Looping through buttons in Tkinter

# Import package and it's modules
from tkinter import *
# create root window
root = Tk()
# root window title and dimension
root.title("GeekForGeeks")
# Set geometry (widthxheight)
root.geometry('400x400')
# Execute Tkinter
root.mainloop()

# Import package and it's modules
from tkinter import *
# create root window
root = Tk()
# root window title and dimension
root.title("GeekForGeeks")
# Set geometry (widthxheight)
root.geometry('400x400')
# Entry Box
text = Entry(root, width = 30, bg = 'White')
text.pack(pady = 10)
# Execute Tkinter
root.mainloop()

# Import package and it's modules
from tkinter import *
# text_update function
def text_updation(language):
    text.delete(0, END)
    text.insert(0, language)
# create root window
root = Tk()
# root window title and dimension
root.title("GeekForGeeks")
# Set geometry (widthxheight)
root.geometry('400x400')
# Entry Box
text = Entry(root, width=30, bg='White')
text.pack(pady=10)
# create buttons
button_dict = {}
words = ["Python", "Java", "R", "JavaScript"]
for lang in words:
  
    # pass each button's text to a function
    def action(x = lang): 
        return text_updation(x)
      
    # create the buttons 
    button_dict[lang] = Button(root, text = lang,
                               command = action)
    button_dict[lang].pack(pady=10)
# Execute Tkinter
root.mainloop()