fix pandas v2.1 issues, various

Author: topper-123

pint_pandas/pint_array.py

@@ -470,7 +470,8 @@ def take(self, indices, allow_fill=False, fill_value=None):
         Examples
         --------
         """
-        from pandas.core.algorithms import take, is_scalar
+        from pandas.core.algorithms import take
+        from pandas.api.types import is_scalar
 
         data = self._data
         if allow_fill and fill_value is None:

pint_pandas/testsuite/test_pandas_extensiontests.py

@@ -343,7 +343,7 @@ def _check_divmod_op(self, s, op, other, exc=None):
                 divmod(s, other)
 
     def _get_exception(self, data, op_name):
-        if data.data.dtype == pd.core.dtypes.dtypes.PandasDtype("complex128"):
+        if data.data.dtype == dtypemap[np.complex128]:
             if op_name in ["__floordiv__", "__rfloordiv__", "__mod__", "__rmod__"]:
                 return op_name, TypeError
         if op_name in ["__pow__", "__rpow__"]: