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()