Simple Calculator

Calculator.py

@@ -0,0 +1,43 @@
+from tkinter import *
+
+def click(event):
+    global scrval
+    text = event.widget.cget("text")
+    if text == "=":
+        if scrval.get().isdigit():
+            value = int(scrval.get())
+        else:
+            value = eval(screen.get())
+        scrval.set(value)
+
+    elif text == "C":
+        scrval.set("")
+        screen.update()
+    else:
+        scrval.set(scrval.get() + text)
+        screen.update()
+
+
+root=Tk()
+root.geometry("500x550")
+root.title("GUI Simple Calculator")
+
+scrval = StringVar()
+scrval.set("")
+
+screen = Entry(root, textvar=scrval, font="lucida 30 bold", bd=4,relief=SUNKEN)
+screen.pack()
+
+frame = Frame(root, bg="grey", pady=10)
+list1 = ["7", "8", "9", "C", "4", "5", "6", "+", "1", "2", "3", "-" ,".", "0", "=", "*", "%", "!", "^", "/"]
+i = 0
+for n in list1:
+    # here width of button means 1 text width
+    btn = Button(frame, text=n, font="lucida 20 bold", padx=50, width =1,pady=25 )
+    btn.grid(row=int(i / 4), column=i % 4)
+    i = i + 1
+
+    btn.bind("<Button-1>", click)
+frame.pack(fill=X)
+
+root.mainloop()