`{}.get()`
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: get expected at least 1 arguments, got 0

Shouldn't that be "TypeError: get expected at least 1 argument, got 0" instead?

Yes.  0 things, (1/2 thing), 1 thing, (3/2 things),  2... things is the bugaboo of formatting sentences with a number field.  Raymond, will we accept a patch for this?

Another test case: 

>> classmethod()

Traceback (most recent call last):
  File "<pyshell#25>", line 2, in check
TypeError: classmethod expected 1 arguments, got 0

Is this still active? I want to fix the patch.

> Raymond, will we accept a patch for this?

If the patch is simple and minimal, then this seems like a minor but nice little improvement.

I have added a simple patch based on the changes by https://bugs.python.org/issue29951. The C code related error messages doesn't seem to have been covered by tests and I have added some tests. I have limited knowledge of C and this is my first C patch so code comments if any will be helpful.

Thanks

We don't normally backport an exception message change unless its content, as opposed to style, is erroneous.

New changeset 1426daa4fe47d8f8be0d416f7cba7adae1d5839f by Raymond Hettinger (Xtreak) in branch 'master':
bpo-34127: Fix grammar in error message with respect to argument count (GH-8395)
https://github.com/python/cpython/commit/1426daa4fe47d8f8be0d416f7cba7adae1d5839f

Nice work.  Thanks for the patch.

Thanks, I have created https://bugs.python.org/issue34193 to address PR comments and further enhancements in getargs.c