Error:can't assign to operator

[Prasad, Mrunalini]

Hello:
 
   I am getting the above error while tryign to run the tower of hanoi
program. The error is at line 42 highligted in red below. PLease advise
 
#!/usr/bin/env python
 
class Hanoi:
    
    def __init__(self, N):
        self.N = N
 
try:
    raise ValueError(N)
except ValueError, e:
    print "bad! value: %d" % e.value
 
    def display():
 
        print "A"
        for i in range(N):
            print "%d\n", A[i]
            i += 1
 
        print "B"
        for i in range(N):
            print "%d\n", B[i]
            i += 1
 
        print "C"
        for i in range(N):
            print "%d\n", C[i]
            i += 1
 
        print("-" * 10)
        return
 
    def move(source, dest):
 
        i = 0;j = 0
        while ((source + i) == 0) and (i < N):
            i += 1
 
        while ((dest + j) == 0) and (j < N):
            j += 1
 
        dest + j - 1 = source + i
        source + i = 0
        display()
        return dest + j - 1
 
    def solve(n, source, dest, spare):
 
        if ( n == 1 ):
            move(source, dest)
            return
 
        solve(n-1, source, spare, dest)
        move(source, dest)
        solve(n-1, spare, dest, source)
        return
 
    def main():
        
        A = [], B = [], C = []
        i = 0
        for i in range(N):
            A.append(i)
            i += 1
 
        for i in range(N):
            B[i] = 0
            i += 1
 
        for i in range(N):
            C[i] = 0
            i += 1
 
        print "Solution to the tower of Hanoi problem,\
              with %d disks \n" % N
 
        print "Starting state: \n" 
        diplay()
        print "Subsequent states: \n\n"
 
        solve(N,A,B,C)
        return 0
 

Thank you
Minnie   
         
    
                

 
 


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