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'''
【程序26】
题目：利用递归方法求5!。
1.程序分析：递归公式：fn=fn_1*4!
2.程序源代码：
def fact(j):
sum = 0
if j == 0:
sum = 1
else:
sum = j * fact(j - 1)
return sum
for i in range(5):
print '%d! = %d' % (i,fact(i))