CODEWITHSUNDEEP
pythonpython-3.6
GraphicsLab
GraphicsLab

Reputation: 39

linking two lists python

How can I link these two lists so when one list changes(the order) the other list follows keeping with the same numbers

List2=[5,4,3,2,1]
List3=[2,4,6,8,10]

changing the order of list2 and expected output

List2=[1,2,3,4,5]
List3=[10,8,6,4,2]

but the list2 order will change every time but always needs to be changed back to 1-5

(Python 3.6)

Upvotes: 0

Views: 430

Answers (2)

Anton vBR
Anton vBR

Reputation: 18916

List2=[5,4,3,2,1]
List3=[2,4,6,8,10]

The "easier" way would be to make a dictionary of dict3 and use that after you remake list 2. Something like this:

# Pair the lists
List3 = dict(zip(List2,List3))

# Remake List2
List2 = sorted(List2)

# Remake List3 based on List2
List3 = [List3[key] for key in List2]

List3

Returns:

[10, 8, 6, 4, 2]

Upvotes: 0

cs95
cs95

Reputation: 402852

Define a small helper function to sort the two lists based on one of them.

def revert(a, b):
    a, b = map(list, zip(*sorted(zip(a, b), key=lambda x: x[0])))
    return a, b

Now, call this function as and when needed.

List2, List3 = revert(List2, List3)

Upvotes: 1

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