numpy.ma.MaskedArray.tolist()函数– Python

numpy.ma.MaskedArray.tolist()函数将掩码数组的数据部分作为分层Python列表返回。

Syntax : numpy.ma.MaskedArray.tolist(fill_value = None)

Parameters :
axis : [scalar, optional] The value to use for invalid entries. Default is None.

Return : [list] The Python list representation of the masked array.

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]]