1、说明
(1)Python 中的包(Package)则是模块的文件夹,往往由 __init__.py 指明某个文件夹为包;
(2)Package可以为某个目录下所有的文件设置统一入口。
2、实例
someDir/ main.py subModules/ __init__.py subA.py subSubModules/ __init__.py subSubA.py # subA.py def subAFun(): print('Hello from subAFun') def subAFunTwo(): print('Hello from subAFunTwo') # subSubA.py def subSubAFun(): print('Hello from subSubAFun') def subSubAFunTwo(): print('Hello from subSubAFunTwo') # __init__.py from subDir # Adds 'subAFun()' and 'subAFunTwo()' to the 'subDir' namespace from .subA import * # The following two import statement do the same thing, they add 'subSubAFun()' and 'subSubAFunTwo()' to the 'subDir' namespace. The first one assumes '__init__.py' is empty in 'subSubDir', and the second one, assumes '__init__.py' in 'subSubDir' contains 'from .subSubA import *'. # Assumes '__init__.py' is empty in 'subSubDir' # Adds 'subSubAFun()' and 'subSubAFunTwo()' to the 'subDir' namespace from .subSubDir.subSubA import * # Assumes '__init__.py' in 'subSubDir' has 'from .subSubA import *' # Adds 'subSubAFun()' and 'subSubAFunTwo()' to the 'subDir' namespace from .subSubDir import * # __init__.py from subSubDir # Adds 'subSubAFun()' and 'subSubAFunTwo()' to the 'subSubDir' namespace from .subSubA import * # main.py import subDir subDir.subAFun() # Hello from subAFun subDir.subAFunTwo() # Hello from subAFunTwo subDir.subSubAFun() # Hello from subSubAFun subDir.subSubAFunTwo() # Hello from subSubAFunTwo
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