Python Reverse the binary equivalent of input and output the integer equivalent of the reverse binary

Am supposed to capture user input as an integer, convert to a binary, reverse the binary equivalent and convert it to an integer.Am getting the right output but someone says the solution is wrong. Where is the problem?

x  = 0

while True:

    try:
        x = int(raw_input('input a decimal number \t'))

        if x in xrange(1,1000000001):

            y = bin(x)

            rev = y[2:]

        print("the reverse binary soln for the above is %d") %(int('0b'+rev[::-1],2))       
            break

    except ValueError:
        print("Please input an integer, that's not an integer")
        continue

x  = 0

There is no point in doing this. You just replace it anyways

while True:

    try:
        x = int(raw_input('input a decimal number \t'))

        if x in xrange(1,1000000001):

Probably better to use if 1 <= x <= 100000000001: although I'm really not sure why you are doing this check. Also, you should probably explain to the user that you've reject the number.

y = bin(x)

            rev = y[2:]

I'd use reversed = bin(x)[:1::-1] rather then splitting it out across the tree lines.

print("the reverse binary soln for the above is %d") %(int('0b'+rev[::-1],2))

I'd convert the number before the print to seperate output from the actual math.

break

    except ValueError:
        print("Please input an integer, that's not an integer")
        continue

This continue does nothing.

StackExchange Code Review Q#20965, answer score: 5