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[Python 技术培训] 第一周幻灯片 "Python 基础篇"

2006-10-31 12:12:26|  分类: Python |  标签: |举报 |字号 订阅

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Python 基础篇  -Life Is Short  You Need Python

Python 简介

  • Python是一种开源的 、解析性的,面向对象的编程语言。
  • Python使用一种优雅的语法,可读性强
  • Python支持类和多层继承等的面向对象编程技术。
  • Python可运行在多种计算机平台和操作系统中,如各位unix,windows,MacOS,OS/2等等


使用python

  • 安装python, 请参阅:http://www.python.org
  • 运行python脚本:
  1. 交互式运行(在Windows平台下有GUI界面)
  2. 执行python脚本文件
  3. 在Linux/UNIX环境下运行程序 。
  4. 在python头部加一行:#! /usr/local/bin/python
  5. chmod +x myfile.py
  6. ./myfile.py (当然也可以直接以python myfile 方式执行)


快速开始

  • 简单语句

print “hello world”

  • 计算器

1+1

  • 格式化字符串

print "The total is %0.2f" %56.3598

  • 注释

# 单行注释

"""多行注释"""

  • 模块
import sys
sys.exit()


Python的数据类型


变量的定义。在python中,变量的类型是由赋给它的数值定义的。

q = 7       #q其为数值型变量
q = "Seven" #q为字符串型变量

基本数据类型:字符串,整数,浮点数,虚数,布尔型
集合类型:列表(List),元组(Tuple),字典(Dictionary或Hash)

Python的数据类型:列表(List)

List的定义。

aList = [23] 或者 bList = [1,2,3]

List的使用。可以像c语言中数据一样引用list中的元素。

print bList[1]

List常用操作:append, del, + ,*, len(list)

[0] * 5

Python的数据类型:列表(方法)
Table 3.3. 列表对象支持的方法(演示)

append(x) count(x) extend(L)
Index(x) insert(i,x) pop(x)
remove(x) reverse() sort()



Python的数据类型:元组(Tuple)

Tuple的定义。

aTuple = (1, 3, 5)
print aTuple

List的使用。

  1. 元组可以用方括号括起下标做索引
  2. 元组一旦创建就不能改变
  3.  列表大部分操作同样适用于元组


Python的数据类型:字典(Hash)

字典是一个用大括号括起来的键值对,字典元素分为两部份,键(key)和值。字典是python中唯一内置映射数据类型。通过指定的键从字典访问值。
字典的使用:

a = {‘a’:’aa’, ‘b’:’bb’}
a[‘c’]=‘cc’
a.has_key(‘a’)


Python的数据类型:字典(常用方法)

字典的常用方法(演示):

has_key(x) keys() values()
items() clear() copy()
update(x) get(x[,y])


Python 控制语句 if

Python支持三种不同的控制结构:if,for和while,不支持C语言中的switch语句。
(1)if 语句的用法:

if EXPRESSION1:
    STATEMENT1
elif EXPRESSION2:
    STATEMENT2
else:
    STATEMENT3



Python 控制语句 for

for语句的用法:

mylist = "for statement"
for word in mylist:
    print word
else:
    print "End list"




Python 控制语句 while

while语句的用法:

a = 0
while a > 5:
    a = a + 1
    print a
else:
    print "a's value is five"


Python 循环中的控制语句

循环中的控制语句


break: 终止当前循环

continue: 终止本次循环

pass: 什么事都不错


Python 函数

函数定义:

def function_name(arg1,arg2[,...]):
    statement
     [return value]

函数名:

  1. 函数名必须以下划线或字母开头,可以包含任意字母、数字或下划线的组合。不能使用任何的标点符号;
  2. 函数名是区分大小写的。
  3. 函数名不能是保留字。



Python 函数

作用域:Python使用名称空间的概念存储对象,这个名称空间就是对象作用的区域, 不同对象存在于不同的作用域。下面是不同对象的作用域规则:

  1. 每个模块都有自已的全局作用域。
  2. 函数定义的对象属局部作用域,只在函数内有效,不会影响全局作用域中的对象。
  3. 赋值对象属局部作用域,除非使用global关键字进行声明。


LGB规则


大多数名字引用在三个作用域中查找:先局部(Local),次之全局(Global),再次之内置(Build-in)。

Python 函数

函数的参数的分类:
默认参数:def function(ARG=VALUE)
元组参数:def function(*ARG)
字典参数:def function(**ARG)
一些规则:

  1. 默认值必须在非默认参数之后;
  2. 在单个函数定义中,只能使用一个tuple参数(*ARG)和一个字典参数(**ARG)。
  3. tuple参数必须在连接参数和默认参数之后。
  4. 字典参数必须在最后定义。


Python 模块

模块:模块可把一个复杂的程序按功能分开,分别存放到不同文件中,使程序更容易维护和管理。在Python中的模块是一个以.py结尾的Python代码文件。可通过import命令输入,如:

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