UnicodeDecodeError using Python 3.4

[Gonzalo]

Hi
I'm using Python 3.4 in Ubuntu 14.04, and when I start my-weather-indicator I get this error:

Traceback (most recent call last):
  File "./my-weather-indicator", line 43, in <module>
    import comun
  File "/opt/extras.ubuntu.com/my-weather-indicator/share/my-weather-indicator/comun.py", line 123, in <module>
    line = f.readline()
  File "/usr/lib/python3.4/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 4209: ordinal not in range(128)

From what I've gathered, this is a problem with how Python 3 does the decoding of the file when opening with default options. My files and locale enconding are in UTF-8, yet it seems to be trying to open them with ascii.