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列表生成式
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table th { font-weight: bold }
table th,table td { border: 1px solid #ccc; padding: 6px 13px }
table tr { border-top: 1px solid #ccc; background-color: #fff }
table tr:nth-child(2n) { background-color: #f8f8f8 }
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面向过程编程
流水线式的编程思想,在设计程序时,把整个流程设计出来
优点:体系结构更加清晰
简化程序的复杂度
缺点:可扩展性差 ,面向过程应用场景:不需要经常改变的软件
列表生成式
非常简单却很方便很强大的创建列表的生成式
[expr for iter_var in iterable if cond_expr]
[dadada for i in [] if : for i in ]
[生成的值 可加for循环 判断 多层循环 ]
优点:省内存,运行快
生成器表达式
可利用列表生成式的方法对生成一个元祖形式的表达式
(expr for iter_var in iterable if cond_expr)
[dadada for i in [] if : for i in ]
[生成的值 可加for循环 判断 可多层循环 ]
列表生成式
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