Help to understand my mistake

[TeeMan]

Do not 1-space as indentation,in Python is always 4-space.

I admit to having only small bases in Python, certainly, I know a few things, but you have just taught me something ! But why necessarily 4 spaces and not one ?

In any case, it seems to work so thank you very much, I just get the following error, but I will look at my side, I probably have trouble copying something somewhere; out of curiosity, I give you my model concerning this part (here), without doubt I have it badly adapted :

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
    self.run()
  File "GPS.py", line 38, in run
    while gpsp.running:
NameError: global name 'gpsp' is not defined