nums=[1,2];
print(id(nums));
nums=[2,3];
print(id(nums))
1766164947592
1766164947656
nums[:]=[2,3];这样nums的地址还是原来的,只是数据变了
nums=[1,2];
print(id(nums));
nums[:]=[2,3];
print(id(nums))
2260038410888
2260038410888
nums=[1,2];
print(id(nums));
nums=[2,3];
print(id(nums))
1766164947592
1766164947656
nums=[1,2];
print(id(nums));
nums[:]=[2,3];
print(id(nums))
2260038410888
2260038410888