import re
alist = [[1, 2, 3, [4]], [1, [5, [3, 1]]]]
res = list(map(float, re.findall("d+", str(alist))))
print(res)
import re
alist = [[1, 2, 3, [4]], [1, [5, [3, 1]]]]
res = list(map(float, re.findall("d+", str(alist))))
print(res)
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