Julia:如何获取DataFrame/Table中每一列的类型？

using DataFrames

# 创建一个DataFrame
df = DataFrame(A = [1, 2, 3], B = [1.0, 2.0, 3.0], C = ["a", "b", "c"])

# 获取每一列的类型
column_types = eltype.(eachcol(df))

# 打印每一列的类型
for (column_name, column_type) in zip(names(df), column_types)
    println("$column_name: $column_type")
end

A: Int64
B: Float64
C: String

using DataFrames, Tables

# 创建一个Table
tbl = table([1, 2, 3], [1.0, 2.0, 3.0], ["a", "b", "c"], names=["A", "B", "C"])

# 获取每一列的类型
column_types = Tables.columntypes(tbl)

# 打印每一列的类型
for (column_name, column_type) in zip(names(tbl), column_types)
    println("$column_name: $column_type")
end

A: Int64
B: Float64
C: String