What is the proper way to format a multi-line dict in Python?

user_125921 0
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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:

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

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

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

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?

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.

indentation multiline code-formatting python
8 Answers
user_19191100

flake8 – a utility for enforcing style consistency in python code, which checks your code syntax and provide instructions to improve it – recommends this format (see https://www.flake8rules.com/rules/E133.html):

mydict = {
    "key1": 1,
    "key2": 2,
    "key3": 3,
    }
user_139683920 
dict(rank = int(lst[0]),
                grade = str(lst[1]),
                channel=str(lst[2])),
                videos = float(lst[3].replace(",", " ")),
                subscribers = float(lst[4].replace(",", "")),
                views = float(lst[5].replace(",", "")))
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