Fixes for @jreback review

pandas/core/nanops.py

@@ -62,7 +62,7 @@ def _f(*args, **kwargs):
             if any(self.check(obj) for obj in obj_iter):
                 f_name = f.__name__.replace("nan", "")
                 raise TypeError(
-                    f"reduction operation {repr(f_name)} not allowed for this dtype"
+                    f"reduction operation '{f_name}' not allowed for this dtype"
                 )
             try:
                 with np.errstate(invalid="ignore"):

pandas/core/reshape/concat.py

@@ -542,8 +542,8 @@ def _get_concat_axis(self) -> Index:
                 for i, x in enumerate(self.objs):
                     if not isinstance(x, Series):
                         raise TypeError(
-                            f"Cannot concatenate type 'Series' with object "
-                            f"of type {repr(type(x).__name__)}"
+                            f"Cannot concatenate type 'Series' with "
+                            f"object of type '{type(x).__name__}"
                         )
                     if x.name is not None:
                         names[i] = x.name

pandas/core/sorting.py

@@ -208,7 +208,7 @@ def lexsort_indexer(keys, orders=None, na_position="last"):
             cat = Categorical(key, ordered=True)
 
         if na_position not in ["last", "first"]:
-            raise ValueError(f"invalid na_position: {repr(na_position)}")
+            raise ValueError(f"invalid na_position: '{na_position}'")
 
         n = len(cat.categories)
         codes = cat.codes.copy()

pandas/core/strings.py

@@ -1933,8 +1933,8 @@ def _forbid_nonstring_types(func):
         def wrapper(self, *args, **kwargs):
             if self._inferred_dtype not in allowed_types:
                 msg = (
-                    f"Cannot use .str.{func_name} with values of inferred dtype "
-                    f"{repr(self._inferred_dtype)}."
+                    f"Cannot use .str.{func_name} with values of "
+                    f"inferred dtype '{self._inferred_dtype}'."
                 )
                 raise TypeError(msg)
             return func(self, *args, **kwargs)