Get rid of series.nonzero in test_reindex_level

Author: makbigc

pandas/tests/frame/test_indexing.py

@@ -2176,7 +2176,7 @@ def test_reindex_level(self):
 
         def verify_first_level(df, level, idx, check_index_type=True):
             def f(val):
-                return np.nonzero(df[level] == val)[0]
+                return np.nonzero((df[level] == val).values)[0]
             i = np.concatenate(list(map(f, idx)))
             left = df.set_index(icol).reindex(idx, level=level)
             right = df.iloc[i].set_index(icol)