如何匹配作为复制结果的确切列表

Question

if I have a list which is the result of a replication, how do I match it exactly?

x = [1, 2] * 10000
match x:
  case list([1, 2] * 10000):
    print(1)

gives,

    case list([1, 2] * 10000):
                     ^
SyntaxError: invalid syntax

Answer 1

The switch cases in python right now doesn't allow simple operations on case conditions.

you can use another class where you define your cases as an alternative :

(for more info check the documentation here )

class Cases:
    A = [1, 2] * 10000
    B = [1, 2] * 100000


x = [1, 2] * 100000

match x:
    case Cases.A:
        print(1)
    case Cases.B:
        print(2)

output:

2