事实上,你几乎从来不希望你的程序从第一行代码开始,简单地执行每一行,一直到最后。流程控制语句可以决定在什么条件下执行哪些Python指令。 这些流程控制语句直接对应于流程图中的符号,所以我将提供本章中讨论的代码的流程图版本。图 2-1 显示了下雨时该做什么的流程图。沿着箭头所指的路线从头到尾走。 图2-1:告诉...
猜测 There should be one-- and preferably only one --obvious way to do it. # 而是尽量找一种,最好是唯一一种明显的解决方案(如果不确定,就用穷举法) Although that way may not be obvious at first unless you're Dutch. # 虽然这并不容易,因为你不是 Python 之父(这里的Dutch是指Guido) Now is...
第一部分：编程环境准备 零基础入门Python的话我不建议用IDE，IDE叫集成开发环境，这东西一般是专业程序...
One line if statement: ifa > b:print("a is greater than b") Try it Yourself » Short Hand If ... Else If you have only one statement to execute, one for if, and one for else, you can put it all on the same line:
started as simple collection of various utilities for WSGI applications and has become one of the ...
Python语言比起C++、Java等主流语言,语法更简洁,也更接近英语,对编程世界的新人还是很友好的,这也是其显著优点。最近总有人问我Python相关的问题,这些问题也偏基础,自古有句话,授人以鱼不如授人以渔,刚好趁五一时间总结了几篇Python的知识点,帮助小伙伴成功入坑Python,将这门工具语言顺利掌握起来。 Python常用数据...
>>> o1 = OneOnly() >>> o2 = OneOnly() >>> o1 == o2 True >>> o1 <__main__.OneOnly object at 0xb71c008c> >>> o2 <__main__.OneOnly object at 0xb71c008c> 这两个对象是相等的,并且位于相同的地址;因此,它们是同一个对象。这个特定的实现并不是很透明,因为很难看出一个单例...
When day is equal to "Sunday", the condition is true and you get the first expression, "11AM", as a result. If the condition is false, then you get the second expression, "9AM". Note that similarly to the and and or operators, the conditional expression returns the value of one ...
There should be one -- and preferably only one -- obvious way to do it. 这一点和Perl有着很大的差异,Perl 往往有多种实现目的的方式(而且即兴写出来的代码很容易在几个月后看不懂)。 Python 和 Perl 用哪个好?我自己是写 Python 为主的,Perl 一直只有勉强读懂的水平,因此无法做深入的评价。单从生信...
The following example has a function with one argument (fname). When the function is called, we pass along a first name, which is used inside the function to print the full name: Example defmy_function(fname): print(fname +" Refsnes") ...