Question

Write a Python application that allows the user to convert between temperatures in Fahrenheit and temperatures in Celsius. Below are the formulas for both, where Tc is temperature in Celsius and Tf is temperature in Fahrenheit: There should be 3 separate py files/classes- the Model, the View, and the Controllers. The Model contains the F/C conversion. The View is the frame. The controller runs the program and communicates between the Controller and Model

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

Note: Make sure the below files are saved as model.py, view.py and controller.py

#code

#model.py file containing Model class

class Model:
    #method that converts temperature in celsius to fahrenheit
    def convertToFahrenheit(self, celsius):
        return (celsius*(9/5))+32

    # method that converts temperature in fahrenheit to celsius
    def convertToCelsius(self, fahrenheit):
        return (fahrenheit-32)*(5/9)

#view.py file containing View class



from tkinter import *


#View class is extended from Frame class of tkinter

class View(Frame):
    #constructor
    def __init__(self, root=None):
        #invoking super class constructor
        super(View, self).__init__(root)
        #setting up StringVar and IntVar variables for accessing/mutating values of UI components
        self.inputText = StringVar()
        self.outputText = StringVar()
        self.radioChoice = IntVar()
        #creating required labels entries and radio buttons
        Label(self, text='Input Temperature: ').grid(row=0, column=0)
        #note that inputText StringVar is linked with below entry, so the contents of below
        #Entry object can be accessed by calling inputText.get() and can be mutated by calling
        #inputText.set(...). the same applies to other variables
        Entry(self, textvariable=self.inputText).grid(row=0, column=1,columnspan=2,sticky='ew')
        Label(self,text='Source: ').grid(row=1,column=0)
        Radiobutton(self,text='Celsius',variable=self.radioChoice,value=1).grid(row=1,column=1)
        Radiobutton(self, text='Fahrenheit', variable=self.radioChoice, value=2).grid(row=1, column=2)
        Label(self, text='Output Temperature: ').grid(row=2, column=0)
        Label(self, textvariable=self.outputText).grid(row=2, column=1,columnspan=2,sticky='ew')
        #selecting value 1 for radio choice, which will select celsius as default source temperature
        self.radioChoice.set(1)



    #returns the input temperature converted to float
    def getInputTemperature(self):
        return float(self.inputText.get())



    #updates the output label with the text provided
    def setOutput(self, output):
        self.outputText.set(output)



    #returns True if celsius is selected as the current source temperature
    def isCelsiusSelected(self):
        return self.radioChoice.get()==1

#controller.py containing Controller class


import model,viewimport tkinter

class Controller:
    #constructor initializing GUI
    def __init__(self):
        #creating a model
        self._model = model.Model()
        #creating a root window
        root = tkinter.Tk()
        #creating a view
        self._view = view.View(root)
        #adding view to the gui
        self._view.pack()
        #creating a convert button, that calls convert() method
        b=tkinter.Button(root,text='Convert',command=self.convert).pack()
        #staying until user clicks close button
        root.mainloop()


    #method to perform conversion
    def convert(self):
        try:
            #getting input temperature
            tempSource=self._view.getInputTemperature()
            #getting the source temperature type
            if self._view.isCelsiusSelected():
                #celsius is selected, converting to fahrenheit
                tempDest=self._model.convertToFahrenheit(tempSource)
                #displaying output with temperature rounded to 2 decimal places
                self._view.setOutput('{:.2f}F'.format(tempDest))
            else:
                #converting to celsius
                tempDest = self._model.convertToCelsius(tempSource)
                self._view.setOutput('{:.2f}C'.format(tempDest))
        except:
            #invalid input entered
            self._view.setOutput('Invalid input!')


#initializing GUI, binding view and model
c=Controller()

#output

tk Input Temperature: 123 CelsiusFahrenheit Source: Output Temperature: 253.40F Convert X