[Tutor] python errors

[ALAN GAULD]

From: keith papa <keithadu at live.com>
>To: Alan Gauld <alan.gauld at btinternet.com> 
>Sent: Monday, 14 April 2014, 18:19
>Subject: RE: [Tutor] python errors
> 
>
>
> 
>>>> x = "foo" - 4
>
>
>Traceback (most recent call last):
>  File "<pyshell#0>", line 1, in <module>
>    x = "foo" - 4
>TypeError: unsupported operand type(s) for -: 'str' and 'int'
>>>> 
>
>That's right, its a semantic error. You  shouldn't be trying to subtract a number 
from a string. It's not a meaningful thing to do,

The Python errors are not categorised into syntactic, semantic and runtime
error types, (although there is a syntax error exception). Those are computer 
science concepts not explicitly exposed by Python. Python just reports an 
error as above.

Alan g.
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