文稿语言编程

1、PHP 简介Python编程冯勇 提纲简介语法框架&类库实践Why Python?自从 1954 FORTRAN语言发明至今已有2500多种计算机开发语言存在开发语言历史研究站版本图谱Adrian: “Our response was: With PHP people learn that because they want to get jobs. With Java they learn that because they take computer science courses. With Python you learn it because you love it. Because

2、 you want to experience the beauty. Im sure its the same way for Ruby. If Im hiring a Python programmer the chances are that the person is good.” David: “I totally agree.” Adrian create Ruby on Rails!Why Python?轻易实现快速学习的梦想 深入体会动态语言的妙处 立即体验快速开发的快感 获得快速实现想法的能力Top LanguagePython应用领域桌面GUI软件开发,网络应用开发2/3D

3、图形处理,游戏开发文档处理,Web应用开发科学计算,移动设备应用开发嵌入其它应用开发.可以说除了OS和驱动程序，Python 可以干一切Python Web应用目录简介语法框架&类库实践使用Python平台Linux/BSD/Macwindows命令行直接敲入python进入交互命令行执行.py文件Ex: python hello.pyEx: ./hello.pyhello.py#!/usr/bin/env pythonprint “Hello World”特色缩进以:作为开始，不必使用;作为结束#作为单行注释 作为多行注释动态类型函数式编程(lambda Map Reduce Filter

4、Eval)生成器yield装饰器AOPCallable (class,object,function,Lambda)高级数据结构(list tuple dict)丰富标准库变量表达式3 + 53 + (5 * 4)3 * 2Hello + World变量a = 4 3b = a * 4.5c = (a+b)/2.5a = “Hello World”动态类型，根据运行时决定基本类型Numbers a = 3# Integerb = 4.5# Float pointc = 51728888333L# Long Integerd = 4 + 3j# Complex numberStrings a =

5、 Hello# Single quotesb = “World”# Double quotesc = “Bob said hey there.”# A mix of bothd = A triple qouted stringcan span multiple lineslike thise = “”Also works for double quotes”语法-ListLista = 2, 3, 4 # A list of integerb = 2, 7, 3.5, “Hello” # A mixed listc = # An empty listd = 2, a, b # A list c

6、ontaining a liste = a + b # Join two listsList的操作x = a1 # Get 2nd element (0 is first)y = b1:3 # Return a sub-listz = d102 # Nested listsb0 = 42 # Change an elementTupleTuplesf = (2,3,4,5) # A tuple of integersg = (,) # An empty tupleh = (2, 3,4, (10,11,12) # A tuple containing mixed objectsTuples的操

7、作x = f1 # Element access. x = 3y = f1:3 # Slices. y = (3,4)z = h11 # Nesting. z = 4特色与list类似，最大的不同tuple是只读且不可变化，类xrange不可取代tuple中的任意一元素DictDictionariesa = # An empty dictionaryb = x: 3, y: 4 c = uid: 105, login: beazley, name : David Beazley Dictionaries的存取u = cuid # Get an elementcshell = /bin/sh #

8、 Set an elementif c.has_key(directory): # Check for presence of an memberd = cdirectoryelse:d = Noned = c.get(directory,None) # Same thing, more compactIF-ELSEif-elseif a b:z = belse:z = apass 不做任何事if a = a and b = c:print b is between a and cif not (b c):print b is still between a and cLoopwhilewhi

9、le a b:# Do somethinga = a + 1for (遍历序列的元素)for i in 3, 4, 10, 25:print i# Print characters one at a timefor c in Hello World:print c# Loop over a range of numbersfor i in range(0,100):print iFunctiondef# Return the remainder of a/bdef remainder(a,b):q = a/br = a - q*breturn r# Now use ita = remainde

10、r(42,5) # a = 2返回值def divide(a,b):q = a/br = a - q*breturn q,rx,y = divide(42,5) # x = 8, y = 2Classclassclass Account:def _init_(self, initial):self.balance = initialdef deposit(self, amt):self.balance = self.balance + amtdef withdraw(self,amt):self.balance = self.balance - amtdef getbalance(self):

11、return self.balance使用classa = Account(1000.00)a.deposit(550.23)a.deposit(100)a.withdraw(50)print a.getbalance()异常trytry:f = open(foo)except IOError:print Couldnt open foo. Sorry.raisedef factorial(n):if n 0:raise ValueError,Expected non-negative numberif (n factorial(-1)Traceback (innermost last):Fi

12、le , line 1, in ?File , line 3, in factorialValueError: Expected non-negative numberPackage/Module组织方式# numbers.pydef divide(a,b):q = a/br = a - q*breturn q,rdef gcd(x,y):g = ywhile x 0:g = xx = y % xy = greturn gimportimport numbersx,y = numbers.divide(42,5)n = numbers.gcd(7291823, 5683)目录简介语法类库&框架实践Standard libPython本身就包含了丰富标准库String processingOperating system interf