python programming

Calcdoc.py: a tkinter app to memorize operations

You may think that a calculator is not so important today that we have it on every mobile, you can use spreadsheets etc. We are in a world dominated by computers and mobile phone full of apps… but I think it could always be interesting to have a calculator and a text editor… together. I don’t know if there are other apps like this, but I don’t know any, so I thought that could be a nice thing to add some features to my lastes minicalculator app. This app followed this progression:

I think that this option is cool and not so obvious. You ca use a notepad, you can use a calculator, but I do not have an app that makes me do memorize the operation and write notes around them at the same time. I think to a possible use of it while I am doing things on the fly and I want to be able to go back to the note to see what those operations were about. This is the code, followed by the video that explains how I changed the previous code (second item of the list of the progress above) to the new one. Have fun coding!

import tkinter as tk
import os


# This class inherit from Frame
class App(tk.Frame):
    def __init__(self):
        tk.Frame.__init__(self)
        self.option_add("*Font", "arial 20 bold")
        self.pack(expand=tk.YES, fill=tk.BOTH)
        self.master.title("Calculator")
        self.master.tk.call('wm', 'iconphoto', self.master._w, tk.PhotoImage(file='calculator.png'))
        # the widgets: display, clear button...
        self._display()
        self.list_of_ops()

    def _display(self):
        display = tk.StringVar()
        entry = tk.Entry(
            self,
            relief=tk.FLAT,
            textvariable=display,
            justify='right',
            bd=15,
            bg='orange')
        entry.pack(side=tk.TOP)
        entry.focus()
        entry.bind("<Return>", lambda x: self.calc(display))
        entry.bind("<Escape>", lambda x: display.set(""))
        self.master.bind("<Control-s>", self.save)

    def save(self, event):
        "Save the memo about the operations"
        with open("memo.txt", "w", encoding="utf-8") as file:
            file.write(self.text.get("0.0", tk.END))
        os.startfile("memo.txt")

    def list_of_ops(self):
        self.text = tk.Text(self, height=10, width=30)
        self.text.pack(fill="both", expand=1)


    def calc(self, display):
        try:
            ris = eval(display.get())
            if str(display.get()) == str(ris):
                display.set("")
            else:
                self.text.insert(tk.END, display.get() + "=" + str(ris) + "\n")
                display.set(ris)
        except NameError as e:
            display.set("ERR: press ESC")


if __name__ == '__main__':
    a = App()
    a.mainloop()

Live coding video calculator app

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