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【程序51】
题目：学习使用按位与 & 。
1.程序分析：0&0=0; 0&1=0; 1&0=0; 1&1=1
2.程序源代码：
if __name__ == '__main__':
a = 077
b = a & 3
print 'a & b = %d' % b
b &= 7