unexpected EOF while parsing

[whatloop]

On executing the script the python prompts for number until the user enters null as an input

def main():
        total = 0 
        number = input('Enter a number : ')
        while number != '':
                total += int(number)
                number = input('Enter a number : ')
        print('Sum of all input number is : ',total)
if __name__=='__main__':
        main()

Error

python sumNumbers.py 
Enter a number : 2
Enter a number : 2
Enter a number : 2
Enter a number : 
Traceback (most recent call last):
  File "sumNumbers.py", line 9, in <module>
    main()
  File "sumNumbers.py", line 6, in main
    number = input('Enter a number : ')
  File "<string>", line 0
    
    ^
SyntaxError: unexpected EOF while parsing