Removes all information about each specified package from this interpreter, including information provided by both package ifneeded and package provide.
一个目录的Pythoncode被称为package,这样的导入被成为packageimport。
A directory of Python code is said to be a package, so such imports are known as package imports.
如果以前的packageprovide命令已经提供的package的一个不同的版本则生成一个错误。
An error occurs if a different version of package has been provided by a previous package provide command.
Package关键字声明了代码所属的包,在本例中这个包的名字就是main。
The package keyword declares the package this code belongs to, in this case a package named main.
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