list comprehensions

Example

if __name__ == '__main__':
    x = int(raw_input())
    y = int(raw_input())
    z = int(raw_input())
    n = int(raw_input())
    
ar= []
p = 0
 
ar = [[i,j,k] for i in range(x+1) for j in range(y+1) for k in range(z+1) if (i+j+k) !=n ]
print(ar)

Example 2

s3 = [i for i in s2 if i != ' ']