Subclass list instead of typing.List.

This is temporary, until pylint-dev/pylint#3129 is resolved.

Author: Attila Oláh

poly/int_p.py

@@ -4,7 +4,9 @@
 from poly.int_t import IntT
 
 
-class IntP(List[IntT]):
+# TODO: Subclass typing.List[IntT] when pylint supports this.
+# See https://github.com/PyCQA/pylint/issues/3129.
+class IntP(list):
     """A polynomial with int terms and coefficients.
 
     This type implements a sparse representation, i.e. only non-zero terms are

poly/int_t.py

@@ -2,7 +2,9 @@
 from typing import Iterable, List, Union
 
 
-class Ind(List[int]):
+# TODO: Subclass typing.List[int] when pylint supports this.
+# See https://github.com/PyCQA/pylint/issues/3129.
+class Ind(list):
     """Ind represents the indeterminates of a single term."""
 
     def __init__(self, *args: int) -> None: