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
![image.png](https://images.hive.blog/DQmTJiQNwd4x3mshF6vDFeEg1edBpyGBEVaumeZdertjaUK/image.png)
``` 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
![image.png](https://images.hive.blog/DQmd5tdNScMyaUccp9DbGLJifmoNPNJqtJ3XZwdrnfDwqnY/image.png)
``` 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
![image.png](https://images.hive.blog/DQmeuXvbBefPWg4pMaz9zcPZhvkp33TbBPPxpfzHTmoioB6/image.png)
``` 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
![image.png](https://images.hive.blog/DQmR5M58C3qcrFJysffqNXRZMvCo7XWqNS9zRReFpBhnwVw/image.png)
``` # *************** 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
![image.png](https://images.hive.blog/DQmNvuakDFQySeBB2K1LoBz1gePVFLj5sKJqFKVbF4bLyde/image.png)
``` # ****************** status bar ************* status = tk.Label(win, text='History ', font='verdana 7 bold') status.place(x=30,y=490) ```
#### copyright message
![image.png](https://images.hive.blog/DQmYAFSnJWiYd6EBAHiRJqiv359ZWvLZfLDMxhjvZrMouSy/image.png)
``` # *************** 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 https://youtu.be/3dc3FqA-DAo

## Thank You

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