CODEWITHSUNDEEP
pythonlistdictionary
Chan Austin
Chan Austin

Reputation: 2388

get key and value from a list with dict

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.

Upvotes: 1

Views: 37598

Answers (3)

xgord
xgord

Reputation: 4806

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]

Upvotes: 10

Rajiv Sharma
Rajiv Sharma

Reputation: 7142

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]

Upvotes: 1

Abhinay Reddy Keesara
Abhinay Reddy Keesara

Reputation: 10141

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())

Upvotes: 5

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