c = 'C:\windows\nt'
c = 'C:\\windows\\nt'

c = r'C:\windows\nt'

a = 'abc'
b = 123
c = f'{a}********{b}'
c
'abc********123'

test = [] 
bool(test)
# 返回False

type(1) == int # 注意不能是'int' 这样'int'表示为字符串
# 返回True 

type(list), type(str) ,type(type)
(type,type,type) # type # type 是元类

type(True) == bool
True

isinstance(1, int)
True
isinstance(1, str)
False
isinstance(True, bool)
True
isinstance(1,(str, list, tuple, int)) ## 其中有一个符合返回True
True

x = input('>>>') ## 阻塞输入，返回一个字符串
>>>
print(x)
123

print(1, 2, 3, [], [1,2,3],sep='\t\t')
print(1, 2, 3, sep='#',end='\t') # 间隔使用 # 最后使用\t

print (math. ceil (1.0), math.ceil (1.3), math.ceil (1.5), math.ceil (1.6), math.ceil (1.8))
1 2 2 2 2
print (math.floor (1.0), math. floor (1.3), math. floor (1.5), math. floor (1.8), math. floor (2.0))
1 1 1 1 2
math.ceil (-1.0), math.ceil (-1.3), math.ceil (-1.5), math.ceil (-1.6), math.ceil (-1.8)
(-1, -1, -1, -1, -1)
math.floor (-1.0), math. floor (-1.3), math. floor (-1.5), math. floor (-1.8), math. floor (-2. 9)
(-1, -2 ,-2 ,-2 ,-2 )

import pymysql

# 创建数据库连接
conn = pymysql.connect(host='localhost', user='root', password='password', database='mydb')

# 创建游标对象
cursor = conn.cursor()

# 查询表是否存在
cursor.execute("SHOW TABLES LIKE 'k8s_memory_7d_use'")
result = cursor.fetchone()

# 如果表不存在，则创建表
if not result:
    cursor.execute("""
        CREATE TABLE k8s_memory_7d_use (
            id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
            k8s_cluster VARCHAR(50) NOT NULL,
            namespace VARCHAR(50) NOT NULL,
            pod VARCHAR(50) NOT NULL,
            instance VARCHAR(50) NOT NULL,
            memory_7d_arrive_now_max_unit_M INT(11) NOT NULL,
            Memory_Limit_M INT(11) NOT NULL,
            Memory_Use_percentage FLOAT(6,2) NOT NULL
        )
    """)
    print("Table k8s_memory_7d_use created successfully")

# 关闭游标和连接
cursor.close()
conn.close()