Can I add else and why I have error there?

I have an error and I think why the teacher doesn’t use else in the code below.

def is_leap(year):
  if year % 4 == 0:
    if year % 100 == 0:
      if year % 400 == 0:
        return True
      else:
        return False
    else:
      return True
  else:
    return False

def days_in_month():
  month_days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]  
  if is_leap(year) and month == 2:
      return 29
  else:
  return month_days[month-1]
  
#🚨 Do NOT change any of the code below 
year = int(input("Enter a year: "))
month = int(input("Enter a month: "))
days = days_in_month(year, month)
print(days)

I got this error. I was checking and I have the same teacher but I still get this error.

Enter a month: 2
Traceback (most recent call last):
  File "main.py", line 22, in <module>
    days = days_in_month(year, month)
TypeError: days_in_month() takes 0 positional arguments but 2 were given

>Solution :

You pass two arguments into days_in_month, even though it is a function that doesn’t take in any arguments.

The function signature for days_in_month should be:

def days_in_month(year, month):