Union of dict objects in Python

2018-06-05 13:15:54

This question already has an answer here:

How to merge two dictionaries in a single expression? 48 answers

This question provides an idiom. You use one of the dicts as keyword arguments to the dict() constructor:

dict(y, **x)

Duplicates are resolved in favor of the value in x ; for example

dict({'a' : 'y[a]'}, **{'a', 'x[a]'}) == {'a' : 'x[a]'}

你也可以使用dict的update方法

a = {'a' : 0, 'b' : 1}
b = {'c' : 2}

a.update(b)
print a

Two dictionaries

def union2(dict1, dict2):
    return dict(list(dict1.items()) + list(dict2.items()))

n dictionaries

def union(*dicts):
    return dict(itertools.chain.from_iterable(dct.items() for dct in dicts))

链接地址: http://www.djcxy.com/p/17558.html