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"""

Conversion of pressure units.

Available Units:- Pascal,Bar,Kilopascal,Megapascal,psi(pound per square inch),

inHg(in mercury column),torr,atm

USAGE :

-> Import this file into their respective project.

-> Use the function pressure_conversion() for conversion of pressure units.

-> Parameters :

-> value : The number of from units you want to convert

-> from_type : From which type you want to convert

-> to_type : To which type you want to convert

REFERENCES :

-> Wikipedia reference: https://en.wikipedia.org/wiki/Pascal_(unit)

-> Wikipedia reference: https://en.wikipedia.org/wiki/Pound_per_square_inch

-> Wikipedia reference: https://en.wikipedia.org/wiki/Inch_of_mercury

-> Wikipedia reference: https://en.wikipedia.org/wiki/Torr

-> https://en.wikipedia.org/wiki/Standard_atmosphere_(unit)

-> https://msestudent.com/what-are-the-units-of-pressure/

-> https://www.unitconverters.net/pressure-converter.html

"""

from collections import namedtuple

from_to = namedtuple("from_to", "from_ to")

PRESSURE_CONVERSION = {

"atm": from_to(1, 1),

"pascal": from_to(0.0000098, 101325),

"bar": from_to(0.986923, 1.01325),

"kilopascal": from_to(0.00986923, 101.325),

"megapascal": from_to(9.86923, 0.101325),

"psi": from_to(0.068046, 14.6959),

"inHg": from_to(0.0334211, 29.9213),

"torr": from_to(0.00131579, 760),

}

def pressure_conversion(value: float, from_type: str, to_type: str) -> float:

"""

Conversion between pressure units.

>>> pressure_conversion(4, "atm", "pascal")

405300

>>> pressure_conversion(1, "pascal", "psi")

0.00014401981999999998

>>> pressure_conversion(1, "bar", "atm")

0.986923

>>> pressure_conversion(3, "kilopascal", "bar")

0.029999991892499998

>>> pressure_conversion(2, "megapascal", "psi")

290.074434314

>>> pressure_conversion(4, "psi", "torr")

206.85984

>>> pressure_conversion(1, "inHg", "atm")

0.0334211

>>> pressure_conversion(1, "torr", "psi")

0.019336718261000002

>>> pressure_conversion(4, "wrongUnit", "atm")

Traceback (most recent call last):

File "/usr/lib/python3.8/doctest.py", line 1336, in __run

exec(compile(example.source, filename, "single",

File "<doctest __main__.pressure_conversion[8]>", line 1, in <module>

pressure_conversion(4, "wrongUnit", "atm")

File "<string>", line 67, in pressure_conversion

ValueError: Invalid 'from_type' value: 'wrongUnit' Supported values are:

atm, pascal, bar, kilopascal, megapascal, psi, inHg, torr

"""

if from_type not in PRESSURE_CONVERSION:

raise ValueError(

f"Invalid 'from_type' value: {from_type!r} Supported values are:\n"

+ ", ".join(PRESSURE_CONVERSION)

)

if to_type not in PRESSURE_CONVERSION:

raise ValueError(

f"Invalid 'to_type' value: {to_type!r}. Supported values are:\n"

+ ", ".join(PRESSURE_CONVERSION)

)

return (

value * PRESSURE_CONVERSION[from_type].from_ * PRESSURE_CONVERSION[to_type].to

)

if __name__ == "__main__":

import doctest

doctest.testmod()

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