从python的GUI中获取整数和字符串输入

Question

I'm looking for a library to take an integer and string input from a user in Python. Some Google searches point to using Tkinter and 'Tkinter Entry', but now how do I code it for integer and code another for string?

I'm trying to create a simple input box, take an integer as input and assign that integer to some variable.

Answer 1

if you want an actual GUI, then tkinter is the simplest way, but if you only want simple raw input then input() works fine.

example:

test=input('prompt:') #take input
print(test*10) #print it ten times

simpledialog comes with python 3.x and has pop-ups that have an input box on them. but isn't as easy as input()

Answer 2

The following code provides examples using tkinter with an Entry widget to get the user input or alternatively using tkinter.simpledialog to display a window for the user to enter a value.

Here is a useful guide to using tkinter . There are many more out there for beginners like yourself

Code:

import tkinter as tk
from tkinter.simpledialog import askstring, askinteger
from tkinter.messagebox import showerror


def display_1():
    # .get is used to obtain the current value
    # of entry_1 widget (This is always a string)
    print(entry_1.get())

def display_2():
    num = entry_2.get()
    # Try convert a str to int
    # If unable eg. int('hello') or int('5.5')
    # then show an error.
    try:
       num = int(num)
    # ValueError is the type of error expected from this conversion
    except ValueError:
        #Display Error Window (Title, Prompt)
        showerror('Non-Int Error', 'Please enter an integer')
    else:
        print(num)

def display_3():
    # Ask String Window (Title, Prompt)
    # Returned value is a string
    ans = askstring('Enter String', 'Please enter any set of characters')
    # If the user clicks cancel, None is returned
    # .strip is used to ensure the user doesn't
    # enter only spaces ' '
    if ans is not None and ans.strip():
        print(ans)
    elif ans is not None:
        showerror('Invalid String', 'You must enter something')

def display_4():
    # Ask Integer Window (Title, Prompt)
    # Returned value is an int
    ans = askinteger('Enter Integer', 'Please enter an integer')
    # If the user clicks cancel, None is returned
    if ans is not None:
        print(ans)

# Create the main window
root = tk.Tk()

# Create the widgets
entry_1 = tk.Entry(root)
btn_1 = tk.Button(root, text = "Display Text", command = display_1)

entry_2 = tk.Entry(root)
btn_2 = tk.Button(root, text = "Display Integer", command = display_2)

btn_3 = tk.Button(root, text = "Enter String", command = display_3)
btn_4 = tk.Button(root, text = "Enter Integer", command = display_4)

# Grid is used to add the widgets to root
# Alternatives are Pack and Place
entry_1.grid(row = 0, column = 0)
btn_1.grid(row = 1, column = 0)
entry_2.grid(row = 0, column = 1)
btn_2.grid(row = 1, column = 1)

btn_3.grid(row = 2, column = 0)
btn_4.grid(row = 2, column = 1)

root.mainloop()