value_in_series2.py

## Check if value exists in series -- correct way 
'skim, instant' in dairy_table.Food.values                ## call the column values
'skim, instant' in list(dairy_table['Food'])              ## convert to a list of values
dairy_table.Food.isin(['skim, instant']).any()            ## isin() checks against values
dairy_table['Food'].str.contains('skim, instant').any()   ## string method