一，id，is，==
在Python中，id是什么？id是内存地址，比如你利用id()内置函数去查询一个数据的内存地址：
name = '太白' print(id(name)) # 1585831283968
那么 is 是什么？ == 又是什么？
== 是比较的两边的数值是否相等，而 is 是比较的两边的内存地址是否相等。 如果内存地址相等，那么这两边其实是指向同一个内存地址。
可以说如果内存地址相同，那么值肯定相同，但是如果值相同，内存地址不一定相同。
二，代码块。
根据官网提示我们可以获知：
根据提示我们从官方文档找到了这样的说法： A Python program is constructed from code blocks. A block is a piece of Python program text that is executed as a unit. The following are blocks: a module, a function body, and a class definition. Each command typed interactively is a block. A script file (a file given as standard input to the interpreter or specified as a command line argument to the interpreter) is a code block. A script command (a command specified on the interpreter command line with the ‘-c‘ option) is a code block. The string argument passed to the built-in functions eval() and exec() is a code block. A code block is executed in an execution frame. A frame contains some administrative information (used for debugging) and determines where and how execution continues after the code block’s execution has completed.