Mergeable Python dictionary/OrderedDict/defaultdict/Counter with arithmetic operator support.
from BetterDicts import BetterDict, BetterOrderedDict, BetterDefaultDict, merged
# add, subtract, multiply, or divide values of like keys with '+-*/' operators
>>> hour1_views = BetterDict({"user1": 4, "user2": 5, "user3": 1})
>>> hour2_views = BetterDict({"user4": 9, "user2": 2, "user6": 6})
>>> hour1_views + hour2_views
{'user1': 4, 'user2': 7, 'user3': 1, 'user4': 9, 'user6': 6}Merge dictionaries with custom logic:
# in-place
>>> en = BetterDict({1: "one", 2: "two", 3: "three"})
>>> es = BetterDict({1: "uno", 2: "dos", 3: "tres"})
>>> en.merge(es, lambda a, b: [a,b])
>>> en
{1: ['one', 'uno'], 2: ['two', 'dos'], 3: ['three', 'tres']}
# or return a new, merged BetterDict:
>>> en = BetterDict({1: "one", 2: "two", 3: "three"})
>>> es = BetterDict({1: "uno", 2: "dos", 3: "tres"})
>>> merged(en, es, lambda a, b: [a, b])
{1: ['one', 'uno'], 2: ['two', 'dos'], 3: ['three', 'tres']}You can also perform arithmetic with BetterDicts and scalars:
>>> raw_counts = BetterDict({'the': 1432, 'she': 600, 'wookie': 25})
>>> total = 10000.
>>> relative_freqs = raw_counts / total
>>> relative_freqs
{'she': 0.06, 'the': 0.1432, 'wookie': 0.0025}
>>> relative_freqs * 100
{'she': 6.0, 'the': 14.32, 'wookie': 0.25}