Update a value in DataFrames.jl

[lungben]

Just guessing - could it be the same issue as here?

[ANN] CSV.jl 0.7 Release

I would advise against using DataFrame!(CSV.File(file; kw...)) if you plan on doing any mutating of your data frame. It’s safer to use DataFrame(CSV.File(file; kw...)) Otherwise you’ll run into problems like this: “df.csv” file: x,y a,1 b,2 Code julia> using DataFrames, CSV julia> df = DataFrame!(CSV.File("df.csv")) 2×2 DataFrame │ Row │ x │ y │ │ │ String │ Int64 │ ├─────┼────────┼───────┤ │ 1 │ a │ 1 │ │ 2 │ b │ 2 │ julia> filter!(r -> r.x == "b", …

Maybe updating your packages helps.