相当于R中的python dict [英] equivalent of a python dict in R

问题描述

我想使R中的python字典等效。基本上，在python中，我有：

I want to make the equivalent of a python dict in R. Basically, in python I have:

visited = {}

if atom_count not in visited:
  Do stuff
  visited[atom_count] = 1

这个想法是，如果我看到特定的atom_count，则我访问过[atom_count] =1。因此，如果再次看到那个atom_count，我就不会做东西。 Atom_Count是一个整数。

The idea is, if I saw that specific, atom_count, I have visited[atom_count] = 1. Thus, if I see that atom_count again, i don't "Do Stuff". Atom_Count is an integer.

谢谢！

推荐答案

与python字典最接近的东西R只是一个列表。与大多数R数据类型一样，列表可以具有一个名称属性，该属性可以使列表像一组名称/值对一样起作用：

The closest thing to a python dict in R is simply a list. Like most R data types, lists can have a names attribute that can allow lists to act like a set of name-value pairs:

> l <- list(a = 1,b = "foo",c = 1:5)
> l
$a
[1] 1

$b
[1] "foo"

$c
[1] 1 2 3 4 5

> l[['c']]
[1] 1 2 3 4 5
> l[['b']]
[1] "foo"

现在通常的免责声明：它们不是完全相同。会有差异。因此，您将很失望，尝试使用与在python中使用字典完全相同的方式来实际使用列表。

Now for the usual disclaimer: they are not exactly the same; there will be differences. So you will be inviting disappointment to try to literally use lists exactly the way you might use a dict in python.

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