量有点小大 不过有压力下让我心情愉悦 ??
总结总结咯
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别的语言的数组 python不用定义 直接使用
color=['红','橙','黄','绿','青','蓝','紫']
print(color[1:3]) //打印【1,3)的数据 反向选择用-1 -2
color.append("白") //增
color.remove("紫")
color.pop(2) //删除
color.insert(1,"黑") //插入
print(color)
color.reverse() //全体反转
print(color)
str=["'#","1","L","x","q","2"]
str.sort() //按照ASCII码排序 先符号在字母在数字
print(str)
color.extend(str)
print(color,str)
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import copy //导入copy包
color1=['红','橙','黄','绿','青',["h","u"],'蓝','紫']
color3=copy.deepcopy(color1) //深拷贝 全体拷贝一份
color2=color1.copy() //浅拷贝 拷贝第一层 深层不拷贝
produce=[("2",3),("3",2),("4",3)]
for index,item in enumerate(produce): //数组自动排序 打印数组排序号与内容
print(index+1,item) //数组为[]
tuple=('jake','mary','do')
print(tuple.index("jake")) //元组为()小括号
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***********************此为自行编写的购物车程序**************************
count=int(input("your salary"))
item=[[1,"iphone",5800],[2,"Mac Pro",12000],[3,"Starbuck Latte",200] ,[4,"Alex Book",400],[5,"Bike",800]]
num=[0,0,0,0,0]
count1=count
while(count>200):
print("you can buy following items!")
if(count>item[0][2]):
print(item[0])
if (count > item[1][2]):
print(item[1])
if (count > item[2][2]):
print(item[2])
if (count > item[3][2]):
print(item[3])
if (count > item[4][2]):
print(item[4])
choice=int(input("please choose which one do you want to buy!"))
count-=item[choice-1][2]
num[choice-1]= num[choice-1]+1
print("check! add [",item[choice-1][1],"] to your bag!")
print("----your left salary",count)
if(count<200):
print("your money is not enough!")
break
n=input("continue?(press q to end)")
if(n=="q"or n=="Q"):
break
print("------your salary:",count1,"--------")
print("------following things in your bag!------")
for i in range(5):
if(num[i]>0):
print(num[i],"*",item[i][1])
print("------left money",count,"--------")
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***********************string 的一些用法*****************
name="my name is cf"
#capitalize()---大写首字符
print(name.capitalize())
#center(int,fill)---前为长度总数 后为填充字符 str置于中心
print(name.center(50,"="))
#count(内容)---统计str中的(内容)个数
print(name.count("m"))
#把字符串转化为二进制
print(name.encode())
#endswith(内容)---判断字符串以(内容)结尾 返回boolean型
print(name.endswith("cf"))
#find(内容)---查找(内容)在str上的位置///可用来切片str
print(name.find("name"))
print(name[name.find("is"):])
# str.isalnum()是否只含阿拉伯数字或字母
print('ab23'.isalnum())
# str.isalpha()是否是纯字母
print('saSDA'.isalpha())
#'拼接内容'.join([数组]) 在数组每个元素中加上拼接内容
print('-'.join(['a','b','c']))
#首尾去空格和回车
print('\n name s \n'.strip())
# str.split(分隔符)将字符串按后面分隔符分割
print('1+2+3+4+5'.split("+"))
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**********************字典示例****************
#字典是无序的!
#
info={
'201901':'小明',
'201902':'小梁',
'201904':'小黑',
'201905':'小紫',
}
#增
info["201907"]='xiao黑2'
#删
#del info['201902']
info.pop("201902")
#改
info['201901']='xiaoming'
#查 2种方法
info.get('201905')#找不到返回null 优先使用
info["201905"] #找不到报错!
print(info)
#查找key是否在字典中 返回值boolean
print("201904" in info)
#update升级字典 key相同覆盖后面 key找不到增加项目
b={
'201904':'WHAT',
'23':'1',
3:5
}
info.update(b)
print(info)
#打印字典
for i in info:
print(i,info[i])