COMPAT: don't force clipboard routines to be imported in main pandas started (pandas-dev#16294)

closes pandas-dev#16288
(cherry picked from commit 1e59b4c)

Author: jreback

doc/source/whatsnew/v0.20.2.txt

@@ -50,7 +50,7 @@ Indexing
 I/O
 ^^^
 
-
+- Bug that would force importing of the clipboard routines unecessarily, potentially causing an import error on startup (:issue:`16288`)
 
 
 Plotting

pandas/core/generic.py

@@ -1387,8 +1387,8 @@ def to_clipboard(self, excel=None, sep=None, **kwargs):
           - Windows: none
           - OS X: none
         """
-        from pandas.io.clipboard import clipboard
-        clipboard.to_clipboard(self, excel=excel, sep=sep, **kwargs)
+        from pandas.io import clipboards
+        clipboards.to_clipboard(self, excel=excel, sep=sep, **kwargs)
 
     def to_xarray(self):
         """

pandas/io/api.py

@@ -5,7 +5,7 @@
 # flake8: noqa
 
 from pandas.io.parsers import read_csv, read_table, read_fwf
-from pandas.io.clipboard.clipboard import read_clipboard
+from pandas.io.clipboards import read_clipboard
 from pandas.io.excel import ExcelFile, ExcelWriter, read_excel
 from pandas.io.pytables import HDFStore, get_store, read_hdf
 from pandas.io.json import read_json