Calculator GUI

from tkinter import *
from tkinter import ttk
import math

class Calculator:
    # Stores the current value to display in the entry
    calc_value = 0.0

    # Will define if this was the last math button clicked
    div_trigger = False
    mult_trigger = False
    add_trigger = False
    sub_trigger = False
    pwr_trigger = False


    # Called anytime a number button is pressed
    def button_press(self, value):

        # Get the current value in the entry
        entry_val = self.number_entry.get()

        # Put the new value to the right of it
        # If it was 1 and 2 is pressed it is now 12
        # Otherwise the new number goes on the left
        entry_val += value

        # Clear the entry box
        self.number_entry.delete(0, "end")

        # Insert the new value going from left to right
        self.number_entry.insert(0, entry_val)

    # Returns True or False if the string is a float
    def isfloat(self, str_val):
        try:

            # If the string isn't a float float() will throw a
            # ValueError
            float(str_val)

            # If there is a value you want to return use return
            return True
        except ValueError:
            return False

    # Handles logic when math buttons are pressed
    def math_button_press(self, value):

        # Only do anything if entry currently contains a number
        if self.isfloat(str(self.number_entry.get())):

            # make false to cancel out previous math button click
            self.add_trigger = False
            self.sub_trigger = False
            self.mult_trigger = False
            self.div_trigger = False
            self.pwr_trigger = False


            # Get the value out of the entry box for the calculation
            self.calc_value = float(self.entry_value.get())

            # Set the math button click so when equals is clicked
            # that function knows what calculation to use
            if value == "/":
                print("/ Pressed")
                self.div_trigger = True
            elif value == "*":
                print("* Pressed")
                self.mult_trigger = True
            elif value == "+":
                print("+ Pressed")
                self.add_trigger = True
            elif value == "**":
                print("** Pressed")
                self.pwr_trigger = True
            else:
                print("- Pressed")
                self.sub_trigger = True

            # Clear the entry box
            self.number_entry.delete(0, "end")

    # Performs a mathematical operation by taking the value before
    # the math button is clicked and the current value. Then perform
    # the right calculation by checking what math button was clicked
    # last
    def equal_button_press(self):
        try:
            # Make sure a math button was clicked
            if self.add_trigger or self.sub_trigger or self.mult_trigger or self.div_trigger or\
                    self.pwr_trigger or self.sqrt_trigger:

                if self.add_trigger:
                    solution = self.calc_value + float(self.entry_value.get())
                elif self.sub_trigger:
                    solution = self.calc_value - float(self.entry_value.get())
                elif self.mult_trigger:
                    solution = self.calc_value * float(self.entry_value.get())
                elif self.pwr_trigger:
                    solution = self.calc_value ** float(self.entry_value.get())
                else:
                    solution = self.calc_value / float(self.entry_value.get())


                print(self.calc_value, " ", float(self.entry_value.get()),
                      " ", solution)

                # Clear the entry box
                self.number_entry.delete(0, "end")

                self.number_entry.insert(0, solution)

        except ZeroDivisionError:
            self.number_entry.delete(0, "end")

            self.number_entry.insert(0, "cant divide by zero")



    def clear_button_press(self):
        self.number_entry.delete(0, "end")

    def sqrt_button_press(self):
        solution = math.sqrt(float(self.entry_value.get()))
        self.number_entry.delete(0, "end")

        self.number_entry.insert(0, solution)


    def __init__(self, root):
        # Will hold the changing value stored in the entry
        self.entry_value = StringVar(root, value="")

        # Define title for the app
        root.title("Calculator")

        # Defines the width and height of the window
        #root.geometry("581x236")

        # Block resizing of Window
        root.resizable(width=False, height=False)

        # Customize the styling for the buttons and entry
        style = ttk.Style()
        style.configure("TButton",
                        font="Serif 16",
                        padding=10)

        style.configure("TEntry",
                        font="Serif 50",
                        padding=20)

        # Create the text entry box
        self.number_entry = ttk.Entry(root,
                                      textvariable=self.entry_value, width=77)
        self.number_entry.grid(row=0, columnspan=7)


        # ----- 1st Row -----
        self.buttondeg = ttk.Button(root, text="Deg", width="5", command=lambda: self.button_press('7')).grid(row=1, column=0)

        self.buttonrad = ttk.Button(root, text="Rad", width="5", command=lambda: self.button_press('8')).grid(row=1, column=1)

        self.buttonx = ttk.Button(root, text="x!", width="5", command=lambda: self.button_press('9')).grid(row=1, column=2)

        self.buttonnail1 = ttk.Button(root, text="(", width="5", command=lambda: self.button_press('(')).grid(row=1, column=3)

        self.buttonnail2 = ttk.Button(root, text=")", width="5", command=lambda: self.button_press(')')).grid(row=1, column=4)

        self.buttonreminder = ttk.Button(root, text="%", width="5", command=lambda: self.button_press('9')).grid(row=1, column=5)

        self.button_clear = ttk.Button(root, text="AC", width="5", command=lambda: self.clear_button_press()).grid(row=1, column=6)

        # ----- 2nd Row -----

        self.buttoninv = ttk.Button(root, text="inv", width="5", command=lambda: self.button_press('7')).grid(row=2, column=0)

        self.buttonsin = ttk.Button(root, text="sin", width="5", command=lambda: self.button_press('7')).grid(row=2, column=1)

        self.buttonin = ttk.Button(root, text="in", width="5", command=lambda: self.button_press('7')).grid(row=2, column=2)

        self.button7 = ttk.Button(root, text="7", width="5", command=lambda: self.button_press('7')).grid(row=2, column=3)

        self.button8 = ttk.Button(root, text="8", width="5", command=lambda: self.button_press('8')).grid(row=2, column=4)

        self.button9 = ttk.Button(root, text="9", width="5", command=lambda: self.button_press('9')).grid(row=2, column=5)

        self.button_div = ttk.Button(root, text="÷", width="5", command=lambda: self.math_button_press('/')).grid(row=2, column=6)

        # ----- 3rd Row -----

        self.buttonpi = ttk.Button(root, text="π", width="5", command=lambda: self.button_press("3.14")).grid(row=3, column=0)

        self.buttoncos = ttk.Button(root, text="cos", width="5", command=lambda: self.button_press('4')).grid(row=3, column=1)

        self.buttonlog = ttk.Button(root, text="log", width="5", command=lambda: self.button_press('4')).grid(row=3, column=2)

        self.button4 = ttk.Button(root, text="4", width="5", command=lambda: self.button_press('4')).grid(row=3, column=3)

        self.button5 = ttk.Button(root, text="5", width="5", command=lambda: self.button_press('5')).grid(row=3, column=4)

        self.button6 = ttk.Button(root, text="6", width="5", command=lambda: self.button_press('6')).grid(row=3, column=5)

        self.button_mult = ttk.Button(root, text="x", width="5", command=lambda: self.math_button_press('*')).grid(row=3, column=6)

        # ----- 4th Row -----

        self.buttone = ttk.Button(root, text="e", width="5", command=lambda: self.button_press('1')).grid(row=4, column=0)

        self.buttontan = ttk.Button(root, text="tan", width="5", command=lambda: self.button_press('1')).grid(row=4, column=1)

        self.buttonsqrt = ttk.Button(root, text="√", width="5", command=lambda: self.sqrt_button_press()).grid(row=4, column=2)

        self.button1 = ttk.Button(root, text="1", width="5", command=lambda: self.button_press('1')).grid(row=4, column=3)

        self.button2 = ttk.Button(root, text="2", width="5", command=lambda: self.button_press('2')).grid(row=4, column=4)

        self.button3 = ttk.Button(root, text="3", width="5", command=lambda: self.button_press('3')).grid(row=4, column=5)

        self.button_sub = ttk.Button(root, text="-", width="5", command=lambda: self.math_button_press('-')).grid(row=4, column=6)

        # ----- 5th Row -----

        self.buttonans = ttk.Button(root, text="Ans", width="5", command=lambda: self.button_press('0')).grid(row=5, column=0)

        self.buttonexp = ttk.Button(root, text="EXP", width="5", command=lambda: self.button_press('0')).grid(row=5, column=1)

        self.buttonpwr = ttk.Button(root, text="^", width="5", command=lambda: self.math_button_press("**")).grid(row=5, column=2)

        self.button0 = ttk.Button(root, text="0", width="5", command=lambda: self.button_press('0')).grid(row=5, column=3)

        self.buttondot = ttk.Button(root, text=".", width="5", command=lambda: self.button_press('.')).grid(row=5, column=4)

        self.button_equal = ttk.Button(root, text="=", width="5", command=lambda: self.equal_button_press()).grid(row=5, column=5)

        self.button_add = ttk.Button(root, text="+", width="5", command=lambda: self.math_button_press('+')).grid(row=5, column=6)


# Get the root window object
root = Tk()

# Create the calculator
calc = Calculator(root)

# Run the app until exited
root.mainloop()