You can do this because function objects can be assigned to variables, just like any other value.
能够这样做是因为，与其他值一样，function对象可以赋值给变量。
Because passing function objects in Python is so easy, this class USES far fewer lines than any similar class in another language would require.
因为使用Python传递函数对象是如此简单，与其它语言中的相似类比较，这个类所需使用行数非常少。
The header file defines function objects and function adapters.
头文件定义了函数对象和函数适配器。
However, this presents problems when the library allows arbitrary function objects to implicitly become slots, because slots are no longer comparable.
然而，当库允许任意的函数对象隐式地变成插槽时，这里出现了问题，因为插槽不再具有比较性。
This program contains two function definitions: print_lyrics and repeat_lyrics. Function definitions get executed just like other statements, but the effect is to create function objects.
这个程序包含两个函数的定义：print_lyrics以及repeat_lyrics，函数定义的执行就和其他语句一样，但是效果是创建函数对象。
This program contains two function definitions: print_lyrics and repeat_lyrics. Function definitions get executed just like other statements, but the effect is to create function objects.
这个程序包含两个函数的定义：print_lyrics以及repeat_lyrics，函数定义的执行就和其他语句一样，但是效果是创建函数对象。
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