[Python] How to recycle list to build a new column?

How can I create the type column recycling a two-elements list ["lat","lon"]?

adresse coord type
"place 1" 48.943837 lat
"place 1" 2.387917 lon
"place 2" 37.843837 lat
"place 2" 6.387917 lon

As it would be automatically done in R with d$type <- c("lat","lon")

Reprex :

d0 = pl.DataFrame(
{
"adresse": ["place 1", "place 2"],
"coord": [[48.943837, 2.387917], [37.843837, 6.387917]],
}
)
d1 = d0.explode("coord")


What I tried:

d1 = d1.with_columns(type=pl.Series(["1","2"]))
# ShapeError: unable to add a column of length 2 to a DataFrame of height 4

d1 = d1.join(pl.DataFrame({"id":["1", "2"]}), how="cross")
# logically, 8 rows instead of 4

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