在Python中格式化多行字典的正确方法是什么?

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问题描述

在Python中，我想在代码中编写多行字典.有几种方法可以格式化它.以下是我想到的一些内容:

In Python, I want to write a multi-line dict in my code. There are a couple of ways one could format it. Here are a few that I could think of:

mydict = { "key1": 1,
           "key2": 2,
           "key3": 3, }

mydict = { "key1": 1,
           "key2": 2,
           "key3": 3,
         }

mydict = {
    "key1": 1,
    "key2": 2,
    "key3": 3,
}

我知道以上任何一项在语法上都是正确的，但是我假设Python字典有一种首选的缩进和换行样式.什么事?

I know that any of the above is syntactically correct, but I assume that there is one preferred indentation and line-break style for Python dicts. What is it?

注意:这不是语法问题.就我所知，以上所有都是有效的Python语句，并且彼此等效.

Note: This is not an issue of syntax. All of the above are (as far as I know) valid Python statements and are equivalent to each other.

推荐答案

我使用#3.与长列表，元组等相同.不需要在缩进之外添加任何额外的空格.一如既往，保持一致.

I use #3. Same for long lists, tuples, etc. It doesn't require adding any extra spaces beyond the indentations. As always, be consistent.

mydict = {
    "key1": 1,
    "key2": 2,
    "key3": 3,
}

mylist = [
    (1, 'hello'),
    (2, 'world'),
]

nested = {
    a: [
        (1, 'a'),
        (2, 'b'),
    ],
    b: [
        (3, 'c'),
        (4, 'd'),
    ],
}

类似地，这是我首选的包含大型字符串而不引入任何空格的方式(例如，如果使用三引号的多行字符串，您会得到):

Similarly, here's my preferred way of including large strings without introducing any whitespace (like you'd get if you used triple-quoted multi-line strings):

data = (
    "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABG"
    "l0RVh0U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAEN"
    "xBRpFYmctaKCfwrBSCrRLuL3iEW6+EEUG8XvIVjYWNgJdhFjIX"
    "rz6pKtPB5e5rmq7tmxk+hqO34e1or0yXTGrj9sXGs1Ib73efh1"
    "AAAABJRU5ErkJggg=="
)

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