Exceptional handling for Zero Division Error

# if value of x is given as zero the zero divison error generates and program terminates
x=int(raw_input('Enter the number of students failed:'))
y=100/x
print y


# If x is not defined itself the program not terminated instead it goes to except loop
try:
    x=int(raw_input('Enter the number of students failed:'))
    y=100/x
    print y
except ZeroDivisionError:
    x=1
    y=100/x
    print y