Welcome folks today in this blog post we will be building a simple 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 kivy.require('1.2.0') from kivy.app import App from kivy.uix.widget import Widget from kivy.uix.button import Button from kivy.uix.textinput import TextInput from kivy.clock import Clock from kivy.properties import ObjectProperty, NumericProperty, ListProperty from kivy.factory import Factory from kivy.config import ConfigParser from kivy.uix.settings import Settings class Calculator(Widget): ti = ObjectProperty(None) lastOp = "" memorynum = 0.0 operation = False def _execute(self, op): if op in "0123456789.": if self.lastOp == "=": self.lastOp = "" self._setText(op) elif op in "+-/x^" and self.lastOp != "=": if self.lastOp != "": self._exeOp(op) else: self.memorynum = float(self.ti.text) self.lastOp = op self.operation = True elif op in "Cc": self.ti.text = "" self.memorynum = 0.0 self.lastOp = "" elif op == "<" and self.lastOp != "=": self.ti.text = self.ti.text[:-1] elif op == "=" and self.lastOp != "=": self._exeOp(op) self.memorynum = 0.0 self.lastOp = "=" self.operation = True elif op == "1/2" and self.lastOp != "=": self.ti.text = str(float(self.ti.text)/2) def _exeOp(self, op): if self.lastOp == "+": self.memorynum += float(self.ti.text) elif self.lastOp == "-": self.memorynum -= float(self.ti.text) elif self.lastOp == "x": self.memorynum *= float(self.ti.text) elif self.lastOp == "/": self.memorynum /= float(self.ti.text) elif self.lastOp == "^": self.memorynum = self.memorynum ** float(self.ti.text) self.ti.text = str(self.memorynum) def _setText(self, op): if op == "." and "." in self.ti.text: return if self.operation: self.ti.text = op self.operation = False else: self.ti.text += op class CalcApp(App): use_kivy_settings = False def build(self): self.Calc = Calculator() return self.Calc def build_config(self, config): config.setdefaults('Calculator Colors', \ { 'CC' : 'Off', 'NB' : 'default', 'NBT': 'default', 'OB' : 'default', 'OBT' : 'default', 'SB' : 'default', 'SBT' : 'default', 'TIB' : 'default', 'TIF' : 'default' }) def on_config_change(self, config, section, key, value): if config is self.config: if key == "CC" and value == "On": print("fuck") else: print(section, key, value) def build_settings(self, settings): settings.add_json_panel('Customization', self.config, "settings_calc.json") def on_pause(self): return True def on_resume(self): pass if __name__=='__main__': CA = CalcApp() CA.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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#:kivy 1.2.0 <CalcButton@Button>: the_root: self.parent.my_root on_press: self.the_root._execute(self.text) background_color: [1, 1, 1, 1] color: [1, 1, 1, 1] font_size: self.width/2 <CalcButtonOp@CalcButton>: background_color: [0.6, 0.6, 0.6, 1] color: [0.2, 0.8, 1, 1] <CalcButtonSpecial@CalcButton>: background_color: [0.3, 0.6, 0.6, 1] color: [0, 1, 1, 1] <Calculator>: ti: myti BoxLayout: size: root.width, root.height orientation: "vertical" spacing: 10 padding: [5, 5, 5, 5] TextInput: size_hint: 1, 0.20 id: myti text: "" readonly: True font_size: 100 background_color: [1, 1, 1, 1] foreground_color: [0, 0, 0, 1] GridLayout: cols: 4 rows: 5 spacing: [8, 8] my_root: root CalcButtonSpecial: text: "^" CalcButtonSpecial: text: "1/2" CalcButtonSpecial: text: "<" CalcButtonSpecial: text: "C" CalcButton: text: "7" CalcButton: text: "8" CalcButton: text: "9" CalcButtonOp: text: "x" CalcButton: text: "4" CalcButton: text: "5" CalcButton: text: "6" CalcButtonOp: text: "-" CalcButton: text: "1" CalcButton: text: "2" CalcButton: text: "3" CalcButtonOp: text: "+" CalcButton: text: "0" CalcButton: text: "." CalcButtonOp: text: "=" CalcButtonOp: text: "/" |
Now if you execute the above python script app.py by typing the below command as shown below
python app.py
