[英]Nested Dictionary Comprehension from a List of Lists in Python 3
edgeList is a list of lists edgeList是列表的列表
I have this working but its slower than I want: 我有这个工作,但它比我想要的慢:
for rowIndex, rowVal in enumerate(edgeList):
for colIndex, colVal in enumerate(rowVal):
EdgeDict[rowIndex][colIndex] = colVal
Would it be faster using dict comprehension? 使用dict理解会更快吗? I tried, but got tangled up in the syntax 我试过了,但是语法纠结了
A comprehension like this should do it, but I doubt that it is significantly faster. 这样的理解应该可以做到,但是我怀疑它的速度要快得多。 Also, the accessing of values is the same as in the list you have: 此外,值的访问与您拥有的列表中的访问相同:
edge_dict = {row: dict(enumerate(row_val)) for row, row_val in enumerate(edgeList)}
There is very little point in doing this. 这样做几乎没有意义。 You already have a map from coordinate pair to value . 您已经有了从坐标对到值的映射 。 Your edgeList
is that map: 您的edgeList
是该地图:
edgeList[integer_value_for_row][integer_value_for_col]
maps to your values. 映射到您的价值观。
You can produce your dictionary with: 您可以使用以下方法制作字典:
{row_index: dict(enumerate(row)) for row_index, row in enumerate(edgeList)}
This maps the result of enumerate()
directly to a dictionary; 这将映射的结果enumerate()
直接向字典; there is no need to nest that loop. 无需嵌套该循环。
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