Python基础学习列表+元组+字典+集合
目录
一、列表二、元组三、字典四、集合五、总节前言：
这一章的知识紧接上一章，零基础的小伙伴可以从上一章学起来。当然，你也可以收藏起来慢慢学习，学习是不可操之过急的啦…
一、列表
print("-------------创建列表-------------");
list1 = ["JAVA", "Hello", "Python", "VS", 1, 2, 3]
print(list1)
list2 = list("Python")
print(list2)
list3 = []
print(list3)
print("-------------访问列表中的值-------------");
print("list1[0]: ", list1[0])
print("list2[1:5]: ", list2[1:5])
print("-------------列表函数-------------");
list1.append("XYZ") #向 list1 增加"XYZ"对象
print(list1.count("Python")) #返回"Python"出现次数
list1.extend(list2) #将 list2 加到 list1 后面
print(list1)
list1.remove("XYZ") #删除对象"XYZ"
print(list1.pop()) # 删除列表的最后位置上的对象并返回
print(list1)
D:\工作空间\Python\venv\Scripts\python.exe D:/工作空间/Python/main.py
-------------创建列表-------------
["JAVA", "Hello", "Python", "VS", 1, 2, 3]
["P", "y", "t", "h", "o", "n"]
[]
-------------访问列表中的值-------------
list1[0]: JAVA
list2[1:5]: ["y", "t", "h", "o"]
-------------列表函数-------------
1
["JAVA", "Hello", "Python", "VS", 1, 2, 3, "XYZ", "P", "y", "t", "h", "o", "n"]
n
["JAVA", "Hello", "Python", "VS", 1, 2, 3, "P", "y", "t", "h", "o"]
进程已结束,退出代码0二、元组
print("-------------创建访问元祖-------------");
#coding=utf-8
tuple = ( "Java", 786 , 2.23, "john", 70.2 )
tinytuple = (123, "john")
print(tuple) # 输出完整元组
print(tuple[0])# 输出元组的第一个元素
print(tuple[1:3]) # 输出第二个至第三个的元素
print(tuple[2:])# 输出从第三个开始至列表末尾的所有元素
print(tinytuple * 2) # 输出元组两次
print(tuple + tinytuple) # 打印组合的元组
D:\工作空间\Python\venv\Scripts\python.exe D:/工作空间/Python/main.py
-------------创建访问元祖-------------
("Java", 786, 2.23, "john", 70.2)
Java
(786, 2.23)
(2.23, "john", 70.2)
(123, "john", 123, "john")
("Java", 786, 2.23, "john", 70.2, 123, "john")
进程已结束,退出代码0三、字典
print("-------------创建字典-------------");
d1 = {} # 空字典
d2={"id":10,"tel":123456,"name":"小明"}
print(d1)
print(d2)
print("-------------访问字典-------------");
dict2 = {"name": "小明","id":1, "dept": "计算机"}
print(dict2["dept"])
print(dict2["name"])
print("-------------修改添加字典-------------");
dict1 = {"Name":"小明", "Age":19, "major":"计算机"};
dict1["Age"] = 18; # 字典中有"Age"键，更新现有元素
dict1["college"] = "Tech"; # 字典中无"college"键，执行添加操作
print("dict1["Age"]: ",dict1["Age"])
print("dict1["college"]: ",dict1["college"])
print("-------------删除字典-------------");
dict1={"stu_name":"小明","stu_id":1,"stu_age":24}
del dict1["stu_id"] # 删除键为"stu_id"的键值对
print(dict1)
dict1.clear() # 删除所有键值对
print(dict1)
D:\工作空间\Python\venv\Scripts\python.exe D:/工作空间/Python/main.py
-------------创建字典-------------
{}
{"id": 10, "tel": 123456, "name": "小明"}
-------------访问字典-------------
计算机
小明
-------------修改添加字典-------------
dict1["Age"]: 18
dict1["college"]: Tech
-------------删除字典-------------
{"stu_name": "小明", "stu_age": 24}
{}
进程已结束,退出代码0四、集合
print("-------------创建集合-------------");
s = set() # 空集
print(s)
print(type(s))
s = {1,2,3} # 直接写入集合元素
print(type(s))
s=set(["ABC","XYZ","xyz","123","1",1,1.0])
print(s)
s=set(i for i in range(10))
print(s)
s=frozenset("Python 3.3.3")
print(s)
s= dict((i,0) for i in {1, "ABC", "XYZ", "xyz", "1", "123"})
print(s)
s= dict((i,0) for i in frozenset({"n", "o", "h", " ", ".", "y", "t", "P", "3"}))
print(s)
print("-------------访问集合-------------");
s = set(["A", "B", "C", "D"])
# s = {"A", "B", "C", "D"}
print("A" in s)
print("a" not in s)
for i in s:
print(i,end="\t")
print("-------------更新集合-------------");
s = set(["A", "B", "C", "D"])
s = s|set("Python") # 使用操作符"|"
print(s)
s.add("ABC") # add()方法
print(s)
s.remove("ABC") # remove()方法
s.update("JAVAEF") # update()方法
print(s)D:\工作空间\Python\venv\Scripts\python.exe D:/工作空间/Python/main.py -------------创建集合------------- set(){1, "1", "xyz", "XYZ", "123", "ABC"} {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} frozenset({"t", "o", "y", "n", "3", ".", "h", " ", "P"}) {1: 0, "1": 0, "xyz": 0, "XYZ": 0, "123": 0, "ABC": 0} {"t": 0, "o": 0, "n": 0, ".": 0, "y": 0, "3": 0, "h": 0, " ": 0, "P": 0} -------------访问集合------------- True True B D C A -------------更新集合------------- {"B", "t", "o", "y", "n", "D", "C", "h", "P", "A"} {"B", "t", "o", "ABC", "y", "n", "D", "C", "h", "P", "A"} {"B", "E", "t", "o", "y", "n", "J", "D", "C", "h", "F", "P", "V", "A"} 进程已结束,退出代码0 D:\工作空间\Python\venv\Scripts\python.exe D:/工作空间/Python/main.py -------------创建字典------------- {} {"id": 10, "tel": 123456, "name": "小明"} -------------访问字典------------- 计算机 小明 -------------修改添加字典------------- dict1["Age"]: 18 dict1["college"]: Tech -------------删除字典------------- {"stu_name": "小明", "stu_age": 24} {} 进程已结束,退出代码0
五、总节
今天的基础知识就到这里了，一次性分享太多大家也记不住多少
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