python - Sorting by instructions -


i have vector/column length 1000 , values 1,2.

how can sort vector/column obtain result like: 

1 2 1 2 1 2 etc.

in r:

some sample-data:

x <- sample(1:2, 1000, replace = true)

do:

x[match(rep(1:2, 500), x)]

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