Serhiy Storchaka <[email protected]> added the comment:
Camion, the problem is not in the error message. The problem is in the complex
expression that produces an error. If you have a complex expression you always
have a change to misidentify the source of error. In your case the expression
contains two implicit iter() invocations.
I have looked at the code. It is possible to make the error message in this
case more specific. There are precedences of this when pass wrong type as
var-positional or var-keyword arguments:
>>> print(*1)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: print() argument after * must be an iterable, not int
>>> print(**1)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: print() argument after ** must be a mapping, not int
In the following cases the error message is general. It is possible to make it
more specific.
>>> a, b = 1
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> [*1]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> {*1}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not iterable
>>> {**1}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not a mapping
But PyObject_GetIter() is called in 88 places in CPython core and extensions.
In all these cases we can make error messages more specific. But I have large
doubts that it is worth to do. And I'm not sure even about the above examples.
If somebody provide a patch we could discuss it (I'm not sure it will be
accepted at end).
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<https://bugs.python.org/issue32259>
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