列表、字典等的 Python“最佳格式实践”
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Python "best formatting practice" for lists, dictionary, etc
提问by Wizzard
I have been looking over the Pythondocumentation for code formatting best practice for large lists and dictionaries, for example,
我一直在查看Python文档，了解大型列表和字典的代码格式最佳实践，例如，
something = {'foo' : 'bar', 'foo2' : 'bar2', 'foo3' : 'bar3'..... 200 chars wide, etc..}
or
或者
something = {'foo' : 'bar',
'foo2' : 'bar2',
'foo3' : 'bar3',
...
}
or
或者
something = {
'foo' : 'bar',
'foo2' : 'bar2',
'foo3' : 'bar3',
...
}
How do I handle deep nesting of lists/dictionaries?
如何处理列表/字典的深层嵌套？
采纳答案by aaronasterling
My preferred way is:
我的首选方式是：
something = {'foo': 'bar',
'foo2': 'bar2',
'foo3': 'bar3',
...
'fooN': 'barN'}
回答by pyfunc
I prefer the second or third one.
我更喜欢第二个或第三个。
Reason:
原因：
- Each element is on its own line
- Reaching to end of line to add a new element is a pain in a text editor
- Adding a new element is easy
- With the third option, sometimes you can check the number of elements by selecting those lines. Most editors will tell you the number of selected lines.
- 每个元素都在自己的行上
- 到达行尾以添加新元素在文本编辑器中很痛苦
- 添加新元素很容易
- 使用第三个选项，有时您可以通过选择这些行来检查元素的数量。大多数编辑器会告诉您所选行的数量。
回答by Klaus Byskov Pedersen
Well, the first one is a no-go, since your lines should only 79 characters wide. With regards to the other two options, I suppose it's a matter of taste, but I personally prefer the second option.
嗯，第一个是不行的，因为你的行应该只有 79 个字符宽。至于其他两个选项，我想这是一个品味问题，但我个人更喜欢第二个选项。
回答by eumiro
Define your dictionary in any way you want and then try this:
以任何你想要的方式定义你的字典，然后试试这个：
from pprint import pprint
pprint(yourDict)
# for a short dictionary it returns:
{'foo': 'bar', 'foo2': 'bar2', 'foo3': 'bar3'}
# for a longer/nested:
{'a00': {'b00': 0,
'b01': 1,
'b02': 2,
'b03': 3,
'b04': 4,
'b05': 5,
'b06': 6,
'b07': 7,
'b08': 8,
'b09': 9},
'a01': 1,
'a02': 2,
'a03': 3,
'a04': 4,
'a05': 5,
'a06': 6,
'a07': 7,
'a08': 8,
'a09': 9,
'a10': 10}
Do you like the output?
你喜欢输出吗？
回答by ianaré
Definitely NOT option 1, one of the strenghts of Pythonis its legibility. Option 1 severely diminishes that legibility.
绝对不是选项 1，Python 的优势之一是它的易读性。选项 1 严重降低了可读性。
Out of 2 and 3, I'll echo the same reasons pyfunc stated for both.
在 2 和 3 中，我将回应 pyfunc 为两者陈述的相同原因。
However, in my own code I prefer option 3 simply because the first element sometimes gets 'lost' by being at the end of the declare line, and upon quick glancing at code sometimes I just won't see it immediately. I know it's a little silly, but the mind works in mysterious ways ...
然而，在我自己的代码中，我更喜欢选项 3，因为第一个元素有时会因为位于声明行的末尾而“丢失”，并且在快速浏览代码时有时我不会立即看到它。我知道这有点傻，但大脑以神秘的方式运作......
回答by Jungle Hunter
If you go by ganeti(which respects PEP 8) you should choose the third option.
如果您选择ganeti（尊重 PEP 8），您应该选择第三个选项。
something = {
'foo1': 'bar1',
'foo2': 'bar2',
'foo3': 'bar3',
...
}
I like this esp. because you can select onlythe elements you want. And I feel removing or adding elements to either ends is faster this way.
我喜欢这个 esp。因为你可以选择只想要的元素。而且我觉得通过这种方式在两端移除或添加元素会更快。
Note:As pointed out in the comment there should be no whitespace before ':' (E203) as per PEP.
注意：正如评论中所指出的，根据 PEP，':' (E203) 之前不应该有空格。
回答by danlei
aaronasterling's indentation style is what I prefer. This, and several other styles are explained in another SO Question. Especially Lennart Regebro's answer gave a nice overview.
aaronasterling 的压痕风格是我比较喜欢的。这和其他几种样式在另一个 SO Question 中进行了解释。尤其是 Lennart Regebro 的回答给出了一个很好的概述。
But this style was the one most voted for:
但这种风格是投票最多的风格：
my_dictionary = {
1: 'something',
2: 'some other thing',
}
回答by kasx93
I love the second way:
我喜欢第二种方式：
something = {'foo' : 'bar',
'foo2' : 'bar2',
'foo3' : 'bar3',
...
'fooN': 'barN'}
回答by jaydel
Previous to reading this post I would have opted for the third option you give. But now I might go for the one that is NOT T?r?k Gábor's style:
在阅读这篇文章之前，我会选择您提供的第三个选项。但现在我可能会选择不是 T?r?k Gábor 风格的：
my_dictionary = { 1: 'something', 2: 'some other thing', }
my_dictionary = { 1: '东西', 2: '其他东西', }
But honestly anything aside from your first option is probably fine.
但老实说，除了您的第一个选择之外，任何事情都可能没问题。
回答by frodopwns
According to the PEP8 style guidethere are two ways to format a dictionary:
根据PEP8 风格指南，有两种方法可以格式化字典：
mydict = {
'key': 'value',
'key': 'value',
...
}
OR
或者
mydict = {
'key': 'value',
'key': 'value',
...
}
If you want to conform to PEP8 I would say anything else is technically wrong.
如果您想符合 PEP8，我会说其他任何事情在技术上都是错误的。
