Welcome folks today in this blog post we will be building a mini scientific arithmetic calculator in kivy using python. All the full source code of the application is given below.
Get Started
In order to get started you need to install the following library using the pip command as shown below
pip install kivy
After installing this library you need to make an app.py file and copy paste the following code
app.py
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import kivy import math kivy.require("1.11.1") from kivy.core.window import Window from kivy.app import App from kivy.uix.gridlayout import GridLayout from kivy.uix.button import Button from kivy.lang import Builder from fractions import Fraction class CalcGridLayout(GridLayout): Window.size = (320, 500) def fraction(self, j): if "=" in j: s = j.split("\n=") j = (str(eval(s[1]))) if "." in j: self.display.text = s[0] + "\n=" + str(Fraction(float(j)).limit_denominator(1000)) elif "/" in j: self.display.text = j + "\n=" + str(eval(j)) else: self.display.text = j + "\n=" + str(eval(j)) def sign(self, input): if input: c = [] if "=" in input: c = input.split("\n=") else: c.append(0) c.append(input) try: if c[1][0] == "-": self.display.text = c[1][1:] else: self.display.text = "-" + c[1] except Exception: pass def calculate(self, calculation): g = calculation if calculation: try: if "%" in calculation: c = calculation.split("%") calculation = "/100".join(c) if "\u03C0" in calculation: c = calculation.split("\u03C0") calculation = "(22/7)".join(c) if "^" in calculation: c = calculation.split("^") calculation = "**".join(c) if "\u00B2" in calculation: c = calculation.split("\u00B2") calculation = "**2".join(c) if "=" in calculation: s = calculation.split("\n=") self.display.text = (str(eval(s[1]))) if "=" not in calculation: self.display.text = g + "\n=" + str(eval(calculation)) except Exception: self.display.text = "Error" class CalculatorApp(App): def build(self): return CalcGridLayout() CalcApp = CalculatorApp() CalcApp.run() |
Now you need to make another file called calc.kv inside the root directory and copy paste the following code
calc.kv
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#:import Clock kivy.clock.Clock <Button@Button>: font_size:'25sp' size: 10, 10 padding: 10, 10 ScrollView: do_scroll_x: False do_scroll_y: True <CalcGridLayout>: id:calculator display: entry rows:7 columns:5 padding:3 spacing:1 BoxLayout: TextInput: id: entry size_hint:1,1 halign: 'right' valign: 'bottom' cursor_color:(0,0,1,1) scroll_y: 1 font_size:24 multiline: True BoxLayout: spacing:1 Button: text:"%" on_press:entry.text += self.text Button: text:"^" on_press:entry.text += self.text Button: text:"/" on_press:entry.text+=self.text Button: text:"del" on_press:entry.text = entry.text[:-1] Button: background_color: (0.1, 0.5, 1, 1) text:"AC" on_press:entry.text ="" BoxLayout: spacing:1 Button: text:"(" on_press:entry.text += self.text Button: text:")" on_press:entry.text += self.text Button: text:'x\u00B2' on_press:entry.text+="\u00B2" Button: text : '\u03C0' on_press:entry.text+=self.text Button: text:"sd" on_press:calculator.fraction(entry.text) BoxLayout: spacing:1 Button: text:"7" on_press:entry.text += self.text Button: text:"8" on_press:entry.text += self.text Button: text:"9" on_press:entry.text += self.text Button: text:"+" on_press:entry.text += self.text BoxLayout: spacing:1 Button: text:"4" on_press:entry.text += self.text Button: text:"5" on_press:entry.text += self.text Button: text:"6" on_press:entry.text += self.text Button: text:"-" on_press:entry.text += self.text BoxLayout: spacing:1 Button: text:"1" on_press:entry.text += self.text Button: text:"2" on_press:entry.text += self.text Button: text:"3" on_press:entry.text += self.text Button: text:"*" on_press:entry.text += self.text BoxLayout: spacing:2 Button: text:"\u00B1" on_press:calculator.sign(entry.text) Button: text:"0" on_press:entry.text += self.text Button: text:"." on_press: entry.text+=self.text Button: text:"=" background_color: (0.1, 0.5, 0.9, 1) on_release:calculator.calculate(entry.text) |
Now if you execute the python script by typing the below command
python main.py
