Python的常用内置对象
列表和元组
- 简单数据类型
- 整型<class ‘int’>
- 浮点型<class ‘float’>
- 布尔型<class 'bool
- 容器数据类型
- 列表<class ‘list’>
- 元组<class ‘tuple’>
- 字典<class ‘dict’>
- 集合<class ‘set’>
- 字符串<class ‘str’>
一.列表
1.列表的定义
列表是有序集合，没有固定大小，能够保存任意数量任意类型的 Python 对象，语法为 [元素1, 元素2, …, 元素n]
2.列表的创建
a.利用range()创建列表
x=list(range(10))
print(x,type(x))
#[0,1,2,3,4,5,6,7,8,9] <class 'list'>
x=list(range(1,11,2))
print(x,type(x))
#[1,2,3,4,5,6,7,8,9,10] <class 'list'>
x=list(range(10,1,-2))
print(x,type(x))
#[10,8,6,4,2] <class 'list'>
b.利用推导式创建列表
x = [0] * 5
print(x, type(x))
# [0, 0, 0, 0, 0] <class 'list'>
x = [0 for i in range(5)]
print(x, type(x))
# [0, 0, 0, 0, 0] <class 'list'>
x = [i for i in range(10)]
print(x, type(x))
# [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] <class 'list'>
x = [i for i in range(1, 10, 2)]
print(x, type(x))
# [1, 3, 5, 7, 9] <class 'list'>
x = [i ** 2 for i in range(1, 10)]
print(x, type(x))
# [1, 4, 9, 16, 25, 36, 49, 64, 81] <class 'list'>
x = [i for i in range(100) if (i % 2) != 0 and (i % 3) == 0]
print(x, type(x))
#[3, 9, 15, 21, 27, 33, 39, 45, 51, 57, 63, 69, 75, 81, 87, 93, 99] <class 'list'>
c.创建一个混合列表
mix = [1, 'lsgo', 3.14, [1, 2, 3]]
print(mix, type(mix))
# [1, 'lsgo', 3.14, [1, 2, 3]] <class 'list'>
