tkinter Python GUI Frame Positioning

How can you position the frames (and or elements inside the frames) such that the radio buttons at the bottom are shifted to the left outer edge of the GUI interface and the title is shifted to the center of the GUI interface?

GUI

import tkinter

root = tkinter.Tk()
root.title('Bookings')
root.geometry('700x500')

frame_title = tkinter.Frame(root)
frame_fields = tkinter.Frame(root)
frame_scan = tkinter.Frame(root)
frame_credentials = tkinter.Frame(root)
frame_site = tkinter.Frame(root)
frame_change = tkinter.Frame(root)


def passx():
    pass


frame_title.grid(row=0, column=0, padx=(50, 0))
title = tkinter.Label(frame_title, text="Bookings Scan", font=("Helvetica", 24))
title.grid(pady=(27, 10))
frame_fields.grid(row=1, column=0, padx=(30, 0), pady=(10, 0))
start_date_lbl = tkinter.Label(frame_fields, text="Enter the start date: ", font=("Helvetica", 16))
start_date_lbl.grid(column=0, row=0, pady=15)
start_date_unp = tkinter.Entry(frame_fields, width=11, font=("Helvetica", 16))
start_date_unp.grid(column=1, row=0)
start_date = start_date_unp.get()
end_date_lbl = tkinter.Label(frame_fields, text="Enter the end date: ", font=("Helvetica", 16))
end_date_lbl.grid(column=0, row=1)
end_date_unp = tkinter.Entry(frame_fields, width=11, font=("Helvetica", 16))
end_date_unp.grid(column=1, row=1)
end_date = end_date_unp.get()
frame_scan.grid(row=1, column=1, padx=(45, 0))
scan_btn = tkinter.Button(frame_scan, text="Scan", command=passx, height=2, width=8, font=("Helvetica", 16))
scan_btn.grid(row=0, column=0, pady=(10, 0))
frame_credentials.grid(row=2, column=0)
credential = tkinter.IntVar(value=0)
tkinter.Radiobutton(frame_credentials, text='Username', variable=credential, value=1, font=("Helvetica", 16)).grid(column=1, row=4, sticky='W', pady=(43, 50))
tkinter.Radiobutton(frame_credentials, text='Password', variable=credential, value=2, font=("Helvetica", 16)).grid(column=1, row=5, sticky='W')
frame_site.grid(row=2, column=1, pady=(40, 0))
site = tkinter.IntVar(value=0)
tkinter.Radiobutton(frame_site, text='PearsonVUE', variable=site, value=1, font=("Helvetica", 16)).grid(column=0, row=0, sticky='W', pady=8)
tkinter.Radiobutton(frame_site, text='Kryterion', variable=site, value=2, font=("Helvetica", 16)).grid(column=0, row=1, sticky='W')
tkinter.Radiobutton(frame_site, text='PSI PAN', variable=site, value=3, font=("Helvetica", 16)).grid(column=0, row=2, sticky='W', pady=8)
tkinter.Radiobutton(frame_site, text='Scantron', variable=site, value=4, font=("Helvetica", 16)).grid(column=0, row=3, sticky='W')
tkinter.Radiobutton(frame_site, text='PSI Atlas', variable=site, value=5, font=("Helvetica", 16)).grid(column=0, row=4, sticky='W', pady=8)
frame_change.grid(row=2, column=2, padx=25, pady=(20, 0))
change_btn = tkinter.Button(frame_change, text="Change", command=passx, height=2, width=8, font=("Helvetica", 16))
change_btn.grid(column=3, row=3)
root.mainloop()

Answer

To achieve the goal:

• set columnspan=3 in frame_title.grid(...)
• set columnspan=2 in frame_fields.grid(...)
• move frame_scan to column 2

...
frame_title.grid(row=0, column=0, columnspan=3) ### added columnspan=3
...
frame_fields.grid(row=1, column=0, padx=(30, 0), pady=(10, 0), columnspan=2) ### added columnspan=2
...
frame_scan.grid(row=1, column=2, padx=(45, 0)) ### moved to column 2
...

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The output: