numpy . ma . maskearray . tolist()函数–Python
原文:https://www . geeksforgeeks . org/numpy-ma-masked array-to list-function-python/
numpy.ma.MaskedArray.tolist() 函数将屏蔽数组的数据部分作为分层 Python 列表返回。
语法:numpy . ma . maskedarray . to list(fill _ value = None)
参数: 轴:【标量，可选】用于无效条目的值。默认值为无。
返回:【列表】屏蔽数组的 Python 列表表示。
代码#1 :
# Python program explaining
# numpy.ma.MaskedArray.tolist() function
# importing numpy as geek
# and numpy.ma module as ma
import numpy as geek
import numpy.ma as ma
arr = geek.ma.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]],
mask =[0] + [1, 0] * 4)
gfg = arr.tolist()
print (gfg)
输出:
[[1, None, 3], [None, 5, None], [7, None, 9]]
代码#2 :
# Python program explaining
# numpy.ma.MaskedArray.tolist() function
# importing numpy as geek
# and numpy.ma module as ma
import numpy as geek
import numpy.ma as ma
arr = geek.ma.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]],
mask =[0] + [1, 0] * 4)
gfg = arr.tolist(-999)
print (gfg)
输出:
[[1, -999, 3], [-999, 5, -999], [7, -999, 9]]
