def zip_expand(x, y):
if isinstance(x, list) and isinstance(y, list):
if len(x) != len(y):
raise Vips.Error("zip_expand list args not equal length")
return list(zip(x, y))
elif isinstance(x, list):
return [[i, y] for i in x]
elif isinstance(y, list):
return [[x, j] for j in y]
else:
return [[x, y]]
