[英]Creating New dictionary from two dictionaries with Key as First dict's Value, and Value as the second dict's Value
Example:例子:
A = {1: "IWillBeAKeySoon", 7: "IHope"}
B = {1: "ItSeemsIAmAValue",6: "LostVal"}
I would like to combine A and B to get a dict C that looks like this:我想将 A 和 B 结合起来得到一个 dict C ,它看起来像这样:
C = {"IWillBeAKeySoon": "ItSeemsIAmAValue"}
I have done it manually:我已经手动完成了:
C={A[key]:value for key,value in B.items() if key in A}
I think there should be some built-in functions or more efficient way to do it, but I can't find it.我认为应该有一些内置功能或更有效的方法来做到这一点,但我找不到。
You could make use of zip :您可以使用zip :
>>> A = {1: "IWillBeAKeySoon", 6: "MeToo"}
>>> B = {1: "ItSeemsIAmAValue",6: "Val"}
>>> C = dict(zip(A.values(), B.values()))
>>> print(c)
{'MeToo': 'Val', 'IWillBeAKeySoon': 'ItSeemsIAmAValue'}
Regarding performance, dict(zip(...)))
seems to be the fastest:关于性能,
dict(zip(...)))
似乎是最快的:
import timeit
A = {x: '%s%12d' % ('a', x) for x in range(100)}
B = {x: '%s%12d' % ('b', x) for x in range(100)}
def v1():
C={A[key]:value for key,value in B.items() if key in B}
def v2():
C = dict(zip(A.values(), B.values()))
def v3():
C = {x[0]: x[1] for x in zip(A.values(), B.values())}
print(timeit.timeit(v1))
print(timeit.timeit(v2))
print(timeit.timeit(v3))
18.561055098
9.385801745000002
17.763003313
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