Python 重复导入的问题 - V2EX
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911061873

Python 重复导入的问题

  •  
  •   911061873 Sep 17, 2021 2805 views
    This topic created in 1683 days ago, the information mentioned may be changed or developed.

    项目目录如下

    │ a.py └─api b.py __init__.py 

    a 中的内容

    from api.b import test aaa = 'a' test() 

    b 中的内容

    from a import aaa def test(): print(aaa) 

    现在执行 a 就提示导入重复。不知道怎么解决

    11 replies    2021-09-22 09:47:55 +08:00
    yunyuyuan
        1
    yunyuyuan  
       Sep 17, 2021
    a 改成
    ```python
    aaa = 'a'
    from api.b import test
    test()
    ```
    911061873
        2
    911061873  
    OP
       Sep 17, 2021
    @yunyuyuan 如果只是换了下位置 我试了下好像还是不行
    zhuangzhuang1988
        3
    zhuangzhuang1988  
       Sep 17, 2021
    看下 <effective python>
    第 88 条 用适当的方式打破循环依赖关系 // 350
    https://book.douban.com/subject/35334595/
    LicenseXu
        4
    LicenseXu  
       Sep 17, 2021
    b.py 里的 import 放到函数 test 里面
    def test():
    from a import aaa
    print(aaa)
    yunyuyuan
        5
    yunyuyuan  
       Sep 17, 2021
    @911061873 搞忘了,要加 main 的,这样就行了。

    aaa = 'aaa'

    if __name__ == '__main__':
    from api.b import test
    test()
    yunyuyuan
        6
    yunyuyuan  
       Sep 17, 2021
    v 站到底怎么发代码
    2owe
        7
    2owe  
       Sep 17, 2021
    增加 c,将 aaa 移到 c 中,让 c 可以被其它引用
    Nich0la5
        8
    Nich0la5  
       Sep 17, 2021
    这不是循环依赖吗 不要这么搞
    jaredyam
        9
    jaredyam  
       Sep 17, 2021
    竟然还能从 b 里导入 a,就很神奇
    jaredyam
        10
    jaredyam  
       Sep 17, 2021
    你这种写法还会出很多其它问题,里包导外包应该使用相对导入,from ..a import ...
    frostming
        11
    frostming  
       Sep 22, 2021
    def test():
    from a import aaa
    print(aaa)

    把 import 移到 test 里面去就解决问题了
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