Set a Value in Entry Widget in Tkinter Python

In Tkinter, the Entry widget is used to take input from the user. You can set a default value in the Entry field using the insert() method or by using the StringVar class.

Setting a default value in an Entry widget is useful when you want to prepopulate the input field with commonly used values or placeholders.

In this tutorial, we will go through examples to set values in an Entry Widget in Tkinter Python.

Examples

1. Setting a Value in Entry widget Using insert() Method

In this example, we will use the insert() method to insert a default value in an Entry widget.

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import tkinter as tk

# Create the main window
root = tk.Tk()
root.title("Tkinter Entry Example - tutorialkart.com")
root.geometry("400x200")

# Create an Entry widget
entry = tk.Entry(root)
entry.pack(pady=20)

# Set a default value
entry.insert(0, "Enter your name")

root.mainloop()

Output in Windows:

An Entry field is displayed with the text “Enter your name” already filled in.

Setting a Value in Entry widget Using insert() Method in Tkinter Python

2. Setting a Value Using StringVar() in Entry Widget

Another way to set a default value is by using the StringVar class, which allows you to dynamically control the value of an Entry widget.

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import tkinter as tk

# Create the main window
root = tk.Tk()
root.title("Tkinter Entry Example - tutorialkart.com")
root.geometry("400x200")

# Define a StringVar
entry_text = tk.StringVar()
entry_text.set("Default Value")

# Create an Entry widget with StringVar
entry = tk.Entry(root, textvariable=entry_text)
entry.pack(pady=20)

root.mainloop()

Output in Windows:

An Entry field is displayed with the text “Default Value” already filled in.

Setting a Value Using StringVar() in Entry Widget in Tkinter Python

3. Updating the Entry Value on Button Click

In this example, we will update the Entry widget’s value dynamically when a button is clicked.

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import tkinter as tk

# Create the main window
root = tk.Tk()
root.title("Tkinter Entry Example - tutorialkart.com")
root.geometry("400x200")

# Create an Entry widget
entry = tk.Entry(root)
entry.pack(pady=10)

# Function to update Entry value
def update_value():
    entry.delete(0, tk.END)  # Clear existing text
    entry.insert(0, "Updated Value")

# Create a button to update Entry value
button = tk.Button(root, text="Set Value", command=update_value)
button.pack(pady=10)

root.mainloop()

Output in Windows:

An Entry field appears empty initially.

Updating the Entry Value on Button Click in Tkinter Python - Initial Screen

When the button is clicked, “Updated Value” appears in the Entry field.

Updating the Entry Value on Button Click in Tkinter Python - After Button Click

Conclusion

In this tutorial, we explored how to set a value in an Entry widget in Tkinter using:

  • The insert() method
  • The StringVar() class
  • Updating the Entry value dynamically with a button click

Using these methods, you can prepopulate or update input fields dynamically in your Tkinter applications.