Got it, let's solve this scroll issue! Since Tkinter won't let you attach a scrollbar directly to the root window, the standard workaround is to nest your form inside a Canvas widget (which does support scrollbars) and add mouse/keyboard controls for scrolling. Here's how to tweak your code to make that work:

Modified Code with Scroll Support #

from Tkinter import *

def on_scroll(*args):
    # Link scrollbar movement to canvas scrolling
    canvas.yview(*args)

def on_mousewheel(event):
    # Handle mouse wheel (adjust delta for cross-system consistency)
    canvas.yview_scroll(int(-1*(event.delta/120)), "units")

def on_keyboard(event):
    # Handle up/down arrow keys for scrolling
    if event.keysym == 'Up':
        canvas.yview_scroll(-1, "units")
    elif event.keysym == 'Down':
        canvas.yview_scroll(1, "units")

root = Tk()
root.title('test')
root.geometry("400x400")

# Set up scrollbar and canvas
scrollbar = Scrollbar(root, orient="vertical", command=on_scroll)
canvas = Canvas(root, yscrollcommand=scrollbar.set, bg="white")
scrollbar.pack(side="right", fill="y")
canvas.pack(side="left", fill="both", expand=True)

# Create a frame to hold all your form widgets
form_frame = Frame(canvas)
# Embed the frame into the canvas
canvas.create_window((0, 0), window=form_frame, anchor="nw")

# Generate your 40 fields
for i in range(40):
    Label(form_frame, text="Field {} ".format(i)).grid(row=i, column=0, padx=5, pady=2)
    Entry(form_frame).grid(row=i, column=1, padx=5, pady=2)

# Update canvas scroll region when the frame's size changes
def update_scroll_region():
    canvas.config(scrollregion=canvas.bbox("all"))

# Bind events for dynamic scroll region and user input
form_frame.bind("<Configure>", lambda e: update_scroll_region())
canvas.bind_all("<MouseWheel>", on_mousewheel)
canvas.bind_all("<KeyPress-Up>", on_keyboard)
canvas.bind_all("<KeyPress-Down>", on_keyboard)

root.mainloop()

Key Details Explained #

• Canvas + Frame Combo: All your labels and entries live inside form_frame, which is embedded into the canvas. This lets the canvas act as a scrollable viewport for the frame.
• Scrollbar Link: The on_scroll function connects the scrollbar's movement to the canvas's vertical view.
• Mouse Wheel Support: The on_mousewheel function adjusts the canvas view based on wheel input—we normalize the delta value to work across different operating systems.
• Keyboard Scrolling: The on_keyboard function listens for up/down arrow presses to scroll, even if focus is on an entry field (thanks to bind_all).
• Dynamic Scroll Region: The update_scroll_region function makes sure the canvas knows the full size of the frame, so you can scroll all the way to the bottom of your 40 fields.

Quick Note for Python 3 Users #

If you're using Python 3, just replace from Tkinter import * with from tkinter import *—the rest of the code works the same.

内容的提问来源于stack exchange，提问作者Ashish soni