# Python program explaining
# numpy.ma.mask_cols() function
  
# importing numpy as geek  
# and numpy.ma module as ma 
import numpy as geek 
import numpy.ma as ma 
  
arr = geek.zeros((3, 3), dtype = int)
arr[1, 1] = 1
   
arr = ma.masked_equal(arr, 1)
  
gfg = ma.mask_cols(arr)
  
print (gfg)

[[0 -- 0]
 [0 -- 0]
 [0 -- 0]]

# Python program explaining
# numpy.ma.mask_cols() function
  
# importing numpy as geek  
# and numpy.ma module as ma 
import numpy as geek 
import numpy.ma as ma 
  
arr = geek.zeros((4, 4), dtype = int)
arr[2, 2] = 1
   
arr = ma.masked_equal(arr, 1)
  
gfg = ma.mask_cols(arr)
  
print (gfg)

[[0 0 -- 0]
 [0 0 -- 0]
 [0 0 -- 0]
 [0 0 -- 0]]