Test of a Magic Square Matrix

#declare a blank list
a=[]
for i in range(3):
    b=[] #another blank list
    for j in range(3):
        j=int(input('enter number')) #for column
        b.append(j) #put j value in b for making a list
    a.append(b)
print("matrix is ------")

for i in range(3):
    for j in range(3):
        print(a[i][j],end=" ")
    print()
#initialization of sum for primary and secondary diagonal sum
sum1=0
sum2=0
for i in range(3):
    for j in range(3):
        #algorithm for primary and secondary diagonal sum
        if i==j:
            sum1=sum1+a[i][j]
if sum1!=sum2:
    boolean=0#denote boolean value as true or false
else:
    for i in range(3):
        sum_row=0
        sum_column=0
        for j in range(3):
            sum_row=sum_row+a[i][j]#summation of row
            sum_column=sum_column+a[j][i]#summation of column
            if sum_row!=sum1:
                boolean=0
            elif sum_column!=sum1:
                boolean=0
            else:
                boolean=1
if boolean==1:
      print("matrix is magic square")
else:
    print("matrix is not magic square")