The Python code does not respect the RPi's locale setting by default.

[Short-bus]

Jérémie / (Bobleponge91) found that pilomar.py and libraries do not understand "," as a decimal separator within Python functions if the locale specifies that character.
As a workaround the RPi's locale needs to be set to one with "." as the decimal character such as "en_GB" or "en_US".
Is there anything simple which can be implemented to make the program more tolerant of other locales?

[Short-bus]

65rbeyer on Instructables reported the same problem with his build.

Traceback (most recent call last):
 File "pilomar.py", line 1206, in <module>
  SDCardMonitor = discmonitor(name='root',devname='/dev/root',path='/',disctype='boot',logger=MainLog.Log) # Create new disc space monitor for the SD card.
 File "/home/pi/pilomar/src/pilomardisc.py", line 54, in __init__
  self.Poll(force=True) # Kickstart the values.
 File "/home/pi/pilomar/src/pilomardisc.py", line 98, in Poll
  dfdict = self.GetDfDictionary()
 File "/home/pi/pilomar/src/pilomardisc.py", line 86, in GetDfDictionary
  v = int(float(v[:-1]) * ji[1]) # Convert from HR text value into absolute value.
ValueError: could not convert string to float: '4,2'

[Short-bus]

Some progress made here finally while investigating UTF-8 vs LATIN-1 character set issues.
The locale library can perform conversion of strings into the en_US numeric format.
My current development copy has been working smoothly with fr_FR language set, it now seems to recognise the different number format that the O/S commands can generate when the language is non English.