serial module

[Ron Eggler]

Hoi,

I'm trying to connect to a serial port and always get the error
"serial.serialutil.SerialException: Port is already open." whcih is untrue. 
I have no serial port open yet, my code looks like this:
#!/usr/bin/python
import time
import serial

# configure the serial connections (the parameters differs on the device
# you are connecting to)
ser = serial.Serial(
        port='/dev/ttyUSB0',
        baudrate=19200,
        parity=serial.PARITY_ODD,
        stopbits=serial.STOPBITS_TWO,
        bytesize=serial.SEVENBITS
)

ser.open()

Why do I get this error?

Thank you,
Ron

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