How do I get the countries CPI values from Thomson Reuters Eikon api via python/spyder? or excel?

When you type in Economic Indicators in Eikon search bar, it will bring up the app where you can choose the country and CPI from the dropdown list. This will get you a RIC which can be used in the get timeseries call shown by @chavalit.jintamalit. See example showing Poland and Russia.

>>> ek.get_timeseries('PLGDPY=ECI', start_date='2003-01-01', end_date='2020-01-01', interval='yearly')
PLGDPY=ECI  VALUE
Date
2003-12-31    3.6
2004-12-31    5.1
2005-12-31    3.5
2006-12-31    6.2
2007-12-31    7.0
2008-12-31    4.2
2009-12-31    2.8
2010-12-31    3.6
2011-12-31    5.0
2012-12-31    1.6
2013-12-31    1.4
2014-12-31    3.3
2015-12-31    3.8
2016-12-31    3.1
2017-12-31    4.8
2018-12-31    5.1
>>> ek.get_timeseries('RUBUD=ECI', start_date='2003-01-01', end_date='2020-01-01', interval='yearly')
RUBUD=ECI      VALUE
Date
2003-12-31  2.616667
2004-12-31  5.025000
2005-12-31  9.866667
2006-12-31  9.533333
2007-12-31  7.400000
2008-12-31  8.066667
2009-12-31 -1.800000
2010-12-31 -2.066667
2011-12-31  2.241667
2012-12-31  0.300000
2013-12-31  0.066667
2014-12-31  2.091667
2015-12-31 -3.133333
2016-12-31 -2.233333
2017-12-31 -1.008333
2018-12-31  2.491667
2019-12-31  3.266667