The problem of apply (pd.qcut)

Hello, everyone. I"m learning the function qcut. There are some problems.

a = pd.Series(range(10))
pd.qcut(a,3)

No problem.
but there is a problem here:

a.apply(pd.qcut,3)

says there is a duplicate bins. I added the following parameters:

a.apply(pd.qcut,3,duplicates="drop")

still no. Ask how to write this formula in apply

Mar.14,2021
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