Tkinter-Calculator

Author: SyedShagufta

Projects/tkinter-calculator/Output/ErrorHandling-1.png

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+import tkinter as tk
+
+calculation = ""
+
+
+def add_to_calculation(symbol):
+    global calculation
+    calculation += str(symbol)
+    # now we have to clear the text field
+    text_field.delete(1.0, "end")
+    # later we will insert the results
+    text_field.insert(1.0, calculation)
+
+
+def evaluate():
+    global calculation
+    try:
+        calculation = str(eval(calculation))
+        text_field.delete(1.0, "end")
+        text_field.insert(1.0, calculation)
+    except:
+        clear_field()
+        text_field.insert(1.0, "ERROR")
+
+
+def clear_field():
+    global calculation
+    calculation = ""
+    text_field.delete(1.0, "end")
+
+
+# ------------------------------- UI -------------------------------------------------- #
+
+window = tk.Tk()
+window.geometry("340x370")
+window.title("My Calculator")
+window.config(background="black", highlightthickness=0)
+text_field = tk.Text(window, height=2, width=20, font=("Helvetica", 24), background="black", foreground="white", highlightthickness=0)
+text_field.grid(columnspan=5)
+
+# button - AC
+btn_ac = tk.Button(window, text="AC", command=lambda: clear_field(), width=5, font=("Helvetica", 14), background="#5f5f5f", foreground="black")
+btn_ac.grid(row=1, column=0,padx=5, pady=10)
+# button brackets
+btn_bracket1 = tk.Button(window, text="(", command=lambda: add_to_calculation('('), width=5, font=("Helvetica", 14), background="#5f5f5f", foreground="black")
+btn_bracket1.grid(row=1, column=1)
+
+btn_bracket2 = tk.Button(window, text=")", command=lambda: add_to_calculation(')'), width=5, font=("Helvetica", 14), background="#5f5f5f", foreground="black")
+btn_bracket2.grid(row=1, column=2)
+
+# division
+btn_div = tk.Button(window, text="÷", command=lambda: add_to_calculation('/'), width=5, font=("Helvetica", 14), background="#FFA700", foreground="white")
+btn_div.grid(row=1, column=3)
+
+# buttons 7 - 9
+btn_7 = tk.Button(window, text="7", command=lambda: add_to_calculation(7), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_7.grid(row=2, column=0, padx=5, pady=10)
+
+btn_8 = tk.Button(window, text="8", command=lambda: add_to_calculation(8), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_8.grid(row=2, column=1)
+
+btn_9 = tk.Button(window, text="9", command=lambda: add_to_calculation(9), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_9.grid(row=2, column=2)
+
+# multiplication
+btn_mul = tk.Button(window, text="x", command=lambda: add_to_calculation('*'), width=5, font=("Helvetica", 14), background="#FFA700", foreground="white")
+btn_mul.grid(row=2, column=3)
+
+# buttons 4 - 6
+btn_4 = tk.Button(window, text="4", command=lambda: add_to_calculation(4), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_4.grid(row=3, column=0, padx=5, pady=10)
+
+btn_5 = tk.Button(window, text="5", command=lambda: add_to_calculation(5), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_5.grid(row=3, column=1)
+
+btn_6 = tk.Button(window, text="6", command=lambda: add_to_calculation(6), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_6.grid(row=3, column=2)
+
+# subtraction
+btn_sub = tk.Button(window, text="-", command=lambda: add_to_calculation('-'), width=5, font=("Helvetica", 14), background="#FFA700", foreground="white")
+btn_sub.grid(row=3, column=3)
+
+# buttons 1 to 3
+btn_1 = tk.Button(window, text="1", command=lambda: add_to_calculation(1), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_1.grid(row=4, column=0, padx=5, pady=10)
+
+btn_2 = tk.Button(window, text="2", command=lambda: add_to_calculation(2), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_2.grid(row=4, column=1)
+
+btn_3 = tk.Button(window, text="3", command=lambda: add_to_calculation(3), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_3.grid(row=4, column=2)
+
+btn_add = tk.Button(window, text="+", command=lambda: add_to_calculation('+'), width=5, font=("Helvetica", 14), background="#FFA700", foreground="white")
+btn_add.grid(row=4, column=3)
+
+# zero button
+btn_0 = tk.Button(window, text="0", command=lambda: add_to_calculation(0), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_0.grid(row=5, column=0, padx=5, pady=5)
+
+# mod button
+btn_mod = tk.Button(window, text="%", command=lambda: add_to_calculation('%'), width=5, font=("Helvetica", 14), background="#A9A9A9", foreground="white")
+btn_mod.grid(row=5, column=1)
+
+# equal button
+btn_equal = tk.Button(window, text="=", command=lambda: evaluate(), width=13, font=("Helvetica", 14), background="#FFA700", foreground="white")
+btn_equal.grid(row=5, column=2, columnspan=2)
+
+window.mainloop()