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import random
a=[]
for i in range(5):
a.append([])
for j in range(5):
a[i].append(random.randint(0,9))
a=[[random.randint(0,9) for i in range(5)] for j in range(5)]
for i in range(5):
for j in range(5):
print(str(a[i][j]).rjust(4),end='')
print()
print('==========================================')
for i in range(5):
for j in range(5):
a[1][j],a[4][j]=a[4][j],a[1][j]
print(str(a[i][j]).rjust(4),end='')
print()
这样第五行总是被覆盖而不是和第二行互换位置
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