Botões no GUI tkinter do Python

Volta ao Menu Principal

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import tkinter

from tkinter import*

class Janela:
    def __init__(self, instancia_de_Tk):
        frame1 = Frame(instancia_de_Tk)
        frame1.pack()

        e1 = Entry()
        e1.insert(END, 'Digite um valor')
        e1.pack()        

raiz = Tk()
Janela(raiz)
raiz.mainloop() 

from tkinter import*

class Janela:
    def __init__(self, instancia_de_Tk):
        frame1 = Frame(instancia_de_Tk)
        frame1.pack()

        l = Label(frame1, text="Luiz A. Bertolo")        
        l.pack()        

raiz = Tk()
Janela(raiz)
raiz.mainloop() 

from tkinter import*

class Janela:
    def __init__(self, instancia_de_Tk):        
        principal=Menu(instancia_de_Tk)
        arquivo=Menu(principal)
        arquivo.add_command(label="Abrir",command=self.abrir)
        arquivo.add_command(label="Salvar",command=self.salvar)
        principal.add_cascade(label="Arquivo",menu=arquivo)
        principal.add_command(label="Ajuda",command=self.ajuda)
        instancia_de_Tk.configure(menu=principal)        

    def abrir(self): print ("abrir")
    def salvar(self): print ("salvar")
    def ajuda(self) : print ("ajuda")

raiz = Tk()
Janela(raiz)
raiz.mainloop()

import tkinter
from tkinter import ttk

root = tkinter.Tk()

style = ttk.Style()
style.map("C.TButton",
    foreground=[('pressed', 'red'), ('active', 'blue')],
    background=[('pressed', '!disabled', 'black'), ('active', 'white')]
    )

colored_btn = ttk.Button(text="Teste", style="C.TButton").pack()

root.mainloop()

from tkinter import ttk
import tkinter

root = tkinter.Tk()

style = ttk.Style()
style.layout("TMenubutton", [
   ("Menubutton.background", None),
   ("Menubutton.button", {"children":
       [("Menubutton.focus", {"children":
           [("Menubutton.padding", {"children":
               [("Menubutton.label", {"side": "left", "expand": 1})]
           })]
       })]
   }),
])

mbtn = ttk.Menubutton(text='Text')
mbtn.pack()
root.mainloop()

import tkinter as tk
from tkinter import messagebox

def main(args):
    root = tk.Tk()

    btn= tk.Button(root, text ="Click aqui", command = processaBtn)
    btn.place(bordermode=tk.OUTSIDE, height=100, width=100)

    btn1= tk.Button(root, text ="Ou Click aqui", command = processaBtn1)
    btn1.place(bordermode=tk.OUTSIDE, height=100, width=100,x=100, y=100)

    return 0
root.mainloop()

def processaBtn():
    messagebox.showinfo( "OLá", "Você pressionou o botão certo!")


def processaBtn1():
    messagebox.showinfo( "Ops!!!", "Você pressionou o botão errado!")

if __name__ == '__main__':
    import sys
    sys.exit(main(sys.argv))

from tkinter import*
 
root = Tk()
root.geometry("200x150")
frame = Frame(root)
frame.pack()
 
MenuBttn = Menubutton(frame, text = "Comida favorita", relief = RAISED)
 
Var1 = IntVar()
Var2 = IntVar()
Var3 = IntVar()
 
Menu1 = Menu(MenuBttn, tearoff = 0)
 
Menu1.add_checkbutton(label = "Pizza", variable = Var1)
Menu1.add_checkbutton(label = "Cheese Burger", variable = Var2)
Menu1.add_checkbutton(label = "Salada", variable = Var3)
 
MenuBttn["menu"] = Menu1
 
MenuBttn.pack()
root.mainloop()