内置函数

import  random
"""
chr()  #unicode 表里的对应关系
ord()

"""
# print(chr(65))
# print(ord("B"))

#1<=i<5
# i =random.randrange(1,5)

# li =[]
# for i in range(6):
#      temp = random.randrange(65,91)
#      c = chr(temp)
#      li.append(c)
# result = "".join(li)
# print (result)

#随机验证码
li =[]
for i in range(6):
     r = random.randrange(1,5)
     if r ==1 or r == 4:
         num=random.randrange(1,10)
         li.append(str(num))
     else:
        temp = random.randrange(65,91)
        c = chr(temp)
        li.append(c)
result = "".join(li)
print (result)

 """

将字符串编译成python代码compile()

single,exec,eval

执行代码exec()"""

# s = "print(123)"#

rel= compile(s,'','exec')

# exec(rel)

#杳看对象都提供了哪些功能

# print(dir(list))

# print(help(list))

#两个数的商和余数

r=divmod(99,10)

#判断是否是某个类的实例
print(isinstance('jack',str))