day05_08 列表讲解、切片、内置方法

 

1.0 查询:

a = ['wuchao','jinxing','xiaohu','sanpang','ligang']
print(a[3])
#>>>sanpang
print(a[1:3])
#>>>['jinxing', 'xiaohu']
print(a[:])
#>>>['wuchao', 'jinxing', 'xiaohu', 'sanpang', 'ligang']
print(a[1:-1])
#>>>['jinxing', 'xiaohu', 'sanpang']
print(a[1:-1:2])
#>>>['jinxing', 'sanpang']
print(a[3:0:-2])
#>>>['sanpang', 'jinxing']
b = (a[::-1])
print (b)
#>>>['ligang', 'sanpang', 'xiaohu', 'jinxing', 'wuchao']

　　

2.0 增加(append):

a = ['wuchao','jinxing','xiaohu','sanpang','ligang']
a.append('xuepeng') #只能在末尾添加,无返回值
print(a)
#>>>['wuchao', 'jinxing', 'xiaohu', 'sanpang', 'ligang', 'xuepeng']

2.1 增加(insert)

a = ['wuchao','jinxing','xiaohu','sanpang','ligang']
a.insert(1,'xuepeng')#1代表位置
print(a) #无返回值
#>>>['wuchao', 'xuepeng', 'jinxing', 'xiaohu', 'sanpang', 'ligang']

　

3.0 修改(有添加多个列表的功能)　

a = ['wuchao','jinxing','xiaohu','sanpang','ligang']
a[1] = 'haidilao' #修改1为'haidilao'
print(a)
#>>>['wuchao', 'haidilao', 'xiaohu', 'sanpang', 'ligang']
a[1:3]=['a','b'] #修改1,2位'a','b'
print(a)
#>>>['wuchao', 'a', 'b', 'sanpang', 'ligang']
a[0:0] = ['2','1','3']
print(a)
#>>>['2', '1', '3', 'wuchao', 'a', 'b', 'sanpang', 'ligang']
a[1:1] =['o','p']
print(a)
#>>>['2', 'o', 'p', '1', '3', 'wuchao', 'a', 'b', 'sanpang', 'ligang']

　　

 4.0 删除(remove)

a = ['wuchao','jinxing','xiaohu','sanpang','ligang']
a.remove('wuchao') #等同于a.remove(a[0])
print(a) #无返回值
#>>>['jinxing', 'xiaohu', 'sanpang', 'ligang']

4.1 删除(pop)

a = ['wuchao','jinxing','xiaohu','sanpang','ligang']
b = a.pop (1) #把编号1删除,并且有返回值
print (a)
print (b)
#>>>['wuchao', 'xiaohu', 'sanpang', 'ligang']
#>>>jinxing

4.3 删除(del)

a = ['wuchao','jinxing','xiaohu','sanpang','ligang']
del a[0]
print(a)
#>>>['jinxing', 'xiaohu', 'sanpang', 'ligang']
del a
print(a)
#>>> NameError: name 'a' is not defined(直接报错,直接把变量给删除了)