除了循环之外还有其他方法可以从任何序列数据（Python）更新字典吗？

Question

I have a code to update a dictionary like this :

c = { }
for i in ID :
    d = {i : V[i]}
    c.update(d)

Both ID and V are sequence data with a complex and huge items, where ID is a list and V is a dictionary.

Is there any ways in python to do that logic without using loop processes like "for"?

The use of loop processes take a lot of iteration impacted on run time.

Answer 1

No, you can't avoid a loop but you can try these alternatives:

c = { }
for i in ID :
    c[i] = V[i]

or

c = dict([(i, V[i]) for i in ID])

or

c = {i: V[i] for i in ID}

Answer 2

the short way of your code is:

c.update({i:V[i] for i in ID})

also you could use map , but it will iterate over

c.update(dict(map(lambda i:(i,V[i]),ID)))

Its all O(n) and you could just move it into C part rather than Python by using above notations!