Re-order Columns In A Data Frame Depending On Conditions Of Values

Question

a = [[0,0,0,0],[0,-1,1,0],[1,-1,1,0],[1,-1,1,0]]

df = pd.DataFrame(a, columns=[\'A\',\'B\',\'C\',\'D\'])
df

Output:

    A    B    C    D
0   0    0    0    0
1   0