if not cls[0].__bases__:
return cls
else:
return cls+ mro_C3(*cls[0].__bases__)
else:
seqs = [list(mro_C3(C)) for C in cls ] +[list(cls)]
res = []
while True:
non_empty = list(filter(None, seqs))
if not non_empty:
return tuple(res)
for seq in non_empty:
candidate = seq[0]
not_head = [s for s in non_empty if candidate in s[1:]]
if not_head:
candidate = None
else:
break
if not candidate:
raise TypeError("inconsistent hierarchy, no C3 MRO is possible")
res.append(candidate)
for seq in non_empty:
if seq[0] == candidate:
del seq[0]
