Comment

user1026554 Over a year ago

Tnx! But if I have the entire code in one '*.py' file, it should be fine?

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