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There are a couple of possible error scenarios here: either it can't open your serial port, or you don't have a good version of python installed (or something else). Since it still looks like you haven't pasted the complete output from the program, it's hard to tell exactly what is wrong.

If I run rosserial_python and my serial port doesn't exist, I get this message:

$ rosrun rosserial_python serial_node.py /dev/ttyACM0
[INFO] [WallTime: 1458751932.062218] ROS Serial Python Node
[INFO] [WallTime: 1458751932.064663] Connecting to /dev/ttyACM0 at 57600 baud
[ERROR] [WallTime: 1458751932.065596] Error opening serial: could not open port /dev/ttyACM0: [Errno 2] No such file or directory: '/dev/ttyACM0'

If I run rosserial_python and my version of python is broken, I get this message:

$ rosrun rosserial_python serial_node.py /dev/ttyACM0
/usr/bin/env: python: No such file or directory

There are a couple of possible error scenarios here: either it can't open your serial port, or you don't have a good version of python installed (or something else). Since it still looks like you haven't pasted the complete output from the program, it's hard to tell exactly what is wrong.

If I run rosserial_python and my serial port doesn't exist, I get this message:

$ rosrun rosserial_python serial_node.py /dev/ttyACM0
[INFO] [WallTime: 1458751932.062218] ROS Serial Python Node
[INFO] [WallTime: 1458751932.064663] Connecting to /dev/ttyACM0 at 57600 baud
[ERROR] [WallTime: 1458751932.065596] Error opening serial: could not open port /dev/ttyACM0: [Errno 2] No such file or directory: '/dev/ttyACM0'

If I run rosserial_python and my version of python is broken, I get this message:

$ rosrun rosserial_python serial_node.py /dev/ttyACM0
/usr/bin/env: python: No such file or directory