ImportError: No module named serial

~/py-arduino$ python -m py_arduino.cli.ping /dev/ttyACM0
Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/mnt/seguro/home/horacio/python/py-arduino/py_arduino/cli/ping.py", line 25, in <module>
    from py_arduino.main_utils import BaseMain
  File "py_arduino/main_utils.py", line 24, in <module>
    from py_arduino.arduino import PyArduino
  File "py_arduino/arduino.py", line 29, in <module>
    import serial
ImportError: No module named serial

This could happen because:

1. you forgot to install the dependencies
   • See How to install py-arduino.
2. you forgot to activate the virtualenv
   • See How to use py_arduino.cli.*.