Day4 built-in function supplement, adorner

Li = [11,22,33,44]
def f1 (ARG):
    Arg.append (55)
#函数默认返回值None, the function argument is passed a reference
Li = F1 (LI)

Print (LI)

Built-in function supplement: Determine if it is called

Def f1 ():

Pass

Print (callable (F1))

ASCII code and digital conversion

#数字转换为ASCII码
r = Chr (65)
Print (R)
#ASCII转换为数字
n = Ord (' a ')
Print (n)

Random Verification Code

Import Random
List_temp =[]
For I in range (10):
    R = Random.randrange (0,10)
    if r = = 2 or R = = 4 or R = = 9:
        num = Random.randrange (0, 10)
        List_temp.append (num)
    Else
        temp = Random.randrange (65, 91)
        c = Chr (temp)
        List_temp.append (c)
result = "". Join (List_temp)
Print (Result)

Compile, execute

s = "Print (123)"
#编译: Single, eval (expression), exec (compiled into Python)
#将字符串编译成python代码
R = Compile (s, "<string>", "exec")
#exec执行python代码, no return value
EXEC (R)

#eval只执行表达式, there are return results
box = "8 * 8"
ret = eval (box)
Print (ret)

Day4 built-in function supplement, adorner