ArcGIS Python编程 二

1.列表 list[] 存储，修改

修改一

name = ["GIS","xiaomao","农业","123","....."]
name[2]) # 农业
name[0:3] #切片：顾头不顾尾['GIS', 'xiaomao', '农业']
name[-1] #最后一值.....
name[-3:-1] #['农业', '123']
name[-3:] #['农业', '123', '.....']

修改二

name = ["GIS","xiaomao","农业","123",".....","123"]
name.append("fuck") #追加
name.insert(3,"zhou") #插入
name[0]="ming" #替换
name.remove("ming") #删除
del name[1]
name.pop() #默认空值，则删除最后一个
name.pop(1)
name.index("123") #获取索引
name[name.index("123")] #根据索引获取要素
name.count("123") #统计要素个数
name.reverse() #反转列表
#name.sore() #要素按ASCll表排序

name2 = ["F","U","C","K"]
name.extend(name2) #合并

 

实例low

book_list = [
("ArcGIS",70),
("ENVI", 65),
("javascriptGIS", 80),
("WebGIS", 90),
("pythonGIS", 120),
("IOSGIS", 150),
("PcGIS", 180),
("AndroidGIS", 190),
("javaGIS", 88),
]
shoppingCart = []
salary = input("你的零钱:")
if salary.isdigit():
salary = int(salary)
while True:
for index,item in enumerate(book_list): #获取索引及要素 print(book_list.index(item),item)
print(index,item)
userChoice = input('选择的商品：')
if userChoice.isdigit():
userChoice = int(userChoice)
if userChoice < len(book_list) and book_list >= 0:
p_item = book_list[userChoice]
if p_item[1] <= salary: #零钱够付
shoppingCart.append(p_item)
salary -= p_item[1]
print("你的%s已加入购物车,你的余额为------%s------"%(p_item,salary))
else:
print("余额不足，只剩---[%s]---"%salary)
else:
print("%s商品不存在"%userChoice)
elif userChoice == "q":
print(">>>>>>shoppingCart<<<<<<")
for p in shoppingCart:
print(p)
print("余额，只剩:", salary)
exit()
else:
print("错误选项！")
else:
print("请输入正确金额！")

 

2.元组 tuple() 只读列表，不能修改；只有两个方法：count,index

 

3.字典： dict{ key:value }

 

#name = "zhouMingGang"
#name2 = ["zhou","ming","gang"]
names={"name":"zmg",
"name1":"zhou",
"name2": "ming",
"name3": "gang",}

name4={"name":"zhouMingGang",
1:2,
4:9
}
#print("+".join(name))
#print("+".join(name2))
#print("-".join(name3))
names.update(name4)
names["name4"]="chong"
names["name2"]="yun"

del names["name2"]
names.pop("name4")
print(names.get("name1"))
print(names)
print(names.items())

a=dict.fromkeys([9,8,6],[1,{"name":"zmg"},99])
print(a)

 

 

 循环：

for i in names:
print(i,names[i])

4.集合： set() 去重，无序,关系测试>>>>交集，差集，并集

 

集合：   set()   去重，无序,关系测试>>>>交集，差集，并集


list = [1,4,5,6,7,7,8,2,5,6]
list1 = set(list)
print(list1)

list2 = set([1,4,7,8,9])
print(list1.intersection(list2))     #交集,共同要素被取出  {8, 1, 4, 7}
print(list1 & list2)

print(list1.union(list2))            #并集 list1 U list2 {1, 2, 4, 5, 6, 7, 8, 9}
print(list1 | list2)

print(list1.difference(list2))       #差集,list1独有  {2, 5, 6}
print(list1 - list2)
print(list2.difference(list1))
print(list2 - list1)

print(list1.symmetric_difference(list2))   #对称差集 {2, 5, 6, 9}
print(list1 ^ list2)

list1.issubset(list2)                #子集

list1.issuperset(list2)              #父集


list1.add("fuck")
list1.update(["F","u","C"])
list1.pop()