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如何将两个字典与同样的钥匙合并,保持更大的价值?
原标题:How to merge two dictionaries with the same keys and keep the larger value?

我有两条字:

a = { a : 1,  b : 2,  c : 3}
b = { a : 2,  d : 4,  c : 5}

我也希望:

{ a : 2,  b : 2,  c : 5}

页: 1 页: 1

{ a : 2,  b : 2,  c : 5,  d : 4}

如何利用最简单和最快的方式将钥匙排除在<代码>b之外。

我正在使用3.7 p。

问题回答

首先,为了不增加任何新内容,你必须过滤第二个<编码>的<>条/代码>的内容。 我谈两种可能的解决办法:

a = { a : 1,  b : 2,  c : 3}
b = { a : 2,  d : 4,  c : 5}

for k,v in b.items():
    if (k in a.keys()):
        a[k] = v

print(a)
a = { a : 1,  b : 2,  c : 3}
b = { a : 2,  d : 4,  c : 5}

a.update([(k,v) for k, v in b.items() if k in a.keys()])

print(a)

Output for both:

{ a : 2,  b : 2,  c : 5}

我认为,理解足够容易:

{ i : (b[i] if i in b else a[i]) for i in a }

引证:

a = { a : 1,  b : 2,  c : 3}
b = { a : 2,  d : 4,  c : 5}

result = {}

# Iterate over keys in dictionary a
for key, value in a.items():
    # If key exists in dictionary b, choose the maximum value
    if key in b:
        result[key] = max(value, b[key])
    else:
        result[key] = value

print(result)

还应当努力:

result = {key: max(a.get(key, 0), b.get(key, 0)) for key in a}

print(result)




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