{"id":1383,"date":"2018-11-04T18:27:50","date_gmt":"2018-11-04T17:27:50","guid":{"rendered":"http:\/\/pythonprogramming.altervista.org\/?p=1383"},"modified":"2019-03-24T16:33:03","modified_gmt":"2019-03-24T15:33:03","slug":"a-simple-calculator-with-tkinter","status":"publish","type":"post","link":"https:\/\/pythonprogramming.altervista.org\/a-simple-calculator-with-tkinter\/","title":{"rendered":"Mini – calculator with Python and tkinter"},"content":{"rendered":"

Calculator… not just like you imagine it<\/h1>\n

\"\"<\/a><\/p>\n

I want to show a simple use of tkinter, very simple, but with a practical example that can be useful for many simple tasks, that you can make more complex for your purposes.<\/p>\n

The code for the calculator<\/h2>\n

\"Gears<\/p>\n

Here is the code, no buttons as you can use the keyboard to do all the things you need.<\/p>\n

from tkinter import *\r\n\r\n#This function returns a Frame\r\ndef iCalc(source, side):\r\n    \"Returns a Frame object yet packed and expanded, to shorten the code\"\r\n    # the bd is the border of the frame\r\n    storeObj = Frame(source, borderwidth=10, bd=1, bg=\"gray\")\r\n    # the pack methos is needed to diplay the object\r\n    storeObj.pack(side=side, expand=YES, fill=BOTH)\r\n    return storeObj\r\n\r\n# This class inherit from Frame\r\nclass App(Frame):\r\n    def __init__(self):\r\n        Frame.__init__(self)\r\n        self.option_add(\"*Font\", \"arial 20 bold\")\r\n        self.pack(expand=YES, fill=BOTH)\r\n        self.master.title(\"MiniCalculator\")\r\n\r\n\r\n        #  THE DISPLAY\r\n        display = StringVar()\r\n        # relief can be FLAT or RIDGE or RAISED or SUNKEN GROOVE\r\n        entry = Entry(self, relief=FLAT, textvariable=display, justify='right', bd=15, bg='orange')\r\n        entry.pack(side=TOP)\r\n        # I added an action to calculate the operation when Return (Enter) is hit\r\n        entry.focus()\r\n        # You can hit enter to get the result instead of clicking =\r\n        self.master.bind(\"<Return>\", lambda e, s=self, storeObj=display: s.calc(storeObj))\r\n        # YOu can click del button on the keyboard to cancel\r\n        self.master.bind(\"<Delete>\", lambda e, s=self, storeObj=display: storeObj.set(\"\"))\r\n        self.master.bind(\"<BackSpace>\", lambda e, s=self, storeObj=display: storeObj.set(\"\"))\r\n\r\n\r\n\r\n    def calc(self, display):\r\n        try:\r\n        \t# Sets the display to the evaluation of the string in the display itself, i.e. calculate the result\r\n            display.set(eval(display.get()))\r\n        except:\r\n        \t# if something goes wrong with the result\r\n            display.set(\"ERROR\")\r\n\r\n\r\nif __name__ == '__main__':\r\n    App().mainloop()\r\n<\/pre>\n
Make an exe from the script minicalculator<\/p>\n
Read this article<\/a> to know how to do it, or write this on cmd, after you installed pyinstaller with<\/p>\n
pip install pyinstaller<\/strong><\/p><\/blockquote>\n
pyinstaller --noconsole --onefile --noupx minicalculator.py<\/pre>\n
You will find the exe<\/strong> file in the ‘dist<\/strong>‘ folder that will appear in the folder of the .py file.<\/p>\n
If you double click on the exe<\/strong> file and it does not run<\/strong>, open the cmd<\/strong>\u00a0in that folder and write<\/p>\n
.\\minicalculator<\/pre>\n
You can also try this: right click on the exe file and choose ‘run as administrator<\/strong>‘. The next time you will not need to do this, you can just double click on it.<\/p>\n