from tkinter import *

window = Tk()
window.title("Welcome to Tkinter!")

# window size and position:
# width x height + xoffset + yoffset.
window.geometry('400x300+30+200')  # no spaces in spec!


for j in range(7):
    for i in range(5):
        lbl = Label(window, text="Hello_"+str(i)+str(j)+" " )
        lbl.grid(column=j, row=i)

        # once a label is created
        # its properties can be  modified any time later
        # by configure method
        if i == j:
            lbl.configure( fg = "red", font=("Courier", 14) )

window.mainloop()

# For more label properties see e.g.:
# https://docs.python.org/3/library/tkinter.ttk.html