python学习笔记2---关键元素2

接上面1，控制流语句1.1 if语句a = 3if a == 1:print("a is 1")elif a == 2:print("a is 2")else:print("a is not a or 2")运行结果a is not a or 2与if语句对应的可以有多个或0个elif，else分支也是可选的2，while语句3，for...in 语句

letter :
letter :
(letter,)
:
(letter,)

运行结果为：Q is a consonantA is a vowelZ is a consonantW is a consonantS is a consonantX is a consonantE is a vowelD is a consonantC is a consonan4，基本的异常处理

5，算数操作符a+=8相当于a=a+8但对于复杂的表达式却不是这样6，输入\输出input 重定向test.py<test.data7，函数的创建和调用def functionName（arguments）：suit参数是可选的，多个参数使用逗号隔开