深浅拷贝-浅拷贝

shallow 浅
1.深浅拷贝
（1）浅拷贝 = 只拷贝一层
    #author: wylkjj
    #date:2019/1/1
    # s=[1,'alex','eric']
    # s1=[1,'alex','eric']
    # s1[0]=2
    # print(s)
    # print(s1)

    # s=[1,'alex','eric']
    # s2=s.copy()
    # print(s2)
    # s2[0]=3
    # print(s)
    # print(s2)

    s=[[1,2],'alex','eric']
    s3=s.copy()
    print(s3)
    # s3[1]='Linux'
    # print(s3)
    # print(s)
    s3[0][1]=3
    print(s3)
    print(s)
    注：copy 只会copy第一层
    例：
    husband = ["laowei",123,[15000,9000]]
    wife = husband.copy()
    wife[0] = "laowei"
    wife[1] = 345
    husband[2][1] -= 3000
    print(wife)