REF: avoid runtime import of Index (#32710)

jbrockmendel · web-flow · commit bab3b1fcbd2c · 2020-03-14T20:31:43.000-04:00
diff --git a/pandas/core/algorithms.py b/pandas/core/algorithms.py
@@ -2025,9 +2025,7 @@ def sort_mixed(values):
         )
     codes = ensure_platform_int(np.asarray(codes))
 
-    from pandas import Index
-
-    if not assume_unique and not Index(values).is_unique:
+    if not assume_unique and not len(unique(values)) == len(values):
         raise ValueError("values should be unique if codes is not None")
 
     if sorter is None:

Original file line number	Diff line number	Diff line change
`@@ -2025,9 +2025,7 @@ def sort_mixed(values):`
`2025`	`2025`	`)`
`2026`	`2026`	`codes = ensure_platform_int(np.asarray(codes))`
`2027`	`2027`
`2028`		`- from pandas import Index`
`2029`		`-`
`2030`		`- if not assume_unique and not Index(values).is_unique:`
	`2028`	`+ if not assume_unique and not len(unique(values)) == len(values):`
`2031`	`2029`	`raise ValueError("values should be unique if codes is not None")`
`2032`	`2030`
`2033`	`2031`	`if sorter is None:`