Python中的列表list、元组（笔记）

基本：

names=["xx","zz","yy"]
print(names)

类型不受限：

ages=["xx",None,234]
print(ages)

嵌套列表：

classNames=["1",[1,2,3],"2"]
print(classNames)

classNames=["1",[1,2,3],"2"]
print(classNames[0])
print(classNames[1])
print(classNames[2])

classNames=["1",[1,2,3],"2"]
print(classNames[-1])
print(classNames[-2])
print(classNames[-3])

classNames=["1",[1,2,3],"2"]
print(classNames[-1])
print(classNames[-2][0])
print(classNames[-3])

列表的常用操作方法：

1.

#找不到就报错
classNames=["1",[1,2,3],"2"]print(classNames.index("1"))

2.

classNames=["1",[1,2,3],"2"]
classNames[0]="zhangsan"
print(classNames[0])

3.

4.

classNames=["1",[1,2,3],"2"]
classNames[0]="zhangsan"
classNames.insert(2,"lisi")
print(classNames)

5.

classNames=["1",[1,2,3],"2"]
classNames.append("dbsjd")
print(classNames)

6.

classNames=["1",[1,2,3],"2"]
classNames.extend([4,None,True])
print(classNames)

7.调用pop方法能够返回当前删除的元素

classNames=["1",[1,2,3],"2"]
del classNames[1] 
classNames.pop(1)
print(classNames)
#注意del 跟def关键字不要混淆起来

8.这个估计比较少用，只能删掉一个，除非删掉两个

classNames=["1",[1,2,3],"2","2"]
classNames.remove("2")
print(classNames)

9.

classNames=["1",[1,2,3],"2","2"]
classNames.clear()
print(classNames)

10.

classNames=["1",[1,2,3],"2","2"]print(classNames.count("2"))

11.

classNames=["1",[1,2,3],"2","2"]print(len(classNames))

二、列表的循环遍历

1.while

def forNames():list=["lisi","zhangsan","ww"]count=0while(count<len(list)):print(list[count])count+=1forNames()

2.for(重点)

def forNames():list=["lisi","zhangsan","ww"]count=0for name in list:print(name)forNames()
#对比java for(int i=0;i<list.length();i++) 还是有一定的区别的

三、元组

1.

tuple1=("zhangsan")
print(type(tuple1))

2.支持嵌套并且下标访问

tuple=(1,None,True,[12,3,4],(1,2,3,4))tuple1=("zhangsan")
print(tuple[4][3])

3、主要操作比较少，另外的for，与while用法完全跟list一样

四、字符串常见操作（重点）

1.