python package 的两种组织方式

        # 空文件

        class Class1:
            def __init__(self):
                self.name = "class one"
            
            def printInfo(self):
                print("i am class One!")

        class Class2:
            def __init__(self):
                self.name = "class two"
            
            def printInfo(self):
                print("i am class two!")

    from package1.class1 import Class1
    from package1.class2 import Class2

    if __name__ == "__main__":
        c1 = Class1()
        c1.printInfo()
        c2 = Class2()
        c2.printInfo()

        from .class1 import Class1
        from .class2 import Class2

        class Class1:
            def __init__(self):
                self.name = "class one"
            
            def printInfo(self):
                print("i am class One!")

        class Class2:
            def __init__(self):
                self.name = "class two"
            
            def printInfo(self):
                print("i am class two!")

    from package2 import Class1, Class2

    if __name__ == "__main__":
        c1 = Class1()
        c1.printInfo()
        c2 = Class2()
        c2.printInfo()