Issue 2961: Two error messages inconsistent (original) (raw)

Issue2961

Created on 2008-05-25 05:56 by chester, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (3)
msg67319 - (view)	Author: Chester (chester)	Date: 2008-05-25 05:56
Hello, I would like to report that two error messages of the Python parser are not consistent. Please take a look at this: >>> a = "hello" >>> a + 1 Traceback (most recent call last): File "", line 1, in TypeError: cannot concatenate 'str' and 'int' objects >>> 1 + a Traceback (most recent call last): File "", line 1, in TypeError: unsupported operand type(s) for +: 'int' and 'str' When the order of the objects is changed, that should only change the order of the 'str' and 'int' words in the message. So if a+1, then TypeError: cannot concatenate 'str' and 'int' objects and if 1+a, then TypeError: cannot concatenate 'int' and 'str' objects
msg67321 - (view)	Author: Chester (chester)	Date: 2008-05-25 06:13
For the case a + 1 I recommend: TypeError: can't concatenate 'str' and 'int' objects And for the case 1 + a I recommend: TypeError: can't concatenate 'int' and 'str' objects Consistency matters!
msg67327 - (view)	Author: Georg Brandl (georg.brandl) *	Date: 2008-05-25 08:03
I don't see a problem here. You may be mislead by the assumption that the error messages are generated by the parser, which they aren't -- they are generated at runtime by the objects you try to add. The two types report their failure to do the operation differently -- strings are usually concatenated, so the first one makes sense for strings, but ints have no such notion.