Python基础复习_Unit one
一. 编译&&安装Python2.7
1.安装python第三方模块管理工具
easy_install --->> easy_install-2.7 pip
Ipython #Python友好的交互界面
pip2.7 install ipython #通过pip安装Ipython
Pycharm 支持IDE图形界面编程
二.我们可以学到什么
python-基础语法
python-面向对象
python-多线程,socket,log,zmq
python-web端-Flask(HTML,CSS,DIV,JS)#前端，后台接口
[saltstack(基于python)-基本使用，二次开发; zabbix(python-api)-支持二次开发] ------------------- 基于二次开发
Docker,(Hadoop,spark)大数据－－－拓展课程
三.第一天学习课程
变量;变量的操作;判断;循环
1.变量(Variable Types)
a = 1 #标量,'',"";代表的是字符串(字符串和变量的区别)
a = [1,2,3,4] a[0]; #0代表下标，数组的下标
a = {'a'=0;'b'=1,'c'=2}; #a['a'] = 'value1'
２.字符的切片
把一个字符串当作数组来操作;
IndexError:string index out of range #下标越界
str = 'Hello World!'
print str #[开始:结束]
print str[0]
print str[2:5]
print str[2:]
print str * 2
print str+"TEST"
print str[-1]
print str[-1:-3]
print str[-5:-1]
3.list操作 #使用中括号包起来
list = ['abcd',786,2.23,'aaa']
4.元组 #使用小括号包起来
5.字典 #使用大括号包起来
tinydict = {'name':'john',code:678,'dept':'sales'}
print dict['one']
print dict[2]
print tinydict
print tinydict.keys() #输出字典的key值
print tinydict.values() #输出字典的values的值
6.基本的操作(数字操作)
(1)算数运算操作(+,-,*,/)
(2)比较操作(>,<,==,!=)
(3)赋值操作(把右边的东西，扔给了左边;+=,-=,*=,/=)
a = a+1 等价于 a+=1
(4)比特运算(把两个变量编程二进制，然后进行"与或非"操作);二进制的比较速度更快
(5)逻辑操作(与或非)
not #取反
(6)成员操作(是否在范围见 in,not in)
(*7)标识操作(通过Id比较;对于变量的操作)
a=1
id(a)
b=1
id(b)
a is b
赋值练习
a = 21
b = 10
c = 0
c = a + b
print "Line 1 - Value of c is ",c
c = a - b
print "Line 2 - Value of c is ",c
c = a * b
print "Line 3 - Value of c is ",c
c = a / b
print "Line 4 - Value of c is ",c
c = a % b
print "Line 5 - Value of c is ",c
＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
if;else比较操作
a = 21
b = 10
c = 0
if( a==b ):
print "Line 1 - a is equal to b"
else:
print "Line 1 - a is not equal to b"
if( a!=b ):
print "Line 2 - a is not equal to b"
else:
print "Line 2 - a is equal to b"
if( a < b ):
print "Line 4 - a is less than b"
else:
print "Line 4 - a is not less than b"
if(a>b):
print "Line 5 - a is greater than b"
else:
print "Line 5 - a is not greater than b"
＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿－
7.循环(while;for)
#条件，循环到什么时候停止;你要设置一个便里那个，或者多个变量，使你的程序能够不断接近这个停止的条件;在循环的过程中你要做什么？
while 条件:
代码块
for i in 范围:
代码块
a,b = 0,1
while b < 100:
print b
a,b=b,a+b
a = [1,2,3,4,5,6,7,8,9,10]
for x in a[::2]: #步长计算
print x
i = 1
print "-" * 50
while i < 11:
n = 1
while n <= 10:
print "%4d" %(i*n), #%d占位","不换行
n += 1
print ""
i+=1
print "-" * 50
8.continue&&break
a = raw_input("str":)
print a
int() #类型转换,类型可以互相转换
break #跳出整个循环体
continue #直接回到程序的入口
HomeWork:
正三角，倒三角，等边三角，三角套三角
