TypeError: 'str' 对象在使用列表时不可调用

Question

I'm trying to get it so that if the user enters something from the list, it will print the message. However, I'm met with a

"TypeError: 'str' object is not callable".

li = "One,Two,Three,Four"
a,b,c,d = li.split(",")
number = input("Enter Number")

if input == li(a,b,c,d):
    print("Message")

Answer 1

If you want to check if an object is one of the elements of a list, you need to use the in operator, not the == operator:

if number in (a,b,c,d):
    # Here^
    print("Message")

Answer 2

There's no need to define the entries together just to separate them later; also you can directly check if an entry is in your list:

entries = ["One", "Two", "Three", "Four"]
number = input("Enter Number: ")
if number in entries:
    print("Message")

For large datasets consider using a set instead of a list for entries.