問題：
Specifically: I am trying to use Julia's DataFrames package, specifically the readtable() function with the names option, but that requires a vector of symbols.具體來說：我正在嘗試使用 Julia 的 DataFrames 包，特別是帶有名稱選項的 readtable() 函數，但這需要一個符號向量。
- what is a symbol?什麼是符號？
- why would they choose that over a vector of strings?爲什麼他們會選擇它而不是字符串向量？
So far I have found only a handful of references to the word symbol in the Julia language.到目前爲止，我在 Julia 語言中只發現了少數對單詞符號的引用。 It seems that symbols are represented by ":var", but it is far from clear to me what they are.似乎符號由“:var”表示，但我不清楚它們是什麼。
Aside: I can run旁白：我可以跑
df = readtable( "table.txt", names = [symbol("var1"), symbol("var2")] )
My two bulleted questions still stand.我的兩個項目符號問題仍然有效。
解決方案：
參考一： https://en.stackoom.com/question/1aWPK參考二： https://stackoom.com/question/1aWPK