battery value sometimes are not returned

[ntnxcrex]

copied battey python script, sometimes it return no values with error:
running on raspberry. Awesome work indeed!!!

pi@raspberrypi:~ $ python battery.py
WARNING: No module named pexpect
Voltage: 0.69384765625
Voltage: 0.694091796875
Voltage: 0.69384765625
Voltage: 0.694091796875
Traceback (most recent call last):
File "battery.py", line 10, in
print ("Value: " % hub.voltage.last_value)
TypeError: not all arguments converted during string formatting
pi@raspberrypi:~ $ python battery.py
WARNING: No module named pexpect
Traceback (most recent call last):
File "battery.py", line 10, in
print ("Value: " % hub.voltage.last_value)
TypeError: not all arguments converted during string formatting

[undera]

That line misses proper formatting. Right statement is print ("Value: %s" % hub.voltage.last_value)