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quantities.py
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quantities.py
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import json
class Quantity:
folder = "Quantities"
def __init__(self, quantity_name):
self.name = quantity_name
self.filename = self._get_filename(self.name)
self.file_location = Quantity.folder + "/" + self.filename
self.quantity_dict = self._get_quantity_dict()
self.units = self.quantity_dict["units"].keys()
self.initial_values = [
self.quantity_dict["initial values"]["left value"],
self.quantity_dict["initial values"]["right value"]
]
self.initial_units = [
self.quantity_dict["initial units"]["left unit"],
self.quantity_dict["initial units"]["right unit"]
]
@staticmethod
def _get_filename(quantity_name):
filename = ""
if quantity_name == "Area":
filename = "area.json"
elif quantity_name == "Data Transfer Rate":
filename = "data_transfer_rate.json"
elif quantity_name == "Digital Storage":
filename = "digital_storage.json"
elif quantity_name == "Energy":
filename = "energy.json"
elif quantity_name == "Frequency":
filename = "frequency.json"
elif quantity_name == "Fuel Economy":
filename = "fuel_economy.json"
elif quantity_name == "Length":
filename = "length.json"
# TODO: Kilogram to US ton, when input in right freezes program
elif quantity_name == "Mass":
filename = "mass.json"
elif quantity_name == "Plane Angle":
filename = "plane_angle.json"
elif quantity_name == "Pressure":
filename = "pressure.json"
elif quantity_name == "Speed":
filename = "speed.json"
elif quantity_name == "Temperature":
filename = "temperature.json"
elif quantity_name == "Time":
filename = "time.json"
elif quantity_name == "Volume":
filename = "volume.json"
else:
raise ValueError
return filename
def _get_quantity_dict(self):
with open(self.file_location, "r") as file:
quantity_dict = json.load(file)
return quantity_dict
def convert(self, value, unit, to_unit):
formula = self.quantity_dict["units"][unit]["convert to"][to_unit]["formula"]
# value variable is inside formula text
answer = eval(formula)
return answer
def get_solution_text(self, value, unit, answer, to_unit):
solution_text_format = self.quantity_dict["units"][unit]["convert to"][to_unit]["solution text"]
solution_text = solution_text_format
if "{value}" in solution_text:
solution_text = solution_text.replace("{value}", str(value))
if "{answer}" in solution_text:
solution_text = solution_text.replace("{answer}", str(answer))
return solution_text