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Python/conversions/weight_conversion.py
Brian Evans dc6e77338c
Add stone unit of measuring weight (#5730) 
* Add stone unit of measuring weight

And some tests in the docs using an external calculator. Not yet tested if they pass.

* Fix rounding descrepencies in doctests to pass tests
2021-11-02 00:09:40 +01:00

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"""
Conversion of weight units.
__author__ = "Anubhav Solanki"
__license__ = "MIT"
__version__ = "1.1.0"
__maintainer__ = "Anubhav Solanki"
__email__ = "anubhavsolanki0@gmail.com"
USAGE :
-> Import this file into their respective project.
-> Use the function weight_conversion() for conversion of weight units.
-> Parameters :
-> from_type : From which type you want to convert
-> to_type : To which type you want to convert
-> value : the value which you want to convert
REFERENCES :
-> Wikipedia reference: https://en.wikipedia.org/wiki/Kilogram
-> Wikipedia reference: https://en.wikipedia.org/wiki/Gram
-> Wikipedia reference: https://en.wikipedia.org/wiki/Millimetre
-> Wikipedia reference: https://en.wikipedia.org/wiki/Tonne
-> Wikipedia reference: https://en.wikipedia.org/wiki/Long_ton
-> Wikipedia reference: https://en.wikipedia.org/wiki/Short_ton
-> Wikipedia reference: https://en.wikipedia.org/wiki/Pound
-> Wikipedia reference: https://en.wikipedia.org/wiki/Ounce
-> Wikipedia reference: https://en.wikipedia.org/wiki/Fineness#Karat
-> Wikipedia reference: https://en.wikipedia.org/wiki/Dalton_(unit)
-> Wikipedia reference: https://en.wikipedia.org/wiki/Stone_(unit)
"""
KILOGRAM_CHART: dict[str, float] = {
"kilogram": 1,
"gram": pow(10, 3),
"milligram": pow(10, 6),
"metric-ton": pow(10, -3),
"long-ton": 0.0009842073,
"short-ton": 0.0011023122,
"pound": 2.2046244202,
"stone": 0.1574731728,
"ounce": 35.273990723,
"carrat": 5000,
"atomic-mass-unit": 6.022136652e26,
}
WEIGHT_TYPE_CHART: dict[str, float] = {
"kilogram": 1,
"gram": pow(10, -3),
"milligram": pow(10, -6),
"metric-ton": pow(10, 3),
"long-ton": 1016.04608,
"short-ton": 907.184,
"pound": 0.453592,
"stone": 6.35029,
"ounce": 0.0283495,
"carrat": 0.0002,
"atomic-mass-unit": 1.660540199e-27,
}
def weight_conversion(from_type: str, to_type: str, value: float) -> float:
"""
Conversion of weight unit with the help of KILOGRAM_CHART
"kilogram" : 1,
"gram" : pow(10, 3),
"milligram" : pow(10, 6),
"metric-ton" : pow(10, -3),
"long-ton" : 0.0009842073,
"short-ton" : 0.0011023122,
"pound" : 2.2046244202,
"stone": 0.1574731728,
"ounce" : 35.273990723,
"carrat" : 5000,
"atomic-mass-unit" : 6.022136652E+26
>>> weight_conversion("kilogram","kilogram",4)
4
>>> weight_conversion("kilogram","gram",1)
1000
>>> weight_conversion("kilogram","milligram",4)
4000000
>>> weight_conversion("kilogram","metric-ton",4)
0.004
>>> weight_conversion("kilogram","long-ton",3)
0.0029526219
>>> weight_conversion("kilogram","short-ton",1)
0.0011023122
>>> weight_conversion("kilogram","pound",4)
8.8184976808
>>> weight_conversion("kilogram","stone",5)
0.7873658640000001
>>> weight_conversion("kilogram","ounce",4)
141.095962892
>>> weight_conversion("kilogram","carrat",3)
15000
>>> weight_conversion("kilogram","atomic-mass-unit",1)
6.022136652e+26
>>> weight_conversion("gram","kilogram",1)
0.001
>>> weight_conversion("gram","gram",3)
3.0
>>> weight_conversion("gram","milligram",2)
2000.0
>>> weight_conversion("gram","metric-ton",4)
4e-06
>>> weight_conversion("gram","long-ton",3)
2.9526219e-06
>>> weight_conversion("gram","short-ton",3)
3.3069366000000003e-06
>>> weight_conversion("gram","pound",3)
0.0066138732606
>>> weight_conversion("gram","stone",4)
0.0006298926912000001
>>> weight_conversion("gram","ounce",1)
0.035273990723
>>> weight_conversion("gram","carrat",2)
10.0
>>> weight_conversion("gram","atomic-mass-unit",1)
6.022136652e+23
>>> weight_conversion("milligram","kilogram",1)
1e-06
>>> weight_conversion("milligram","gram",2)
0.002
>>> weight_conversion("milligram","milligram",3)
3.0
>>> weight_conversion("milligram","metric-ton",3)
3e-09
>>> weight_conversion("milligram","long-ton",3)
2.9526219e-09
>>> weight_conversion("milligram","short-ton",1)
1.1023122e-09
>>> weight_conversion("milligram","pound",3)
6.6138732605999995e-06
>>> weight_conversion("milligram","ounce",2)
7.054798144599999e-05
>>> weight_conversion("milligram","carrat",1)
0.005
>>> weight_conversion("milligram","atomic-mass-unit",1)
6.022136652e+20
>>> weight_conversion("metric-ton","kilogram",2)
2000
>>> weight_conversion("metric-ton","gram",2)
2000000
>>> weight_conversion("metric-ton","milligram",3)
3000000000
>>> weight_conversion("metric-ton","metric-ton",2)
2.0
>>> weight_conversion("metric-ton","long-ton",3)
2.9526219
>>> weight_conversion("metric-ton","short-ton",2)
2.2046244
>>> weight_conversion("metric-ton","pound",3)
6613.8732606
>>> weight_conversion("metric-ton","ounce",4)
141095.96289199998
>>> weight_conversion("metric-ton","carrat",4)
20000000
>>> weight_conversion("metric-ton","atomic-mass-unit",1)
6.022136652e+29
>>> weight_conversion("long-ton","kilogram",4)
4064.18432
>>> weight_conversion("long-ton","gram",4)
4064184.32
>>> weight_conversion("long-ton","milligram",3)
3048138240.0
>>> weight_conversion("long-ton","metric-ton",4)
4.06418432
>>> weight_conversion("long-ton","long-ton",3)
2.999999907217152
>>> weight_conversion("long-ton","short-ton",1)
1.119999989746176
>>> weight_conversion("long-ton","pound",3)
6720.000000049448
>>> weight_conversion("long-ton","ounce",1)
35840.000000060514
>>> weight_conversion("long-ton","carrat",4)
20320921.599999998
>>> weight_conversion("long-ton","atomic-mass-unit",4)
2.4475073353955697e+30
>>> weight_conversion("short-ton","kilogram",3)
2721.5519999999997
>>> weight_conversion("short-ton","gram",3)
2721552.0
>>> weight_conversion("short-ton","milligram",1)
907184000.0
>>> weight_conversion("short-ton","metric-ton",4)
3.628736
>>> weight_conversion("short-ton","long-ton",3)
2.6785713457296
>>> weight_conversion("short-ton","short-ton",3)
2.9999999725344
>>> weight_conversion("short-ton","pound",2)
4000.0000000294335
>>> weight_conversion("short-ton","ounce",4)
128000.00000021611
>>> weight_conversion("short-ton","carrat",4)
18143680.0
>>> weight_conversion("short-ton","atomic-mass-unit",1)
5.463186016507968e+29
>>> weight_conversion("pound","kilogram",4)
1.814368
>>> weight_conversion("pound","gram",2)
907.184
>>> weight_conversion("pound","milligram",3)
1360776.0
>>> weight_conversion("pound","metric-ton",3)
0.001360776
>>> weight_conversion("pound","long-ton",2)
0.0008928571152432
>>> weight_conversion("pound","short-ton",1)
0.0004999999954224
>>> weight_conversion("pound","pound",3)
3.0000000000220752
>>> weight_conversion("pound","ounce",1)
16.000000000027015
>>> weight_conversion("pound","carrat",1)
2267.96
>>> weight_conversion("pound","atomic-mass-unit",4)
1.0926372033015936e+27
>>> weight_conversion("stone","kilogram",5)
31.751450000000002
>>> weight_conversion("stone","gram",2)
12700.58
>>> weight_conversion("stone","milligram",3)
19050870.0
>>> weight_conversion("stone","metric-ton",3)
0.01905087
>>> weight_conversion("stone","long-ton",3)
0.018750005325351003
>>> weight_conversion("stone","short-ton",3)
0.021000006421614002
>>> weight_conversion("stone","pound",2)
28.00000881870372
>>> weight_conversion("stone","ounce",1)
224.00007054835967
>>> weight_conversion("stone","carrat",2)
63502.9
>>> weight_conversion("ounce","kilogram",3)
0.0850485
>>> weight_conversion("ounce","gram",3)
85.0485
>>> weight_conversion("ounce","milligram",4)
113398.0
>>> weight_conversion("ounce","metric-ton",4)
0.000113398
>>> weight_conversion("ounce","long-ton",4)
0.0001116071394054
>>> weight_conversion("ounce","short-ton",4)
0.0001249999988556
>>> weight_conversion("ounce","pound",1)
0.0625000000004599
>>> weight_conversion("ounce","ounce",2)
2.000000000003377
>>> weight_conversion("ounce","carrat",1)
141.7475
>>> weight_conversion("ounce","atomic-mass-unit",1)
1.70724563015874e+25
>>> weight_conversion("carrat","kilogram",1)
0.0002
>>> weight_conversion("carrat","gram",4)
0.8
>>> weight_conversion("carrat","milligram",2)
400.0
>>> weight_conversion("carrat","metric-ton",2)
4.0000000000000003e-07
>>> weight_conversion("carrat","long-ton",3)
5.9052438e-07
>>> weight_conversion("carrat","short-ton",4)
8.818497600000002e-07
>>> weight_conversion("carrat","pound",1)
0.00044092488404000004
>>> weight_conversion("carrat","ounce",2)
0.0141095962892
>>> weight_conversion("carrat","carrat",4)
4.0
>>> weight_conversion("carrat","atomic-mass-unit",4)
4.8177093216e+23
>>> weight_conversion("atomic-mass-unit","kilogram",4)
6.642160796e-27
>>> weight_conversion("atomic-mass-unit","gram",2)
3.321080398e-24
>>> weight_conversion("atomic-mass-unit","milligram",2)
3.3210803980000002e-21
>>> weight_conversion("atomic-mass-unit","metric-ton",3)
4.9816205970000004e-30
>>> weight_conversion("atomic-mass-unit","long-ton",3)
4.9029473573977584e-30
>>> weight_conversion("atomic-mass-unit","short-ton",1)
1.830433719948128e-30
>>> weight_conversion("atomic-mass-unit","pound",3)
1.0982602420317504e-26
>>> weight_conversion("atomic-mass-unit","ounce",2)
1.1714775914938915e-25
>>> weight_conversion("atomic-mass-unit","carrat",2)
1.660540199e-23
>>> weight_conversion("atomic-mass-unit","atomic-mass-unit",2)
1.999999998903455
"""
if to_type not in KILOGRAM_CHART or from_type not in WEIGHT_TYPE_CHART:
raise ValueError(
f"Invalid 'from_type' or 'to_type' value: {from_type!r}, {to_type!r}\n"
f"Supported values are: {', '.join(WEIGHT_TYPE_CHART)}"
)
return value * KILOGRAM_CHART[to_type] * WEIGHT_TYPE_CHART[from_type]
if __name__ == "__main__":
import doctest
doctest.testmod()
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