Only check against Iterable in is_list_like and add test for str

Author: huashuai

doc/source/whatsnew/v0.21.0.txt

@@ -517,7 +517,7 @@ Indexing
 - Bug in ``CategoricalIndex`` reindexing in which specified indices containing duplicates were not being respected (:issue:`17323`)
 - Bug in intersection of ``RangeIndex`` with negative step (:issue:`17296`)
 - Bug in ``IntervalIndex`` where performing a scalar lookup fails for included right endpoints of non-overlapping monotonic decreasing indexes (:issue:`16417`, :issue:`17271`)
-- Bug in ``Series.rename`` when called with a `callable` alters name of series rather than index of series. (:issue:`17407`)
+- Bug in :func:`Series.rename` when called with a `callable`, incorrectly alters the name of the `Series`, rather than the name of the `Index`. (:issue:`17407`)
 
 I/O
 ^^^

pandas/core/dtypes/inference.py

@@ -263,7 +263,7 @@ def is_list_like(obj):
     False
     """
 
-    return (hasattr(obj, '__iter__') and isinstance(obj, Iterable) and
+    return (isinstance(obj, Iterable) and
             not isinstance(obj, string_and_binary_types))
 
 

pandas/tests/dtypes/test_inference.py

@@ -58,7 +58,7 @@ def __getitem__(self):
 def test_is_list_like():
     passes = ([], [1], (1, ), (1, 2), {'a': 1}, set([1, 'a']), Series([1]),
               Series([]), Series(['a']).str)
-    fails = (1, '2', object())
+    fails = (1, '2', object(), str)
 
     for p in passes:
         assert inference.is_list_like(p)