class NegativeMarksError(Exception):
   pass

def check_marks(mark):
    try:

        if(mark < 0):
            raise NegativeMarksError

        if(mark > 50):
            print('pass')
        else:
            print('fail')
    except ValueError:
        print('ValueError: Some value error')
    except TypeError:
        print('TypeError: Cannot convert into int')
    except NegativeMarksError:
        print('Negative Marks are not allowed')

check_marks(10)

fail

check_marks('10')

TypeError: Cannot convert into int

check_marks(-10)

Negative Marks are not allowed