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(python2.1-tut.info)Syntax Errors

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Syntax Errors
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Syntax errors, also known as parsing errors, are perhaps the most common
kind of complaint you get while you are still learning Python:

     >>> while 1 print 'Hello world'
       File "<stdin>", line 1
         while 1 print 'Hello world'
                     ^
     SyntaxError: invalid syntax

The parser repeats the offending line and displays a little `arrow'
pointing at the earliest point in the line where the error was
detected.  The error is caused by (or at least detected at) the token
_preceding_ the arrow: in the example, the error is detected at the
keyword `print', since a colon (`:') is missing before it.  File name
and line number are printed so you know where to look in case the input
came from a script.