Python Calculator from skratch – Part 1 (CalcPy)

Improvising the code to make a calculator from scratch. I made this first part of the code and there is the video of the making. This is the first part, that will allow you to make just sums. I will not use eval, but just regular python operations with variables. Let’s see the code and the video here in the following part of the post.

This is the output, by the way. In the next video the final part.

This calculator makes just additions at the moment

The code of the first part

This code makes only sums…

import tkinter as tk
import tkinter.ttk as ttk

counter = 0
crow = 0
mem1 = 0
def setEntry(value):
    global esv
    global mem1

    v = esv.get()
    v += value
    esv.set(v)

    if value == "+":
        mem1 = v.replace("+", "")
        esv.set("")

    if value == "=":
        mem2 = v.replace("=","")
        mem1 = int(mem1) + int(mem2)
        esv.set(mem1)




def Button(text):
    global counter
    global crow
    global entry
    global esv

    b = ttk.Button(root, text=text)
    root.columnconfigure(counter, weight=1)
    b["command"] = lambda: setEntry(b["text"]) 
    b.grid(row=1+crow, column=counter, sticky="nswe",ipady=10, ipadx=10)
    counter += 1
    if counter > 2:
        crow +=1
        counter = 0
    return b


def main():
    global root
    global esv

    root = tk.Tk()
    root.title("CalpPy")
    esv = tk.StringVar()
    entry = tk.Entry(root, textvariable=esv, justify="right")
    entry["font"] = "arial 24"
    entry["bg"] = "cyan"
    entry.grid(row=0, column=0, columnspan=3, sticky="nswe")

    # Buttons

    for but in [7, 8, 9, 4, 5, 6,
                1, 2, 3, 0, "+", "-",
                "x", ":", "="]:
        b = Button(str(but))

    root.mainloop()

main()