玩转Python语言之1:快速入门

奇忠诚

# -*- coding: gb2312 -*-
"""
Created on Fri Sep 25 23:13:57 2015
@author: Administrator
"""
"""1、第一个程序"""
"""1:输出
print "hello","world"
"""
"""2:输入
a = raw_input()
print "This input is",a
"""
"""2、认识数字"""
"""3:数值类型转换
print "整数相除得整数",1/2
print "小数除整数得小数",1./2
print "小数除整数得小数",float(1)/2
print "小数相除得小数",1.5/0.7
print "小数相除得整",int(1.5/0.7)
print "小数相除得整",1.5//0.7
print "2的3次方",2**3
print "取余运算",8%6
"""
"""3、认识字符串 """
"""print "转义：hello "world" """
"""print "转义：hello\"world"
print "拼接：hello"+" world"
print "乘号作用" + "123"*3
print "字符串长度",len("hello")
print "数字转字符串"+str(123)+"123"
print "字符串转数字",int("123") + 123  
"""

"""4、字符串的索引和切片
print "索引：abcdef的第一个字符","abcdef"[0]
print "索引：abcdef的最后一个字符","abcdef"[-1]
print "切片: abcdef截取部分","abcdef"[1:3]
print "切片: abcdef截取开头","abcdef"[:3]
print "切片: abcdef截取结尾","abcdef"[3:]
print "切片: abcdef截取全部","abcdef"[:]
print "切片: abcdef补充","abcdef"[::1]
print "切片: abcdef补充:跳2个字符","abcdef"[::2]
print "切片: abcdef补充:从后向前跳2个字符","abcdef"[::-2]
"""
"""5、聚沙成塔之list
a=[0,1,2,3,4,5,[6,7,8]];
print "list下标",a[0]
print "list下标",a[-1]
print "list下标",a[-1][1]
b=[1,2,3]
c=[4,5,6]
print "list拼接",b+c
print "list b*3",b*3
print "list长度 len()",len(b)
del a[0]
print "list 删除 del a[0]",a
a.insert(1,1.5)
print "list插入insert",a
b.append(7)
b.append(8)
print "list尾部插入",b
"""
"""6、不可变的list 元组
a=(1,2,3)
a[0] = 5
"""
"""7、可以自定义索引的list dict
contact = {"LiLei":"0123456","HanMeiMei":"234569"}
print contact
print "检索",contact["LiLei"]
contact["zhangsan"]="231411"
print "添加",contact
contact["LiLei"] = "6543210"
print "修改",contact
del contact["LiLei"]
print "删除",contact
"""