''' 在程序运行的过程中,如果发生了错误,可以事先约定返回一个错误代码,这样,就可以知道是否有错,以及出错的原因.在操作系统提供的调用中,返回错误码非常常见.比如打开文件的函数open(),成功时返回文件描述符(就是一个整数),出错时返回-1. 用错误码来表示是否出错十分不便,因为函数本身应该返回的正常结果和错误码混在一起,造成调用者必须用大量的代码来判断是否出错 ''' # Exception # 高级语言通常都内置了一套try...except...finally...的错误处理机制,Py…

Python Learning Paths Python Expert Python in Action Syntax Python objects Scalar types Operators String I/O Functions Python modules Collections Python best practices Compare Python implementations Differentiate between computations using operators…

这是自己之前整理的学习Python的资料,分享出来,希望能给别人一点帮助. Learning Plan Python是什么?- 对Python有基本的认识 版本区别 下载 安装 IDE 文件构造 Python语言 - 基础的语言知识 变量 数据类型 列表/元组/字典/集合 条件语句 循环语句 函数 模块 面向对象 异常处理 Python命令行运行时带参数 Reference Python是什么?- 对Python有基本的认识 Python为我们提供了非常完善的基础代码库,覆盖了网络.文件.GUI…

如何开始Python语言学习? 1. 先了解它,Wiki百科:http://zh.wikipedia.org/zh-cn/Python 2. Python, Ruby等语言来自开源社区,社区的学法是Vim(编辑器) + Docs(技术文档) + Interactive Shell,再就是Code(源码) + O'Reily(书籍)    社区: http://www.reddit.com/r/python | 啄木鸟中文社区 | ChinaPythonUserGroup邮件列表 (活跃) | R…

1.The founder of python is Guido van Rossum ,he created it on Christmas in 1989, smriti of ABC language. 2.python can be used in many areas , such as   data analysis / Internet Service/ Image Processing and so on. 3.python is an interpretive language…

An inch is worth a pound of gold, an inch of gold is hard to buy an inch of time. Slice When the scale of data is so large that we have to pick a short of the content, the best way is to use Slice. Forward Slice >>>L=range(1,101) >>>L[1:…

OK, let's continue. Conditional Judgments and Loop if if-else if-elif-else while for break continue multiple loop Differences between Dict and Set Dict: A kind of structure in the type of "Key-Value" described in "{}" formed by "k…

After a short period of  new year days, I found life a little boring. So just do something funny--Python. Before we begin, what we should know first is that Python is a dynamic language, which means the type of data of every varieable Differences Bet…

1. Set  Set is a collection which is unordered and unindexed. No duplicate members In Python sets are written with curly brackets { } set1 = {'apple', 'banana', 'cherry'} list1 = [1, 2, 3, 4, 5] list_set = set(list1) print(set1) print(list_set, type(…

1.  Built-in Modules and Functions 1) Function def greeting(name): print("Hello,", name) greeting("Alan") 2)  import os import os os.system("dir") 2.  Number types 1)  int int, or integer, is a whole number, positive or negat…