先推荐一个学习python的好网址
简明 Python 教程
http://www.woodpecker.org.cn:9081/doc/abyteofpython_cn/chinese/index.html
学习编程快20年了,很少见到如此好的教程。简单,清晰。大部分的软件书籍翻译的是呕呀啁咂难为听,名声显赫的译者如候某人,也是50步笑百步而已。
网上有一种说法,一个有经验的程序员可以在半天内,学会python。
我试了一下,感觉该说法有点夸张。我大概用了1个晚上(3个小时)看到了《简明 Python 教程》第9章,感到这章有点难度了,头也有点晕了,语法基本上也看完了,就去休息。
准备第2天再慢慢看,用1-2个星期的下午时间,肯定是能学会的。
然后,我会把python和c++,delphi的使用感觉做一个对比。
一个好的集成开发环境,能很大地提高编程效率。所以,我得需要先找一个好的python 的开发工具。
python自己带的IDLE (Python GUI) 整体感觉还不错。
因为很久没有用过解释语言的开发环境了。用IDLE输入《简明 Python 教程》里边带的几个小例子,感觉比较新奇,好象又回到了上中学时在6502的计算机上,输入basic语言的体验。
调试怎么用呀?有点怪异,比较难上手,到现在也不会用,也不需要会了,因为现在我用eclipse +pyDev。
所以当大概学会python的语法后,我第1想到的是,先找一个更顺手的IDE。如果没有方便的IDE,宁可不学python。
上网先看到了boa constructor,免费的python ide,据说类似与delphi,居然这么好?赶快下来用,用后感觉比较失望。首先看到一个很难看的兰色的大蟒蛇,窗口的布局有些怪异,和delphi是不太一样的。单步调试的时候,屏幕有闪动,好象还有一些BUG,在我这里调试时,单步运行的感觉不太好。又换了winpdb, 感觉更不好。
然后,换 eclipse +pyDev, 感觉还不错。安装过程,请见下文分解。

TomergelistsinPython,youcanusethe operator,extendmethod,listcomprehension,oritertools.chain,eachwithspecificadvantages:1)The operatorissimplebutlessefficientforlargelists;2)extendismemory-efficientbutmodifiestheoriginallist;3)listcomprehensionoffersf

In Python 3, two lists can be connected through a variety of methods: 1) Use operator, which is suitable for small lists, but is inefficient for large lists; 2) Use extend method, which is suitable for large lists, with high memory efficiency, but will modify the original list; 3) Use * operator, which is suitable for merging multiple lists, without modifying the original list; 4) Use itertools.chain, which is suitable for large data sets, with high memory efficiency.

Using the join() method is the most efficient way to connect strings from lists in Python. 1) Use the join() method to be efficient and easy to read. 2) The cycle uses operators inefficiently for large lists. 3) The combination of list comprehension and join() is suitable for scenarios that require conversion. 4) The reduce() method is suitable for other types of reductions, but is inefficient for string concatenation. The complete sentence ends.

PythonexecutionistheprocessoftransformingPythoncodeintoexecutableinstructions.1)Theinterpreterreadsthecode,convertingitintobytecode,whichthePythonVirtualMachine(PVM)executes.2)TheGlobalInterpreterLock(GIL)managesthreadexecution,potentiallylimitingmul

Key features of Python include: 1. The syntax is concise and easy to understand, suitable for beginners; 2. Dynamic type system, improving development speed; 3. Rich standard library, supporting multiple tasks; 4. Strong community and ecosystem, providing extensive support; 5. Interpretation, suitable for scripting and rapid prototyping; 6. Multi-paradigm support, suitable for various programming styles.

Python is an interpreted language, but it also includes the compilation process. 1) Python code is first compiled into bytecode. 2) Bytecode is interpreted and executed by Python virtual machine. 3) This hybrid mechanism makes Python both flexible and efficient, but not as fast as a fully compiled language.

Useaforloopwheniteratingoverasequenceorforaspecificnumberoftimes;useawhileloopwhencontinuinguntilaconditionismet.Forloopsareidealforknownsequences,whilewhileloopssuitsituationswithundeterminediterations.

Pythonloopscanleadtoerrorslikeinfiniteloops,modifyinglistsduringiteration,off-by-oneerrors,zero-indexingissues,andnestedloopinefficiencies.Toavoidthese:1)Use'i


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