semn = ""
def asemn():
    global semn
    if semn != '+' or '×' or '÷' or '*':
        semn = input("Semn:")
        print(semn)
        asemn()
asemn():
The code that I used for numbers:
def anum1():
        global num1
        if num1.isnumeric() == False:
            num1 = input("Primul numar:")
            anum1()
anum1()
 
    