CLN: Move _is_sequence() from pd.frame to pd.common, with other is_*

Author: y-p

pandas/core/common.py

@@ -778,6 +778,14 @@ def is_float_dtype(arr_or_dtype):
 def is_list_like(arg):
     return hasattr(arg, '__iter__') and not isinstance(arg, basestring)
 
+def _is_sequence(x):
+    try:
+        iter(x)
+        assert(not isinstance(x, basestring))
+        return True
+    except Exception:
+        return False
+
 _ensure_float64 = _algos.ensure_float64
 _ensure_int64 = _algos.ensure_int64
 _ensure_int32 = _algos.ensure_int32

pandas/core/frame.py

@@ -25,7 +25,7 @@
 import numpy.ma as ma
 
 from pandas.core.common import (isnull, notnull, PandasError, _try_sort,
-                                _default_index, _stringify)
+                                _default_index,_stringify,_is_sequence)
 from pandas.core.generic import NDFrame
 from pandas.core.index import Index, MultiIndex, _ensure_index
 from pandas.core.indexing import _NDFrameIndexer, _maybe_droplevels
@@ -5106,14 +5106,6 @@ def _homogenize(data, index, columns, dtype=None):
 def _put_str(s, space):
     return ('%s' % s)[:space].ljust(space)
 
-def _is_sequence(x):
-    try:
-        iter(x)
-        assert(not isinstance(x, basestring))
-        return True
-    except Exception:
-        return False
-
 def install_ipython_completers():  # pragma: no cover
     """Register the DataFrame type with IPython's tab completion machinery, so
     that it knows about accessing column names as attributes."""