datatable.FExpr.__getitem__()

datatable.FExpr.

self

[

selector

]

source

Apply a slice to the string column represented by this FExpr.

Parameters

self

FExpr[str]

selector

slice

The slice will be applied to each value in the string column self.

return

FExpr[str]

Examples

DT = dt.Frame(season=["Winter", "Summer", "Autumn", "Spring"], i=[1, 2, 3, 4]) DT[:, {"start": f.season[:-f.i], "end": f.season[-f.i:]}]

	start	end
	str32	str32
0	Winte	r
1	Summ	er
2	Aut	umn
3	Sp	ring

4 rows × 2 columns

See Also

• dt.str.slice() – the equivalent function in dt.str module.