unexpected EOF while parsing

[snippsat]

You never break out of the loop.
In a function can use return as return always get value out and exit function.
indentation is 4-space not 8.

def main():
    total = 0
    number = input('Enter a number : ')
    while number != '':
        total += int(number)
        number = input('Enter a number : ')
    return f'Sum of all input number is : {total}'

if __name__=='__main__':
    print(main())