| 1 | """ |
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| 2 | Convert units to strings that can be displayed |
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| 3 | This is a cleaned up version of unitConverter.py |
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| 4 | """ |
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| 5 | from __future__ import print_function |
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| 6 | |
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| 7 | import re |
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| 8 | import string |
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| 9 | |
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| 10 | def convert_unit(power, unit): |
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| 11 | """ |
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| 12 | Convert units to strings that can be displayed |
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| 13 | """ |
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| 14 | if power != 0: |
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| 15 | if unit.find("^") != -1: # if the unit contains a powerer ^ |
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| 16 | toks = re.split(r"\^", unit) |
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| 17 | if toks[0].find("/") != -1 or \ |
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| 18 | toks[0].find("-") != -1: |
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| 19 | if power == 1: |
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| 20 | unit = unit |
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| 21 | else: |
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| 22 | unit = "(" + unit + ")" + "^{" + str(power) + "}" |
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| 23 | else: |
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| 24 | if toks[1].find("{") != -1: # if found a { |
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| 25 | find_power_toks = re.split("{", toks[1]) |
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| 26 | if find_power_toks[1].find("}") != -1: # found } |
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| 27 | unit_toks = re.split("}", find_power_toks[1]) |
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| 28 | if unit_toks[0].find(".") != -1: |
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| 29 | powerer = float(unit_toks[0]) * power |
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| 30 | elif unit_toks[0].find("/") != -1: |
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| 31 | power_toks = re.split("/", unit_toks[0]) |
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| 32 | powerer = power * int(power_toks[0])\ |
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| 33 | / int(power_toks[1]) |
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| 34 | else: |
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| 35 | powerer = int(unit_toks[0]) * power |
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| 36 | |
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| 37 | if powerer == 1.0: |
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| 38 | unit = toks[0] |
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| 39 | elif powerer == 0.5: |
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| 40 | unit = toks[0] + "^{1/2}" |
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| 41 | elif powerer == -0.5: |
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| 42 | unit = toks[0] + "^{-1/2}" |
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| 43 | else: |
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| 44 | unit = toks[0] + "^{" + str(powerer) + "}" |
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| 45 | else: |
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| 46 | raise ValueError("missing } in unit expression") |
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| 47 | else: # no powerer |
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| 48 | if power != 1: |
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| 49 | unit = "(" + unit + ")" + "^{" + str(power) + "}" |
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| 50 | else: |
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| 51 | raise ValueError("empty unit, enter a power different from zero") |
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| 52 | return unit |
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| 53 | |
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| 54 | |
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| 55 | if __name__ == "__main__": |
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| 56 | # pylint: disable=invalid-name |
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| 57 | # Input -> new scale -> Output |
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| 58 | unit1 = "A^{-1} " # x A^{-1} |
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| 59 | unit2 = "A" # x A |
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| 60 | unit3 = "A" # x^2 A^{2} |
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| 61 | unit4 = "A " # 1/x A^{-1} |
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| 62 | unit5 = "A^{0.5} " # x^2 A |
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| 63 | unit9 = "m^{1/2}" # x^2 m |
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| 64 | |
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| 65 | # If you don't recognize the pattern, give up |
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| 66 | # and just put some parentheses around the unit and write the transoformation: |
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| 67 | |
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| 68 | unit6 = "m/s" # x^2 (m/s)^{2} |
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| 69 | unit7 = "m/s^{2}" # 1/x (m/s^{2})^{-1} |
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| 70 | unit8 = "m/s^{4}" # x^2 (m/s^{4})^{2} |
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| 71 | |
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| 72 | print("this unit1 %s ,its powerer %s , and value %s" % (unit1, 1, convert_unit(1, unit1))) |
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| 73 | print("this unit2 %s ,its powerer %s , and value %s" % (unit2, 1, convert_unit(1, unit2))) |
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| 74 | print("this unit3 %s ,its powerer %s , and value %s" % (unit3, 2, convert_unit(2, unit3))) |
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| 75 | print("this unit4 %s ,its powerer %s , and value %s" % (unit4, -1, convert_unit(-1, unit4))) |
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| 76 | print("this unit5 %s ,its powerer %s , and value %s" % (unit5, 2, convert_unit(2, unit5))) |
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| 77 | print("this unit6 %s ,its powerer %s , and value %s" % (unit6, 2, convert_unit(2, unit6))) |
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| 78 | print("this unit7 %s ,its powerer %s , and value %s" % (unit7, -1, convert_unit(-1, unit7))) |
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| 79 | print("this unit8 %s ,its powerer %s , and value %s" % (unit8, 2, convert_unit(2, unit8))) |
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| 80 | print("this unit9 %s ,its powerer %s , and value %s" % (unit9, 2, convert_unit(2, unit9))) |
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