julia：相当于pythons选择多索引级别（尤其是列）

Question

像这样的东西？

using DataFrames, CSV

# Used your sample data
df = DataFrame(CSV.File("data.tsv"))

# Filter the columns by country name
france_cols = findall(x -> occursin("France", x), names(df))

# Subset the df
dg = select(df, france_cols)

# Optional : use "sampleX" as col names instead of the country name
rename!(dg, collect(dg[1, :]))
dg = dg[2:end, :]

display(dg)
println(size(dg))

Answer 1