I am a newbie on programming world and I am trying to learn Python as it is the easiest and very strong programming language. I've learnt all basic theories and the programming syntax and then I have solved some problems from urionlinejudge. Now I'am trying to learn GUI Appliations and I am trying to learn Tkinter module of Python.
Previously I posted a Wikipedia search tool GUI application that I made with python and tkinter module of python. I made another GUI which is a Calculator. Let's jump to the codes.
Importing, naming and sizing
import tkinter as tk
win = tk.Tk()
win.title('Calculator')
win.geometry('380x550+200+100')
win.resizable(0,0)
Functions
def enter_number(x):
last_char = entry_box.get()[-1]
if entry_box.get() == '0' or entry_box.get() == 'Syntax error':
entry_box.delete(0,'end')
entry_box.insert(0,str(x))
elif last_char in ['+', '-','*','/'] and x == '0':
pass
else:
length = len(entry_box.get())
entry_box.insert(length,str(x))
def func_dot(x):
content = entry_box.get()
length = len(content)
if entry_box.get() == '0':
if x == '.':
entry_box.insert(1,'.')
else:
entry_box.insert(length,'.')
def enter_operators(x):
if entry_box.get() != '0':
length = len(entry_box.get())
content = entry_box.get()
last_char = content[-1]
if last_char in ['+','-','/'] or content[-2:] == '**':
pass
else:
entry_box.insert(length, operators_list[x]['text'])
def fun_clr():
entry_box.delete(0,'end')
entry_box.insert(0,'0')
result = 0
history = []
def func_equal():
content = entry_box.get()
try:
result=eval(content)
entry_box.delete(0,'end')
entry_box.insert(0,str(result))
history.append(content)
history.reverse()
status.configure(text='History: '+ ' | '.join(history[0:7]), font='verdana 7 bold')
except:
entry_box.delete(0,'end')
entry_box.insert(0,'Syntax error')
def func_del():
if entry_box.get() == 'Syntax error':
entry_box.delete(0, 'end')
entry_box.insert(0, '0')
if entry_box.get() !='0':
length = len(entry_box.get())
entry_box.delete(length-1, 'end')
if length == 1:
entry_box.insert(0,'0')
Entry Box
entry_box = tk.Entry(font='verdana 14 bold', width=22, bd=6, justify=tk.RIGHT)
entry_box.insert(0,'0')
entry_box.pack(padx=10, pady=10)
btn_list = []
for i in range(10):
btn_list.append(tk.Button(text=str(i), bd=6,font='verdana 14 bold', width=4, command = lambda x=i:enter_number(x)))
btn_numbers=1
for i in range(3):
for j in range(3):
btn_list[btn_numbers].place(x=30+j*90, y=70+i*70)
btn_numbers+=1
operators button
operators_list = []
for i in range(4):
operators_list.append(tk.Button(width=4, font='verdana 14 bold', bd=5, command = lambda x=i: enter_operators(x)))
operators_list[0]['text'] = '+'
operators_list[1]['text'] = '-'
operators_list[2]['text'] = '*'
operators_list[3]['text'] = '/'
for i in range(4):
operators_list[i].place(x=290, y=70+i*70)
Other buttons
# *************** zero btn *************
zero_btn = tk.Button(text='0',width=11, font='verdana 14 bold', bd=5, command = lambda x='0': enter_number(x))
zero_btn.place(x=30, y=280)
# ************ clr btn **********
clr_btn = tk.Button(text='C',width=11, font='verdana 14 bold', bd=5, command = fun_clr)
clr_btn.place(x=30, y=350)
# *************** dot btn **************
btn_dot = tk.Button(text='.',width=4, font='verdana 14 bold', bd=5, command = lambda x='.': func_dot(x))
btn_dot.place(x=210, y=280)
# *************** del btn **************
btn_del = tk.Button(text='Del',width=10, font='verdana 14 bold', bd=5, command = func_del)
btn_del.place(x=210, y=350)
# ************************** equal btn ****************
btn_equal = tk.Button(text='=',width=24, font='verdana 14 bold', bd=5, command = func_equal)
btn_equal.place(x=30, y=420)
status bar
# ****************** status bar *************
status = tk.Label(win, text='History ', font='verdana 7 bold')
status.place(x=30,y=490)
copyright message
# *************** copyright message *************
message = tk.Label(text='©All rights reserved',font='verdana 7')
message.pack(side=tk.BOTTOM, fill=tk.Y)
win.mainloop()
So the full code is :-
import tkinter as tk
win = tk.Tk()
win.title('Calculator')
win.geometry('380x550+200+100')
win.resizable(0,0)
def enter_number(x):
last_char = entry_box.get()[-1]
if entry_box.get() == '0' or entry_box.get() == 'Syntax error':
entry_box.delete(0,'end')
entry_box.insert(0,str(x))
elif last_char in ['+', '-','*','/'] and x == '0':
pass
else:
length = len(entry_box.get())
entry_box.insert(length,str(x))
def func_dot(x):
content = entry_box.get()
length = len(content)
if entry_box.get() == '0':
if x == '.':
entry_box.insert(1,'.')
else:
entry_box.insert(length,'.')
def enter_operators(x):
if entry_box.get() != '0':
length = len(entry_box.get())
content = entry_box.get()
last_char = content[-1]
if last_char in ['+','-','/'] or content[-2:] == '**':
pass
else:
entry_box.insert(length, operators_list[x]['text'])
def fun_clr():
entry_box.delete(0,'end')
entry_box.insert(0,'0')
result = 0
history = []
def func_equal():
content = entry_box.get()
try:
result=eval(content)
entry_box.delete(0,'end')
entry_box.insert(0,str(result))
history.append(content)
history.reverse()
status.configure(text='History: '+ ' | '.join(history[0:7]), font='verdana 7 bold')
except:
entry_box.delete(0,'end')
entry_box.insert(0,'Syntax error')
def func_del():
if entry_box.get() == 'Syntax error':
entry_box.delete(0, 'end')
entry_box.insert(0, '0')
if entry_box.get() !='0':
length = len(entry_box.get())
entry_box.delete(length-1, 'end')
if length == 1:
entry_box.insert(0,'0')
entry_box = tk.Entry(font='verdana 14 bold', width=22, bd=6, justify=tk.RIGHT)
entry_box.insert(0,'0')
entry_box.pack(padx=10, pady=10)
btn_list = []
for i in range(10):
btn_list.append(tk.Button(text=str(i), bd=6,font='verdana 14 bold', width=4, command = lambda x=i:enter_number(x)))
btn_numbers=1
for i in range(3):
for j in range(3):
btn_list[btn_numbers].place(x=30+j*90, y=70+i*70)
btn_numbers+=1
operators_list = []
for i in range(4):
operators_list.append(tk.Button(width=4, font='verdana 14 bold', bd=5, command = lambda x=i: enter_operators(x)))
operators_list[0]['text'] = '+'
operators_list[1]['text'] = '-'
operators_list[2]['text'] = '*'
operators_list[3]['text'] = '/'
for i in range(4):
operators_list[i].place(x=290, y=70+i*70)
zero_btn = tk.Button(text='0',width=11, font='verdana 14 bold', bd=5, command = lambda x='0': enter_number(x))
zero_btn.place(x=30, y=280)
clr_btn = tk.Button(text='C',width=11, font='verdana 14 bold', bd=5, command = fun_clr)
clr_btn.place(x=30, y=350)
btn_dot = tk.Button(text='.',width=4, font='verdana 14 bold', bd=5, command = lambda x='.': func_dot(x))
btn_dot.place(x=210, y=280)
btn_del = tk.Button(text='Del',width=10, font='verdana 14 bold', bd=5, command = func_del)
btn_del.place(x=210, y=350)
btn_equal = tk.Button(text='=',width=24, font='verdana 14 bold', bd=5, command = func_equal)
btn_equal.place(x=30, y=420)
status = tk.Label(win, text='History ', font='verdana 7 bold')
status.place(x=30,y=490)
message = tk.Label(text='©All rights reserved',font='verdana 7')
message.pack(side=tk.BOTTOM, fill=tk.Y)
win.mainloop()
Output
