Keeping a value the same despite changing the variable it was equated to

[TheTypicalDoge]

I'm beginning to learn Python and I've come across a problem that is foreign to me as a past Lua programmer. I've noticed that after appending a variable to a list, if that variable changes value so does the value in the list as well, even though the list was never directly redefined.
Here's what I mean,

currentPath = ["EWR", "JFK", "SFO"]
completedPaths = []

completedPaths.append(currentPath)
print(completedPaths)

currentPath.clear()
print(completedPaths)

Output:
["EWR", "JFK", "SFO"]
[[]]

This confuses me because in Lua the list in completedPaths would stay the same until directly redefined, even if the variable it was once equated to has changed. How would I solidify the list inside of completedPaths while also changing the currentPath variable to input more values later on?