In python

I need help to fix this code in a simple and easy way to follow the code

so the program that outputs all sub strings of an input

EX. BCBD - B, C, B, D, BC, CB, BD, BCB, CBD, BCBD

then remove duplicate

B, C, D, BC, CB, BD, BCB, CBD, BCBD

code

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Str ="BCBD def subString(Str,n): for Len in range(1,n + 1): for i in range(n - Len + 1): j = i + Len - 1 for k in range(i,j + 1): subString(Str,len(Str))