| 1 | import re, math,string |
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| 2 | #Input -> new scale -> Output |
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| 3 | |
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| 4 | unit1= "A^{-1} "# x A^{-1} |
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| 5 | unit2= "A" # x A |
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| 6 | unit3="A" # x^2 A^{2} |
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| 7 | unit4= "A " # 1/x A^{-1} |
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| 8 | unit5= "A^{0.5} " # x^2 A |
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| 9 | unit9= "m^{1/2}" # x^2 m |
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| 10 | |
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| 11 | #If you don't recognize the pattern, give up and just put some parentheses around the unit and write the transoformation: |
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| 12 | |
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| 13 | unit6= "m/s" # x^2 (m/s)^{2} |
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| 14 | unit7= "m/s^{2}" # 1/x (m/s^{2})^{-1} |
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| 15 | unit8= "m/s^{4}" # x^2 (m/s^{4})^{2} |
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| 16 | |
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| 17 | |
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| 18 | def UnitConvertion(pow,unit): |
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| 19 | if pow!=0: |
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| 20 | if string.find(unit, "^") !=-1:# if the unit contains a power ^ |
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| 21 | unitSplitted= re.split("\^",unit) |
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| 22 | if string.find(unitSplitted[0],"/")!=-1 or\ |
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| 23 | string.find(unitSplitted[0],"-")!=-1 : # find slash / |
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| 24 | if pow==1: |
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| 25 | unit = unit |
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| 26 | else: |
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| 27 | unit= "("+unit+")"+"^{"+str(pow)+"}" |
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| 28 | else: |
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| 29 | if string.find(unitSplitted[1],"{")!=-1:# if found a { |
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| 30 | findPower= re.split("{",unitSplitted[1]) |
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| 31 | if string.find(findPower[1],"}")!=-1:# found } |
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| 32 | unitPower= re.split("}",findPower[1]) |
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| 33 | if (string.find(unitPower[0],".")!=-1): |
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| 34 | power= float(unitPower[0])*pow |
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| 35 | elif (string.find(unitPower[0],"/") !=-1 ): #power is a float |
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| 36 | poweSplitted= re.split("/",unitPower[0]) |
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| 37 | power=pow*int(poweSplitted[0])/int(poweSplitted[1]) |
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| 38 | else: |
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| 39 | power= int(unitPower[0])*pow |
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| 40 | |
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| 41 | if power==1.0: |
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| 42 | unit = unitSplitted[0] |
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| 43 | elif power==0.5: |
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| 44 | unit = unitSplitted[0]+"^{1/2}" |
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| 45 | elif power==-0.5: |
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| 46 | unit = unitSplitted[0]+"^{-1/2}" |
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| 47 | else: |
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| 48 | unit= unitSplitted[0]+"^{"+str(power)+"}" |
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| 49 | else: |
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| 50 | raise ValueError, "missing } in unit expression" |
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| 51 | |
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| 52 | |
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| 53 | |
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| 54 | else:#no power |
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| 55 | if pow !=1: |
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| 56 | unit="("+unit+")"+"^{"+str(pow)+"}" |
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| 57 | else: |
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| 58 | raise ValueError, "empty unit ,enter a power different from zero" |
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| 59 | return unit |
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| 60 | if __name__ == "__main__": |
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| 61 | print "this unit1 %s ,its power %s , and value %s"%(unit1,1,UnitConvertion(1,unit1)) |
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| 62 | print "this unit2 %s ,its power %s , and value %s"%(unit2,1,UnitConvertion(1,unit2)) |
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| 63 | print "this unit3 %s ,its power %s , and value %s"%(unit3,2,UnitConvertion(2,unit3)) |
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| 64 | print "this unit4 %s ,its power %s , and value %s"%(unit4,-1,UnitConvertion(-1,unit4)) |
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| 65 | print "this unit5 %s ,its power %s , and value %s"%(unit5,2,UnitConvertion(2,unit5)) |
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| 66 | print "this unit6 %s ,its power %s , and value %s"%(unit6,2,UnitConvertion(2,unit6)) |
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| 67 | print "this unit7 %s ,its power %s , and value %s"%(unit7,-1,UnitConvertion(-1,unit7)) |
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| 68 | print "this unit8 %s ,its power %s , and value %s"%(unit8,2,UnitConvertion(2,unit8)) |
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| 69 | print "this unit9 %s ,its power %s , and value %s"%(unit9,2,UnitConvertion(2,unit9)) |
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| 70 | |
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