Your series contains other pd.Series
objects. This is bad practice. In general, you should ensure your series is of a fixed type to enable you to perform manipulations without having to check for type
explicitly.
Your error is due to pd.Series
objects not being hashable. One workaround is to use a function to convert pd.Series
objects to a hashable type such as tuple
:
s = pd.Series(['one string', 'another string', pd.Series([1, 2, 3])])
def converter(x):
if isinstance(x, pd.Series):
return tuple(x.values)
else:
return x
res = s.apply(converter).unique()
print(res)
['one string' 'another string' (1, 2, 3)]