Plot 散點圖上只有“非無”值

Question

我有 2 個列表：

list1 = [-1, -6, None, -8, None, None, -2] #axis y
list2 = [1,2,3,4,5,6,7] #axis x

我需要 plot 在散點圖上只有非無值（-1，-6 ...）但同時在 X 軸上顯示 list2 上的所有值。

我還需要保持 Y 軸的順序與所示順序相同（-1、-6...）。 有誰可以幫助我嗎？

Answer 1

要過濾掉list1中的所有None值，您可以使用這樣的代碼片段

does_not_contain_none = list(filter(lambda x: x is not None, list1))

注意：這將保留元素的原始順序

Answer 2

一步步

zipped = zip(list1, list2)  # make pairs: (-1, 1), (-6, 2), (None, 3), ...
filtered = filter(lambda x: x[0] is not None, zipped)  # filter all pairs where first element is None
ys, xs = zip(*filtered)  # reverse zip operation but on the filtered data

更緊湊

filtered = (pair for pair in zip(list1, list2) if pair[0] is not None)
ys, xs = zip(*filtered)