结合kiamlaluno和Mark的答案，以及formatOnSave到Python的自动意图代码:

{
    "editor.formatOnSave": true,
    "editor.autoIndent": "advanced",
    "editor.detectIndentation": true,
    "files.insertFinalNewline": true,
    "files.trimTrailingWhitespace": true,
    "editor.formatOnPaste": true,
    "editor.multiCursorModifier": "ctrlCmd",
    "editor.snippetSuggestions": "top",
    "editor.rulers": [
        {
            "column": 79,
            "color": "#424142"
        },
        100, // <- a ruler in the default color or as customized at column 0
        {
            "column": 120,
            "color": "#ff0000"
        },
    ],

}

Visual Studio代码:版本1.14.2 (1.14.2)

按Shift + Command + P打开调色板 非macos用户按“Ctrl+P” 进入“设置。来打开设置文件。 在默认设置下，你可以看到: //显示垂直标尺的列 “editor.rulers”:[], 这意味着空数组不会显示垂直标尺。 在右侧的“用户设置”窗口，添加以下内容: “editor.rulers”:[140]

保存文件，您将看到标尺。

结合kiamlaluno和Mark的答案，以及formatOnSave到Python的自动意图代码:

{
    "editor.formatOnSave": true,
    "editor.autoIndent": "advanced",
    "editor.detectIndentation": true,
    "files.insertFinalNewline": true,
    "files.trimTrailingWhitespace": true,
    "editor.formatOnPaste": true,
    "editor.multiCursorModifier": "ctrlCmd",
    "editor.snippetSuggestions": "top",
    "editor.rulers": [
        {
            "column": 79,
            "color": "#424142"
        },
        100, // <- a ruler in the default color or as customized at column 0
        {
            "column": 120,
            "color": "#ff0000"
        },
    ],

}

进入菜单文件->首选项->设置并添加

"editor.rulers": [preferred-value, preferred-value]

颜色可定制

workbench.colorCustomizations

要在上面的基础上展开，您可以为每个标尺设置多个标尺和颜色。默认的颜色是“#5a5a5a”，如果你在最后添加两个数字，你可以调整它的透明度，使一些标尺比其他的更暗。

下面是我的标尺，以一种更容易编辑的简洁方式定义。

"editor.rulers": [
    {"column":   0, "color": "#5a5a5a80"}, // left boundary is 50% opaque
    {"column":   2, "color": "#5a5a5a20"}, // tab stops are 12.5% opaque
    {"column":   4, "color": "#5a5a5a20"},
    {"column":   6, "color": "#5a5a5a20"},
    {"column":   8, "color": "#5a5a5a20"},
    {"column":  10, "color": "#5a5a5a20"},
    {"column":  40, "color": "#5a5a5a20"}, // center line
    {"column":  79, "color": "#5a5a5a20"}, // right rule minus one
    {"column":  80, "color": "#5a5a5a80"}, // right rule
    {"column": 120, "color": "#5a5a5a40"}  // extra right rule
],   

除了全局的“editor.ruler”设置外，还可以在每种语言级别上设置。

例如，Python项目的样式指南通常指定79或120个字符，而Git提交消息应该不超过50个字符。

在你的设置中。Json，你会写:

"[git-commit]": {"editor.rulers": [50]},
"[python]": {
    "editor.rulers": [
        79,
        120
    ]
}