#用for语句生成一个100项的平方数数列的list，即[1,4,9,16,...,10000]
a=[]
for n in range(1,101):
i=n**2
a.append(i)
print(a)
#用for语句计算100项的平方数数列的和，即1+4+9+16+...+10000的结果
b=sum(a)
print('b=%s' %b)
a = [4,2,1,9,6,5,3,8,7]
for i in range(len(a)):
for j in range(i+1,len(a)):
if a[j] > a[i]:
t=a[j]
a[j] = a[i]
a[i]=t
print(a)
#运行结果
[9, 8, 7, 6, 5, 4, 3, 2, 1]
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