Python tkinter GUI program for multi line text entery box by text

We will keep one Label along with a text box.
Basics of Python Tkinter

Tkinter Text style & to read input & display text on click event of button by get() & set() methods

User input for multiline of text. ( for single line of text use Entry)

t1=tk.Text(parent_window,options)

parent_window : Declared Parent window
options : Various options can be added, list is given below.

import tkinter as tk
my_w = tk.Tk()
my_w.geometry("500x500")  

l1 = tk.Label(my_w,  text='Your Name', width=10 )  # added one Label 
l1.grid(row=1,column=1) 

t1 = tk.Text(my_w,  height=1, width=8,bg='yellow') # added one text box
t1.grid(row=1,column=2) 

my_w.mainloop()

To manage layout read more on grid()
Reading data of text box starting from first char till end

t1.get("1.0",END)

"1.0" mean Line 1 , first char. Similarly END is the string end including the line break. To remove line break we have to modify like this.

t1.get("1.0",'end-1c')

Adding data to a text box my_str1 is the string variable to insert.

t2.insert(tk.END, my_str1)

Above two lines are most important to develop applications.

Note that the widely used option textvariable is not available with Text widget

There are many options we can add to text box, the list is available below.

Now let us add the click event of the button linked to text box. We will enter data in our text box , on click of the button the entered data will be displayed at another Label.

import tkinter as tk
from tkinter import BOTH, END, LEFT
my_w = tk.Tk()
my_w.geometry("500x300")  

def my_upd():
    my_str.set(t1.get("1.0",END))  # read the text box data and update the label

my_str = tk.StringVar()

l1 = tk.Label(my_w,  text='Your Name', width=10 ) # added one Label 
l1.grid(row=1,column=1) 

t1 = tk.Text(my_w,  height=1, width=20,bg='yellow')# added one text box
#t1=Entry(my_w, width=10)
t1.grid(row=1,column=2) 

b1 = tk.Button(my_w, text='Update', width=10,bg='red',command=lambda: my_upd()) # button added
b1.grid(row=1,column=3) 

l2 = tk.Label(my_w,  textvariable=my_str, width=20 ) # added one Label 
l2.grid(row=1,column=4) 
my_str.set(" I will update")

my_w.mainloop()

Let us update one text box by using data from another text box.

import tkinter as tk
from tkinter import BOTH, END, LEFT
my_w = tk.Tk()
my_w.geometry("500x400")  

def my_upd():
    my_str1=t1.get("1.0",END)  # read from one text box t1
    t2.insert(tk.END, my_str1) # Add to another text box t2
    
my_str = tk.StringVar()

l1 = tk.Label(my_w,  text='Your Name', width=10 ) # added one Label 
l1.grid(row=1,column=1) 

t1 = tk.Text(my_w,  height=1, width=20,bg='yellow')# added one text box
#t1=Entry(my_w, width=10)
t1.grid(row=1,column=2) 

b1 = tk.Button(my_w, text='Update', width=10,bg='red',command=lambda: my_upd()) # button added
b1.grid(row=1,column=3) 

t2 = tk.Text(my_w, height=1, width=15, bg='#00f000' ) # added one textbox to read 
t2.grid(row=1,column=4) 

my_w.mainloop()

Delete ( or empty ) text box

We can remove data from first text box after updating the second text box. In above code you can two more lines inside the function.

def my_upd():
    my_str1=t1.get("1.0",END)  # read from one text box t1
    t2.insert(tk.END, my_str1) # Add to another text box t2
    t1.delete('1.0',END)       # Delete from position 0 till end 
    t1.update()                # update the delete

Focus text box

To keep the ( blinking ) cursor inside text box

t1.focus()

Adding Scrollbar to Text widget

Options can be used in a textbox

Background colour of the text box

t1 = tk.Text(my_w,  width=8, height=1, bg='yellow')

We can update the background colour by using configure()

We have two radio buttons , on select of radio buttons we can change the background colour of the text box.

t1.configure(bg=r1_v.get())

Read more on Radio buttons
Full code is here

import tkinter as tk
my_w = tk.Tk()
my_w.geometry("200x200")  

l1 = tk.Label(my_w,  text='Your Name' ) # added one Label 
l1.grid(row=1,column=1) 

t1 = tk.Text(my_w,  width=8, height=1)
t1.grid(row=1,column=2) 
###### Radio buttons #######
def my_upd():
    t1.configure(bg=r1_v.get()) # update the colour 

r1_v = tk.StringVar()  # We used string variable here
r1_v.set('Yellow')     # Can assign value Appear or Failed

r1 = tk.Radiobutton(my_w, text='Yellow', variable=r1_v,
 value='Yellow',command=my_upd)
r1.grid(row=2,column=1) 

r2 = tk.Radiobutton(my_w, text='Red', variable=r1_v,
 value='Red',command=my_upd)
r2.grid(row=2,column=2) 

my_w.mainloop()

bd	Border around the Text. Default width is 2 `t1 = tk.Text(my_w, width=8, height=1, bd=6)`

cursor

cursor that will appear once the mouse is over the text box

t1 = tk.Text(my_w,  width=8, height=1,cursor='circle')

You can get a list of cursor shapes in our Tkinter button page

exportselection

Selection is to be exported or not. The default is usually for widgets to export selection.

t1 = tk.Text(my_w,  width=20, height=1,
	exportselection=1)

font

Managing font size, family, type etc

t1 = tk.Text(my_w,  width=20, height=1,font=18)

font size with family

my_font=('times', 8, 'bold')
t1 = tk.Text(my_w,  width=20, height=1,font=my_font)

Colour used for fg

l1 = tk.Label(my_w,  text='Your Name' ) # added one Label 
l1.grid(row=1,column=1) 

t1 = tk.Text(my_w,  width=10, height=1,fg='red')
t1.grid(row=1,column=2) 

t2 = tk.Text(my_w,  width=10, height=1,fg='green')
t2.grid(row=1,column=3)

height

Height in number of lines

t1 = tk.Text(my_w,  width=10, height=2)

HeighlightBackground and heightlightcolor

highlightbackground

focus highlight color ( the rectangle around the text box ) when text box is not in focus.

( Note keep highlightthickness = 2 to get a visible output of the rectangle around the text box )

t1 = tk.Text(my_w,  width=10,height=1,highlightbackground='red')

highlightcolor

focus highlight ( the rectangle around the text box ) color when text box is in focus

t1 = tk.Text(my_w,  width=10,height=1,highlightcolor='red')

highlightthickness

The width of the focus heighlight. ( the rectangle around the text box ) Default value is 1. `t1 = tk.Text(my_w, width=10,height=1,highlightthickness=2)`

insertbackground

Blinking Cursor background colour.

Here we kept insertwidth=15 to make the cursor thick enough to make it visible.

We have changed insertborderwidth=10 to make the 3 D effect visible.

t1 = tk.Text(my_w,width=10,height=1,
insertbackground='red',insertwidth=15)

insertborderwidth

Widht of the border of Cursor to give 3 D Effect.

t1 = tk.Text(my_w,width=10,height=1,
insertborderwidth=8, insertwidth=18)

insertofftime

The off time in milliseconds for the blinking cursor. For 0 value it will not blink.

t1 = tk.Text(my_w,width=10,height=1,
insertofftime=1000,insertontime=1000)

insertontime

The on time in milliseconds for the blinking cursor.

t1 = tk.Text(my_w,width=10,height=1,
insertofftime=1000,insertontime=1000)

insertwidth

Width of the blinking cursor

t1 = tk.Text(my_w,  width=10,height=1,insertwidth=15)

justify	Text justification . Values can be LEFT RIGHT or CENTER

relief The text box 3 D effect style. It can take these values
raised , sunken ,flat, ridge, solid & groove

import tkinter as tk
my_w = tk.Tk()
my_w.geometry("250x200")  
l1 = tk.Label(my_w,  text='relief' ) # added one Label 
l1.grid(row=1,column=1) 

l1 = tk.Label(my_w,  text='Raised' ) # added one Label 
l1.grid(row=2,column=1) 

t1 = tk.Text(my_w,  width=10,height=1,relief='raised')
t1.grid(row=2,column=2) 

l1 = tk.Label(my_w,  text='sunken' ) # added one Label 
l1.grid(row=3,column=1) 

t1 = tk.Text(my_w,  width=10,height=1,relief='sunken')
t1.grid(row=3,column=2)

l1 = tk.Label(my_w,  text='flat' ) # added one Label 
l1.grid(row=4,column=1) 

t1 = tk.Text(my_w,  width=10,height=1,relief='flat')
t1.grid(row=4,column=2)

l1 = tk.Label(my_w,  text='ridge' ) # added one Label 
l1.grid(row=5,column=1) 
t1 = tk.Text(my_w,  width=10,height=1,relief='ridge')
t1.grid(row=5,column=2)

l1 = tk.Label(my_w,  text='solid' ) # added one Label 
l1.grid(row=6,column=1) 
t1 = tk.Text(my_w,  width=10,height=1,relief='solid')
t1.grid(row=6,column=2)

l1 = tk.Label(my_w,  text='groove' ) # added one Label 
l1.grid(row=7,column=1) 

t1 = tk.Text(my_w,  width=10,height=1,relief='groove')
t1.grid(row=7,column=2)

my_w.mainloop()

selectbackground	The background colour of the selected text inside the textbox. `t1 = tk.Text(my_w, width=10,height=1, selectbackground='red')`
selectborderwidth	The width of the boarder around selected text
selectforeground	The colour of the font of selected text `t1 = tk.Text(my_w, width=10,height=1, selectforeground='yellow')`
width	Width in number of chars `t1 = tk.Text(my_w, height=1, width=20)`
xscrollcommand	Add scroll bar to text box

Methods

Delete chars from start position to end position

l2.delete(1.4,1.7) # from 4th till 7th position of line one

l2.delete(1.0,END) # from starting till end

get()

print(l2.get(1.4,1.7)) # print from 4th till 7th position of line one
print(l2.get(1.0,END))  # Print from starting till end

Exercise on Text
Ask user to enter Name, marks ( in three subjects Physics, Chemistry, Math ) and attendance of a student. On Update , the data will be stored in a Dictionary and finally in a CSV file. ( Break it in parts, First display the data using print(), then create Dictionary and then save as CSV file. )
Create one user data entry box in the window and on click of the Save button the text entered in the entry box will be saved into one text file using the filedialog.
( Solution ) Save data entered by user in Tkinter window

Python Tkinter Entry How to Validate user entered data

Python Tkinter Button Python- Tutorials

Python tkinter Text

Delete ( or empty ) text box

Focus text box

Options can be used in a textbox

Methods

get()

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