1
# print('hello,world~')
2
# print(123)
3
# print(12.3)
4

5
# print('hello',end=' ')
6
# print('world~')
7

8
# print(1,2,3,4,5,sep=':')

1
# a = 1
2
# b = 2
3
# print(a)
4
# print(b)
5

6
# a,b,c = 1,2,3
7
# print(a,b,c)
8

9
# a = 10
10
# b = 20
11
# c = 0
12
# print(a,b)
13
# c = a
14
# a = b
15
# b = c
16
# print(a,b)
17

18
# a,b = b,a
19
# print(a,b)

1
# a = 1
2
# print(a)
3
# print(type(a))
4

5
# from decimal import Decimal
6
# n1 = 1.1
7
# n2 = 2.2
8
# print(Decimal('1.1') + Decimal('2.2'))
9
# print(type(n1))
10
# print(n1+n2)
11

12

13
# print(1+True)
14
# print(1+False)
15

16

17
# ''      单行字符串
18
# "   "   通常表示句子
19
# '''     表示段落
20
# '''
21
# """
22
# """
23

24

25
# str = 'xiaoming'
26
# str2 = "this is my world！"
27
# str3 = '''
28
# 小明
29
# 小红
30
# 小兰
31
# 效率
32
# '''
33

34
# print(str)
35
# print(str2)
36
# print(str3)
37

38

39
# str(),int(),float(),bool()
40

41
# a = 123
42
# print('a变量的类型：',type(a))
43
# b = str(a)
44
# print('b变量的类型：',type(b))
45
# c =int(b)
46
# print('c变量的类型：',type(c))
47
# d = float(c)
48
# print('d变量的类型：',type(d))
49
# e = bool(d)
50
# print('e变量的类型：',type(e))

1
# str(),int(),float(),bool()
2

3
# a = 123
4
# print('a变量的类型：',type(a))
5
# b = str(a)
6
# print('b变量的类型：',type(b))
7
# c =int(b)
8
# print('c变量的类型：',type(c))
9
# d = float(c)
10
# print('d变量的类型：',type(d))
11
# e = bool(d)
12
# print('e变量的类型：',type(e))
13

14

15
print(ord('a'))
16
print(chr(92))

1
print(11)
2
print(0b11)
3
print(0o11)
4
print(0x11)
5

6
print(bin(3))
7
print(oct(9))
8
print(hex(17))

1
# print(r'he\nllo,\nworld!')
2

3

4
# print('hel\tlo,wor\tld.')
5

6
#\r  将光标移到本行开头
7
# a =10
8
# b = '小明'
9
# print(f'我朋友{b}今年胖了{a}斤')
10

11
import time
12
for i in range(6):  #0-5
13
    print(f'\r你的节操掉了{5-i}斤',end='')
14
    time.sleep(1)

1
str = '123456789'
2
# print(str)
3
# print(str[0])
4
# print(str[2:5])     #左闭右开[2,5)
5
# print(str[0:-1])    #左闭右开[0,8)
6
# print(str[3:])
7
# print(str[1:5:2])
8
# print(str[1::2])
9
# print(str[::2])
10
# print(str[::-1])
11
# print(str*2)

1
# 列表      []    list
2
# 集合      {}    set
3
# 元组      ()    tuple
4
# 字典      {}    dict
5

6
# 1.列表：可以重复，可以修改。购物车信息
7
# 2.集合：可以修改，但是不能重复。无序的。记录兴趣爱好等数据。打篮球。
8
# 3.元组：创建完就无法改变。安全性高一些。
9
# 4.字典：键和值。学校系统，记录学生信息。学号：学生其他信息。
10

11

12

13
# a  = []
14
# print(type(a))
15

16
a = [1,2,3,4,5,6,7,8,9]
17
# print(a)
18
# a[2] = 'a'
19
# a[3] = 'a'
20
# a[4] = 'a'
21
# print(a)
22
# a[2:6] = 'a'
23
# print(a)
24

25
# a[3] = [1,2,3]
26
# print(a)
27
# print(a[3][1])
28

29
# print(max(a))
30
# a.append(88)
31
# print(a)
32
# print(a.index(8))
33
# print(a.pop())
34
# print(a)
35
# print(a.pop(3))
36
# print(a)
37
# a.remove(2)
38
# print(a)
39
# print(len(a))
40

41

42
#元组
43
# a = (1,2,3)
44
# print(a)
45
# print(type(a))
46
# print(a[1])
47
# a[1] = 99
48
# print(a)
49

50

51
#集合  set
52
#可以去除重复
53
# a = {}
54
# print(type(a))
55
# b = set()
56
# b.add(10)
57
# print(type(b))
58
# print(b)
59

60
# c = {1,2,3,4,5,6,7,8,9}
61
# print(c)
62
# print(type(c))