Python AttributeError: 'module' object has no attribute 'Serial'
===

I'm trying to access a serial port with Python 2.6 on my Raspberry Pi running Debian.
My script named `start.py` tries to import pySerial:

    import serial
    ser = serial.Serial('/dev/ttyAMA0', 9600)
    ser.write("hello world!")

For some reason it refuses to establish the serial connection with this error:

    AttributeError: 'module' object has no attribute 'Serial'

When I try to type the same code in the interactive Python interpreter it still doesn't work.

Strangely, it used to work about a couple hours ago.

What could be the problem? I've tried to fix this for a while, installing pySerial again, rewriting my code, double-checking the serial port, etc.

Thanks in advance!