horizontal_scroll.py

def h_scrollable_area(holder):
    base_frame = Frame(holder, padx=5, pady=5)
    base_frame.pack(fill=BOTH, expand=1)
    base_frame.rowconfigure(0, weight=0)
    base_frame.columnconfigure(0, weight=1)
    can = Canvas(base_frame, bg="white")
    can.pack(side=TOP, expand=1, fill=BOTH)
    scrollArea = Frame(base_frame, bg="white")
    scrollArea.pack(side=TOP, expand=1, fill=BOTH)
    can.create_window(0, 0, window=scrollArea, anchor='nw')
    Scroll = Scrollbar(base_frame, orient=HORIZONTAL)
    Scroll.config(command=can.xview)
    Scroll.pack(side=BOTTOM, fill=X)
    can.config(xscrollcommand=Scroll.set)
    scrollArea.bind("<Configure>", lambda e=Event(), c=can: update_scrollregion(e, c))
    return scrollArea, can ##scrollArea is the frame to put stuff into. can is the Canvas in case you need to bind additional options or extra configurations.
def update_scrollregion(event, can):
    can.configure(scrollregion=can.bbox("all"))
    pass

##usage
#root = Tk()
#window = Frame(root)
#window.pack(side=TOP)
#scroll, can = h_scrollable_area(window)
#for i in range(20)
#   Button(scroll, text=i, width=5).pack(side=LEFT)
#root.mainloop()