Metric Calculator in Tkinter

Question

Regan_1 0 Newbie Poster

8 Years Ago

I am quite new to python programming and having trouble with this program. This is what my GUI looks like Click Here . What I am trying to acomplish is by have the two comboboxes select the units and then calculate them.
Code:

self.measurements = StringVar()
        self.Combobox_Length_Left = ttk.Combobox(self.length_frame, textvariable = self.measurements, values = ('mm', 'cm', 'inches', 'feet', 'yards', 'meter', 'km', 'miles'), width = 10)
        self.Combobox_Length_Left.grid(row = 2, column = 0, padx = 5, pady = 5, sticky = E)

        self.measurements1 = StringVar()
        self.Combobox_Length_Right = ttk.Combobox(self.length_frame, textvariable = self.measurements1, value = ('mm', 'cm', 'inches', 'feet', 'yards', 'meter', 'km', 'miles'), width = 10)
        self.Combobox_Length_Right.grid(row = 2, column = 2, padx = 5, pady = 5, sticky = E)

        #Labels
        self.Convertion = Label(self.length_frame, text = 'Convertion:')
        self.Convertion.grid(row = 1, column = 0, padx = 5, pady = 5, sticky = W)

        self.Label_Blank = Label(self.length_frame, text = '')
        self.Label_Blank.grid(row = 1, column = 1, padx = 5, pady = 5, sticky = E)

        self.Label_To2 = Label(self.length_frame, text = 'to')
        self.Label_To2.grid(row = 2, column = 1, padx = 5, pady = 5, sticky = E)

        self.Label_To = Label(self.length_frame, text = 'to')
        self.Label_To.grid(row = 3, column = 1, padx = 5, pady = 5, sticky = E)

        #Entry Boxes
        self.Text_Length_Left = StringVar()
        self.Entry_Length_Left = ttk.Entry(self.length_frame, textvariable = self.Text_Length_Left,width = 13)
        self.Entry_Length_Left.grid(row = 3, column = 0, padx = 5, pady = 5)

        self.Text_Length_Right = StringVar()
        self.Entry_Length_Right = ttk.Entry(self.length_frame, textvariable = self.Text_Length_Right,width = 13)
        self.Entry_Length_Right.grid(row = 3, column = 2, padx = 5, pady = 5)

I just need someone to help me with the calculations/ programming

Thanks!

python

Edited 8 Years Ago by Regan_1

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Latest Post 8 Years Ago Latest Post by Regan_1

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Gribouillis 1,391 Programming Explorer

8 Years Ago

According to the python documentation

The combobox widget generates a <<ComboboxSelected>> virtual event when the user selects an element from the list of values.

It means that you could bind this event to one of your methods

mywidget.bind('<<ComboboxSelected>>', self.mymethod)

Then define a method

def mymethod(self, *args):
    print(args)

and see if something happens.

Edited 8 Years Ago by Gribouillis

Gribouillis 1,391 Programming Explorer

8 Years Ago

Can you post the whole code ?

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Regan_1 0 Newbie Poster · Answer 1 · 2016-04-15T02:44:57+00:00

I tried this it isnt what I am looking for I am trying to do this using a dictionary array and using the lambda function to get the selected 2 combo boxes and displayu the calculations and calculate the units.

Regan_1 0 Newbie Poster · Answer 2 · 2016-04-15T06:58:56+00:00

Here is the link to download the code or here is the code in text: http://www.mediafire.com/download/jkaop1omhh7jdef/Notebook_method.py

from tkinter import *
from tkinter import ttk

class Convertion:
    def Fahrenheit_convert(self):
        words = self.Text_Fahrenheit.get()
        try:
            Fahrenheit_temp = float(words)
        except (ValueError, TypeError):
            self.Entry_Celsius.delete(0, END)
            self.Entry_Kelvin.delete(0, END)
            return
        self.Entry_Celsius.delete(0, END)
        self.Entry_Celsius.insert(0, '%.2f' % (self.Fahrenheit_to_Celsius(Fahrenheit_temp)))
        self.Entry_Kelvin.delete(0, END)
        self.Entry_Kelvin.insert(0, '%.2f' % (self.Celsius_to_Kelvin(self.Fahrenheit_to_Celsius(Fahrenheit_temp))))
        return
    def Celsius_convert(self):
        words = self.Text_Celsius.get()
        try:
            Celsius_temp = float(words)
        except (ValueError, TypeError):
            self.Entry_Fahrenheit.delete(0, END)
            self.Entry_Fahrenheit.delete(0, END)
            return
        self.Entry_Fahrenheit.delete(0, END)
        self.Entry_Kelvin.insert(0, '%.2f' % (self.Celsius_to_Fahrenheit(Celsius_temp)))
        self.Entry_Kelvin.delete(0, END)
        self.Entry_Kelvin.insert(0, '%.2f' % (self.Celsius_to_Kelvin(Celsius_temp)))

    def Kelvin_convert(self):
        words = self.Text_Kelvin.get()
        try:
            Kelvin_temp = float(words)
        except (ValueError, TypeError):
            self.Entry_Fahrenheit.delete(0, END)
            self.Entry_Celsius.delete(0, END)
            return
        self.Entry_Fahrenheit.delete(0, END)
        self.Entry_Fahrenheit.insert(0, '%.2f' % (self.Celsius_to_Fahrenheit(self.Kelvin_to_Celsius(Kelvin_temp))))
        self.Entry_Celsius.delete(0, END)
        self.Entry_Celsius.insert(0, '%.2f' % (self.Kelvin_to_Celsius(Kelvin_temp)))

    # conversion math
    def Fahrenheit_to_Celsius(self, temp):
        return (temp - 32) * 5 / 9

    def Celsius_to_Fahrenheit(self, temp):
        return temp * 9 / 5 + 32

    def Celsius_to_Kelvin(self, temp):
        return temp + 273.15

    def Kelvin_to_Celsius(self, temp):
        return temp - 273.15
#=========================Length Calculations=======================#



#============================GUI Class=============================#
class GUI(Convertion):
    def __init__(self,root):
        self.notebook = ttk.Notebook(root)
        self.notebook.pack()

        self.length_frame = ttk.Frame(self.notebook)
        self.weight_frame = ttk.Frame(self.notebook)
        self.temperature_frame = ttk.Frame(self.notebook)
#=======================Length Frame===============================#
        self.notebook.add(self.length_frame, text = 'Length')

        #Combobox
        self.measurements = StringVar()
        self.Combobox_Length_Left = ttk.Combobox(self.length_frame, textvariable = self.measurements, values = ('mm', 'cm', 'inches', 'feet', 'yards', 'meter', 'km', 'miles'), width = 10)
        self.Combobox_Length_Left.grid(row = 2, column = 0, padx = 5, pady = 5, sticky = E)

        self.measurements1 = StringVar()
        self.Combobox_Length_Right = ttk.Combobox(self.length_frame, textvariable = self.measurements1, value = ('mm', 'cm', 'inches', 'feet', 'yards', 'meter', 'km', 'miles'), width = 10)
        self.Combobox_Length_Right.grid(row = 2, column = 2, padx = 5, pady = 5, sticky = E)

        #Labels
        self.Convertion = Label(self.length_frame, text = 'Convertion:')
        self.Convertion.grid(row = 1, column = 0, padx = 5, pady = 5, sticky = W)

        self.Label_Blank = Label(self.length_frame, text = '')
        self.Label_Blank.grid(row = 1, column = 1, padx = 5, pady = 5, sticky = E)

        self.Label_To2 = Label(self.length_frame, text = 'to')
        self.Label_To2.grid(row = 2, column = 1, padx = 5, pady = 5, sticky = E)

        self.Label_To = Label(self.length_frame, text = 'to')
        self.Label_To.grid(row = 3, column = 1, padx = 5, pady = 5, sticky = E)

        #Entry Boxes
        self.Text_Length_Left = StringVar()
        self.Entry_Length_Left = ttk.Entry(self.length_frame, textvariable = self.Text_Length_Left,width = 13)
        self.Entry_Length_Left.grid(row = 3, column = 0, padx = 5, pady = 5)

        self.Text_Length_Right = StringVar()
        self.Entry_Length_Right = ttk.Entry(self.length_frame, textvariable = self.Text_Length_Right,width = 13)
        self.Entry_Length_Right.grid(row = 3, column = 2, padx = 5, pady = 5)




#========================Weight Frame=============================#
        self.notebook.add(self.weight_frame, text = 'Weight')

        #Combobox
        self.measurements_weight = StringVar()
        self.Combobox_Weight_Left = ttk.Combobox(self.weight_frame, textvariable = self.measurements_weight, values = ('oz', 'g', 'kg', 'lb', 't', 'mt'), width = 10)
        self.Combobox_Weight_Left.grid(row = 2, column = 0, padx = 5, pady = 5, sticky = E)

        self.measurements_weight1 = StringVar()
        self.Combobox_Weight_Right = ttk.Combobox(self.weight_frame, textvariable = self.measurements_weight1, values = ('oz', 'g', 'kg', 'lb', 't', 'mt'), width = 10)
        self.Combobox_Weight_Right.grid(row = 2, column = 2, padx = 5, pady = 5, sticky = E)

        #Labels
        self.Convertion = Label(self.weight_frame, text = 'Convertion:')
        self.Convertion.grid(row = 1, column = 0, padx = 5, pady = 5, sticky = W)

        self.Label_Blank = Label(self.weight_frame, text = '')
        self.Label_Blank.grid(row = 1, column = 1, padx = 5, pady = 5, sticky = E)

        self.Label_To2 = Label(self.weight_frame, text = 'to')
        self.Label_To2.grid(row = 2, column = 1, padx = 5, pady = 5, sticky = E)

        self.Label_To = Label(self.weight_frame, text = 'to')
        self.Label_To.grid(row = 3, column = 1, padx = 5, pady = 5, sticky = E)

        #Entry Boxes

        self.Text_Weight_Left = StringVar()
        self.Text_Weight_Left.set('')
        self.Entry_Weight_Left = ttk.Entry(self.weight_frame, textvariable = self.Text_Weight_Left,width = 13)
        self.Entry_Weight_Left.grid(row = 3, column = 0, padx = 5, pady = 5)

        self.Text_Weight_Right = StringVar()
        self.Text_Weight_Right.set('')
        self.Entry_Weight_Right = ttk.Entry(self.weight_frame, textvariable = self.Text_Weight_Right,width = 13)
        self.Entry_Weight_Right.grid(row = 3, column = 2, padx = 5, pady = 5)

#======================Temperature Frame =========================#

        self.notebook.add(self.temperature_frame, text = 'Temperature')

        # scale names
        self.Label_Fahrenheit = Label(self.temperature_frame, text = 'Fahrenheit:')
        self.Label_Fahrenheit.grid(row = 1, column = 0, padx = 5, pady = 5, sticky = E)

        self.Label_Celsius = Label(self.temperature_frame, text = 'Celsius:')
        self.Label_Celsius.grid(row = 2, column = 0, padx = 5, pady = 5, sticky = E)

        self.Label_Kelvin = Label(self.temperature_frame, text = 'Kelvin:')
        self.Label_Kelvin.grid(row = 3, column = 0, padx = 5, pady = 5, sticky = E)

        # entry boxes
        self.Text_Fahrenheit = StringVar()
        self.Text_Fahrenheit.set('')
        self.Entry_Fahrenheit = ttk.Entry(self.temperature_frame, textvariable = self.Text_Fahrenheit,width = 10)
        self.Entry_Fahrenheit.grid(row = 1, column = 1, padx = 5, pady = 5)

        self.Text_Celsius = StringVar()
        self.Text_Celsius.set('')
        self.Entry_Celsius = ttk.Entry(self.temperature_frame, textvariable = self.Text_Celsius, width = 10)
        self.Entry_Celsius.grid(row = 2, column = 1, padx = 5, pady = 5)

        self.Text_Kelvin = StringVar()
        self.Text_Kelvin.set('')
        self.Entry_Kelvin = ttk.Entry(self.temperature_frame, textvariable = self.Text_Kelvin, width = 10)
        self.Entry_Kelvin.grid(row = 3, column = 1, padx = 5, pady = 5)

        #buttons
        self.Button_Fahrenheit = ttk.Button(self.temperature_frame, text = 'Go', command = self.Fahrenheit_convert)
        self.Button_Fahrenheit.grid(row = 1, column = 2, padx = 5, pady = 5, sticky = N+S+E+W)

        self.Button_Celsius = ttk.Button(self.temperature_frame, text = 'Go', command = self.Celsius_convert)
        self.Button_Celsius.grid(row = 2, column = 2, padx = 5, pady = 5, sticky = N+S+E+W)

        self.Button_Kelvin = ttk.Button(self.temperature_frame, text = 'Go', command = self.Kelvin_convert)
        self.Button_Kelvin.grid(row = 3, column = 2, padx = 5, pady = 5, sticky = N+S+E+W)





def main():
    root = Tk()
    app = GUI(root)
    root.title('Metric Calculator')
    root.resizable(False,False)
    root.mainloop()

main()

Gribouillis 1,391 Programming Explorer Team Colleague · Answer 3 · 2016-04-15T12:35:39+00:00

What you can do is add a dictionary

        self.as_meter = dict(
            mm=0.001, cm=0.01, inches=0.0254,
            feet=0.3048, yards=0.9144, meter=1.0,
            km=1000.0, miles=1609.344,
        )

Then you add lines to bind various variables

        self.measurements.trace('w', self.update_length)
        self.measurements1.trace('w', self.update_length)
        self.Text_Length_Left.trace('w', self.update_length)

You need to add a callback method

    def update_length(self, *args):
        try:
            v = float(self.Text_Length_Left.get())
        except ValueError:
            v = 0.0
            self.Text_Length_Left.set(str(v))
        m = v * self.as_meter [self.measurements.get()]
        r = m/self.as_meter[self.measurements1.get()]
        self.Text_Length_Right.set("{:.3e}".format(r))

You can also set a parameter state='readonly' for Entry_Length_Right and you must set the initial values for Combobox_Length_... before you call grid()

        self.Combobox_Length_Left.current(5)
        self.Combobox_Length_Right.current(5)

Regan_1 0 Newbie Poster · Answer 4 · 2016-04-15T23:01:32+00:00

Can you send me your program of this so I can see how you did it? Thanks for the help by the way, means alot.

Gribouillis 1,391 Programming Explorer Team Colleague · Answer 5 · 2016-04-16T06:55:37+00:00

Gribouillis 1,391 Programming Explorer

8 Years Ago

Ok, here it is.

This attachment is potentially unsafe to open. It may be an executable that is capable of making changes to your file system, or it may require specific software to open. Use caution and only open this attachment if you are comfortable working with zip files.

Notebookmethod.py_.zip (1.79 KB)

Regan_1 0 Newbie Poster · Answer 6 · 2016-04-16T06:58:23+00:00

Regan_1 0 Newbie Poster

8 Years Ago

Thanks for help man you gave me the asnwer!

Metric Calculator in Tkinter

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