Pipe input to Python program and later get input from user

Let's say I want to pipe input to a Python program, and then later get input from the user, on the command line.

echo http://example.com/image.jpg | python solve_captcha.py

and the contents of solve_captcha.py are:

import sys 
image_url = sys.stdin.readline()

# Download and open the captcha...

captcha = raw_input("Solve this captcha:")
# do some processing...

The above will trigger a EOFError: EOF when reading a line error.

I also tried adding a sys.stdin.close() line, which prompted a ValueError: I/O operation on closed file.

Can you pipe information to stdin and then later get input from the user?

Note: This is a stripped down, simplified example - please don't respond by saying "why do you want to do that in the first case," it's really frustrating. I just want to know whether you can pipe information to stdin and then later prompt the user for input.