Sage code that receives a symmetric partition as an input and returns the corresponding partition with odd parts.

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Not sure if what you meant was to convert a partition with all parts distinct to a partition where each part is odd. If it was, then, following the bijection from page 10 here and assuming you are representing a partition p as a list of natural numbers results in something of the form:

sorted([x.odd_part() for x in p for i in range(x/x.odd_part())],reverse=True)