indexes_list = [(3, 2), (2, 2), (1, 2)]
b = [['0', '0', '0'], ['0', '0', '0'], ['0', '0', '0'], ['0', '0', '0']]
for item in indexes_list:
b[item[0]][item[1]] = '1'
print b
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[['0', '0', '0'], ['0', '0', '1'], ['0', '0', '1'], ['0', '0', '1']]