Python 单行 for 循环来构建字典？
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Single line for-loop to build a dictionary?
提问by easythrees
I'm constructing a dictionary (which I'll later make into a JSON string). I construct it like this:
我正在构建一个字典（稍后我将把它变成一个 JSON 字符串）。我这样构造它：
data = {}
for smallItem in bigList:
data[smallItem] = smallItem
How can I make that for loop one line?
我怎样才能让它循环一行？
采纳答案by easythrees
You can use a dict comprehension:
您可以使用字典理解：
data = {smallItem:smallItem for smallItem in bigList}
You might also use dictand a generator expression:
data = dict((smallItem, smallItem) for smallItem in bigList)
But the dict comprehension will be faster.
但是字典理解会更快。
As for converting this into a JSON string, you can use json.dumps.
至于将其转换为 JSON 字符串，您可以使用json.dumps.
回答by jamylak
Actually in this specific case you don't even need a dictionary comprehension since you are using duplicate key/value pairs
实际上，在这种特定情况下，您甚至不需要字典理解，因为您使用的是重复的键/值对
>>> bigList = [1, 2, 3, 4, 5]
>>> dict(zip(bigList, bigList))
{1: 1, 2: 2, 3: 3, 4: 4, 5: 5}
