[Tutor] What's the invalid syntax? [What's the error mesaage?]
falcon3166 at hotmail.com
Sun Jul 10 20:28:21 CEST 2005
I fixed this bug by myself, I had forgotten to add a print on a line by
----- Original Message -----
From: "Danny Yoo" <dyoo at hkn.eecs.berkeley.edu>
To: "Nathan Pinno" <falcon3166 at hotmail.com>
Cc: <tutor at python.org>
Sent: Sunday, July 10, 2005 12:29 AM
Subject: Re: [Tutor] What's the invalid syntax? [What's the error
> On Sat, 9 Jul 2005, Nathan Pinno wrote:
>> What's the invalid syntax?
>> Here's the code (Part of my Guess the Numbers game):
>> if a0 == x0 and a1 == x1 and a2 == x2 and a3 == x3:
>> print "Congratulations! Way to go?"
>> answer = raw input("Play again: (Y)es or (N)o Type the
letter of your choice. ")
> Hi Nathan,
> Next time you ask this kind of question, show us the error message.
> Brian has asked you before on other questions in the past; his
> recommendation is a good one in general.
> Error message are not content-less, despite what you might think. They
> usually have some kind of useful information associated with them, and
> they they really often provide key clues to what's broken.
> Let's try an example to demonstrate this idea. Let's say that we write
> program like this:
> def test_syntax_error():
> print "hello world"
> goodbye world
> When we run this, Python says that there's a problem here. But it
> actually says more than "it doesn't work"; it gets specific:
> File "<stdin>", line 3
> goodbye world
> SyntaxError: invalid syntax
> Python is saying: "Up to line 2 of the program, things look
> ok. I, the Python system, hit a problem on line three. Here, I'll show
> the line to you; maybe you'll see what's wrong immediately. Look around
> there for the syntax error. If it helps here's more info: I got
> as soon as I saw the word 'world'; I was not expecting that word there."
> Of course, if Python really did say something like that in full English,
> it would be too verbose. So it does take some practice in reading
> something terse like an error message, and actually understanding what
> means. But many of us on the tutor list have that experience.
> I hope this makes it clear: if you see an error message, include it!
> It's actually really useful for us when we try to help you with
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