I have a list of dict:
dividends=[ {"2005":0.18}, {"2006":0.21}, {"2007":0.26}, {"2008":0.31}, {"2009":0.34}, {"2010":0.38}, {"2011":0.38}, {"2012":0.38}, {"2013":0.38}, {"2014":0.415}, {"2015":0.427} ] I want to retrieve the key and value to two lists, like:
yearslist = [2005,2006, 2007,2008,2009,2010...] dividendlist = [0.18,0.21, 0.26....]
any way to implement this?
thanks.
Assuming your dictionaries always have a single key,value pair that you are extracting, you could use two list comprehensions:
l1 = [d.values()[0] for d in dividends] # ['2005', '2006', '2007', '2008', '2009', '2010', '2011', '2012', '2013', '2014', '2015'] l2 = [d.keys()[0] for d in dividends] # [0.18, 0.21, 0.26, 0.31, 0.34, 0.38, 0.38, 0.38, 0.38, 0.415, 0.427] Try:
yearslist = dictionary.keys() dividendlist = dictionary.values() For both keys and values:
items = dictionary.items() Which can be used to split them as well:
yearslist, dividendlist = zip(*dictionary.items()) 
you can create two list and append keys in yearlist and values in dividendlist.
here is the code.
dividends=[ {"2005":0.18}, {"2006":0.21}, {"2007":0.26}, {"2008":0.31}, {"2009":0.34}, {"2010":0.38}, {"2011":0.38}, {"2012":0.38}, {"2013":0.38}, {"2014":0.415}, {"2015":0.427} ] yearlist = [] dividendlist = [] for dividend_dict in dividends: for key, value in dividend_dict.iteritems(): yearlist.append(key) dividendlist.append(value) print 'yearlist = ', yearlist print 'dividendlist = ', dividendlist Output:
yearlist = ['2005', '2006', '2007', '2008', '2009', '2010', '2011', '2012', '2013', '2014', '2015'] dividendlist = [0.18, 0.21, 0.26, 0.31, 0.34, 0.38, 0.38, 0.38, 0.38, 0.415, 0.427] second way you can use list comprehensions
dividends=[ {"2005":0.18}, {"2006":0.21}, {"2007":0.26}, {"2008":0.31}, {"2009":0.34}, {"2010":0.38}, {"2011":0.38}, {"2012":0.38}, {"2013":0.38}, {"2014":0.415}, {"2015":0.427} ] yearlist = [dividend_dict.keys()[0] for dividend_dict in dividends] dividendlist = [dividend_dict.values()[0] for dividend_dict in dividends] print 'yearlist = ', yearlist print 'dividendlist = ', dividendlist Output:
yearlist = ['2005', '2006', '2007', '2008', '2009', '2010', '2011', '2012', '2013', '2014', '2015'] dividendlist = [0.18, 0.21, 0.26, 0.31, 0.34, 0.38, 0.38, 0.38, 0.38, 0.415, 0.427] 
