FirstGUI.PY

from tkinter import *
from tkinter import messagebox
a=Tk()
a.geometry("300x300")
a.title("Registration form")

def fun():
    messagebox.showinfo("Hello","Login success")
    
L1=Label(a,text="Name:")
L1.grid(row=0,column=0)

E1=Entry(a)
E1.grid(row=0,column=1)

L2=Label(a,text="Roll no:")
L2.grid(row=1,column=0)

E1=Entry(a)
E1.grid(row=1,column=1)

L3=Label(a,text="Branch:")
L3.grid(row=2,column=0)

C1=Checkbutton(a,text="CSE")
C1.grid(row=3,column=0)

C2=Checkbutton(a,text="AIML")
C2.grid(row=4,column=0)

L4=Label(a,text="Gender:")
L4.grid(row=5,column=0)

R1=Radiobutton(a,text="Male")
R1.grid(row=6,column=0)
R1.select()
 
R2=Radiobutton(a,text="Female")
R2.grid(row=7,column=0)
R2.deselect()

L5=Label(a,text="Programming Language:")
L5.grid(row=8,column=1)

Lb=Listbox(a,height=3)
Lb.insert(1,"Python")
Lb.insert(2,"Java")
Lb.insert(3,"C++")
Lb.grid(row=9,column=1)

b=Button(a,text="submit",command=fun)
b.grid(row=10,column=1)

a.mainloop()