This version gets the feature for handling xlsx files.
### T["sheet name"] is a DataFrame object of Pandas ###
$ opy -t xlsx '{a = T["Sheet1"].values};[a]' ./testdata/test.xlsx
[[123 datetime.datetime(2021, 1, 1, 0, 0) nan]
['危険シェル芸' 'ドラゴン曲線' nan]
['キュアエンジニア' '素数' nan]
['エ"ク"シ"ェ"ル"芸' '変,態,シ,ェ,ル,芸' nan]
[1 2 3.0]
[nan nan nan]]
$ opy -t xlsx '[T["Sheet1"][0][0]]' ./testdata/test.xlsx
123