Python graphical interface basics: getting user input in the text box

introduction

In Python graphical user interface ( GUI ) applications, a text box is a common control used to receive user input information. Getting the text entered by the user into a text box is one of the core features of many applications. In this article, we will learn how to use Python ’s Tkinter library to create a text box and how to get the text content entered by the user in the text box.

Introduction to the Tkinter library

Tkinter is a module in the Python standard library for creating GUI applications. It provides a set of tools and components for building GUI elements such as windows, buttons, labels, and text boxes, and supports event handling mechanisms to monitor and respond to user interactions.

Step 1: Import the Tkinter module

First, make sure your Python environment has the Tkinter library installed . Then, import the Tkinter module in your Python script to use the functionality of the Tkinter library.

import tkinter as tk

Step 2: Create Tkinter window

When using Tkinter to create a GUI application, you first need to create a Tkinter window object, usually called root. This window will serve as the application's main window.

root = tk.Tk()
root.title("获取用户输入示例")

In the above code, we create a Tkinter window object rootand set the title of the window to "Get User Input Example".

Step 3: Create text box

Next, we will create a text box that will receive input text from the user. In Tkinter , we can use Entrythe component to create text boxes.

Here's an example of how to create a text box and add it to a window:

entry = tk.Entry(root)
entry.pack()

In the above example, we created a text box entryand then pack()added it to the window using the method.

Step 4: Get user input in text box

To get user input in a textbox, we can use the textbox's get()method. This method will return the current text content in the text box.

Here's an example of how to get user input in a textbox and display it in a label:

def get_user_input():
    user_input = entry.get()
    result_label.config(text="用户输入：" + user_input)

# 创建一个按钮，用于触发获取用户输入的操作
get_input_button = tk.Button(root, text="获取用户输入", command=get_user_input)
get_input_button.pack()

# 创建一个标签，用于显示用户输入的结果
result_label = tk.Label(root, text="")
result_label.pack()

In the above example, we defined a get_user_inputfunction called that uses the text box's get()method to get the text entered by the user in the text box and display it in the label result_label. We also created a button get_input_buttonthat when the user clicks the button will trigger get_user_inputa function to get user input.

Step 5: Start Tkinter main event loop

The final step is to start Tkinter 's main event loop, which will make the window interactive, allowing the user to enter text and get user input.

root.mainloop()

Complete sample code

Here is a complete example code showing how to create a Tkinter window, text box, button and how to get user input in the text box:

import tkinter as tk

def get_user_input():
    user_input = entry.get()
    result_label.config(text="用户输入：" + user_input)

# 创建Tkinter窗口
root = tk.Tk()
root.title("获取用户输入示例")

# 创建文本框
entry = tk.Entry(root)
entry.pack()

# 创建一个按钮，用于触发获取用户输入的操作
get_input_button = tk.Button(root, text="获取用户输入", command=get_user_input)
get_input_button.pack()

# 创建一个标签，用于显示用户输入的结果
result_label = tk.Label(root, text="")
result_label.pack()

# 启动Tkinter主事件循环
root.mainloop()

Rendering:

Code explanation

Let us explain the above code line by line:

• We imported the Tkinter module in order to use the functionality of the Tkinter library.

• Created a Tkinter window object rootand set the title of the window to "Get User Input Example".

• A function named is defined get_user_input, which uses the text box's get()method to get the text entered by the user in the text box and displays it in the label result_label.

• A text box is created entryand pack()added to the window using the method.

• A button is created get_input_button, and when the user clicks the button, get_user_inputa function is triggered to obtain user input.

• Created a label result_labelthat displays the results of user input.

• Finally, Tkinter 's main event loop is started , making the window interactive.

in conclusion

In this article, we learned how to use Python ’s Tkinter library to create a text box and get the text entered by the user in the text box. Text boxes are important components in many GUI applications and are used for user input and interaction. By using Tkinter 's Entrycomponents and event handling mechanism, we can easily implement this functionality and obtain user input when the user clicks the button. Continuing to learn Tkinter , you will be able to build more complex and interesting GUI applications to meet the needs of different users.