python - Bijective relations between ranges and some constants? -

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please, move question code review -area. better suited there because know code below junk , wanted critical feedback complete rewrite.

how can write set-to-constants relations in python? if a in range, return corresponding constant.

[0,10]    <-> ]10,77]   <-> b ]77,\inf[ <-> c

smelling code, bad.

    # bad style      provsum=0       # trial 1: messy if-clauses     sold in getselling():             if (sold >=0 & sold <7700):                     rate =0.1              else if (sold>=7700 & sold <7700):                #won't correct mistakes here because shows how not things                     rate =0.15             else if (sold>=7700):                     rate =0.20       # trial 2: messy, broke because getting hard read     provisions= {"0|2000":0.1, "2000|7700":0.15, "7700|99999999999999":0.20}       if int(sold) >= int(border.split("|")[0]) & int(sold) < int(border.split("|")[1]):             print sold, rate             provsum = provsum + sold*rate

if list longer mere 3 entries, use bisect.bisect():

limits = [0, 2000, 7700] rates = [0.1, 0.15, 0.2] index = bisect.bisect(limits, sold) - 1 if index >= 0:     rate = rates[index] else:     # sold negative

but seems bit overengineered 3 values...

edit: on second thought, readable variant is

if sold >= 7700:     rate = 0.2 elif sold >= 2000:     rate = 0.15 elif sold >= 0:     rate = 0.1 else:     # sold negative

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