Ok, this is the finale code. In the next post I will show the live coding. Until then, let’s take a look at the code for this calculator app made with python and tkinter.
import tkinter as tk
import tkinter.ttk as ttk
counter = 0
crow = 0
mem1 = ""
mem2 = ""
mop = ""
def setEntry(value):
global esv
global mem1
global mem2
global mop
print(value)
if value == "CE":
esv.set("")
else:
v = esv.get()
v += value
esv.set(v)
# when you press this... you must put the value in mem1
# but you must not add other values
if value in "+-x:":
mop = value
print("mop", mop)
mem1 = v.replace(value, "")
esv.set("")
elif value == "=":
mem2 = v.replace("=","")
print("mem", mop)
if mop == "x":
mop = "*"
if mop == ":":
mop = "/"
result = eval(f"{float(mem1)} {mop} {float(mem2)}")
esv.set(result)
mem1 = result
# Here is when user digit a number
else:
# it is the first number, mem it and show it
if mem1 == "":
mem1 = value
esv.set(value)
# the second number show the first and the second, memorize it
elif mop == "":
value = str(mem1) + value
mem1 = value
esv.set(value)
if mem1 == mem2:
value = str(mem2) + value
mem2 = value
esv.set(value)
def Button(text):
global counter
global crow
global entry
global esv
b = tk.Button(root, text=text)
root.columnconfigure(counter, weight=1)
b["command"] = lambda: setEntry(b["text"])
if b["text"] == "CE":
b["bg"] = "green"
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", ":", "=", "CE"]:
b = Button(str(but))
root.mainloop()
main()
The video with the full code of the calculator app with tkinter
A non resizablem calculator
# custom made buttons for tkinter
import tkinter as tk
from PIL import Image
import base64
import io
from io import BytesIO
def create_image(w,h, color):
"Create an image in the memory"
# create image
img = Image.new("RGB", (w,h), color)
# Saves the new image in memory, not on drive
memfile = BytesIO()
img.save(memfile, format="PNG")
# do not need file argument, as it's an image in the memory
img = tk.PhotoImage(memfile)
def p_print(x):
print(x)
def button(w, h, text, color, command):
# Call to make an image in the memory
img = create_image(w, h, color)
# create button
but = tk.Button(
root,
bd=1,
# relief="groove",
compound=tk.CENTER,
bg=color,
fg="yellow",
activeforeground="gold",
activebackground="blue",
font="arial 20",
text=text,
pady=1,
padx=1,
image=img,
command=command,
width=w
# width=300
)
#but.pack()
return but
counter = 0
crow = 0
mem1 = ""
mem2 = ""
mop = ""
def setEntry(value):
global esv
global mem1
global mem2
global mop
print(value)
if value == "C":
esv.set("")
else:
v = esv.get()
v += value
esv.set(v)
# when you press this... you must put the value in mem1
# but you must not add other values
if value in "+-x:":
mop = value
print("mop", mop)
mem1 = v.replace(value, "")
esv.set("")
elif value == "=":
mem2 = v.replace("=","")
print("mem", mop)
if mop == "x":
mop = "*"
if mop == ":":
mop = "/"
result = eval(f"{float(mem1)} {mop} {float(mem2)}")
esv.set(result)
mem1 = result
# Here is when user digit a number
else:
# it is the first number, mem it and show it
if mem1 == "":
mem1 = value
esv.set(value)
# the second number show the first and the second, memorize it
elif mop == "":
value = str(mem1) + value
mem1 = value
esv.set(value)
if mem1 == mem2:
value = str(mem2) + value
mem2 = value
esv.set(value)
def Button(text):
global counter
global crow
global entry
global esv
# b = button(1, 10, text, "red", None)
b = tk.Button(root, text=text)
b["bg"] = "red"
b["fg"] = "white"
b["font"] = "arial 20"
# root.columnconfigure(counter, weight=1)
# root.rowconfigure(crow, weight=1)
b["command"] = lambda: setEntry(b["text"])
if b["text"] in "-+:x":
b["bg"] = "darkred"
if b["text"] in "C":
b["bg"] = "yellow"
b["fg"] = "green"
if b["text"] == "=":
b["bg"] = "green"
b.grid(row=1+crow, column=counter, columnspan=3, sticky="nswe",ipady=0, ipadx=0)
else:
b.grid(row=1+crow, column=counter, sticky="nswe",ipady=0, ipadx=0)
counter += 1
if counter > 2:
crow +=1
counter = 0
return b
def main():
global root
global esv
root = tk.Tk()
root.title("CalpPy")
root.resizable(False, False)
esv = tk.StringVar()
entry = tk.Entry(root, textvariable=esv, justify="right", width=15)
entry["font"] = "arial 20"
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, "+", "-",
"C", "x", ":", "="]:
b = Button(str(but))
root.mainloop()
main()
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