CLN: remove duplicated code

Author: jreback

pandas/core/algorithms.py

@@ -64,6 +64,10 @@ def _ensure_data(values, dtype=None):
 
  """
 
+ # short-circuit on object dtype requested
+ if is_object_dtype(dtype):
+ return _ensure_object(values), 'object', 'object'
+
  # we check some simple dtypes first
  try:
  if is_bool_dtype(values) or is_bool_dtype(dtype):
@@ -161,6 +165,7 @@ def _ensure_arraylike(values):
  """
  if not isinstance(values, (np.ndarray, ABCCategorical,
  ABCIndexClass, ABCSeries)):
+ values = list(values)
  inferred = lib.infer_dtype(values)
  if inferred in ['mixed', 'string', 'unicode']:
  values = lib.list_to_object_array(values)
@@ -392,10 +397,9 @@ def isin(comps, values):
  " to isin(), you passed a "
  "[{0}]".format(type(values).__name__))
 
- if not isinstance(values, (ABCIndex, ABCSeries, np.ndarray)):
- values = lib.list_to_object_array(list(values))
-
+ comps = _ensure_arraylike(comps)
  comps, dtype, _ = _ensure_data(comps)
+ values = _ensure_arraylike(values)
  values, _, _ = _ensure_data(values, dtype=dtype)
 
  # GH11232