User Defined function not working

[Raj_Kumar]

Hi

iam very beginner to python. my query is, i wrote user defined function(num()) to take input value (list item). if input value is not in the list item then again i want to ask input value (i.e. Again i want to call udf(inputnumber). While executing the code when i calling the function, code showing no error but executing nothing.

def num():
    n = int(input("Enter a list item: "))    
num()

a=[56,34,29,39]
if n in a :
    print("Given number index in the list is : ", a.index(n))
else:
    print("input value is not in the list item")
    num()

Ex: if input value is 30 then code should call function(num) and again ask input value till input value in the list.