How can I make certain text bold in Python string formatting?

Question

I have a snippet where I generate a string that includes an original number (original_number) and its corresponding Roman numeral (roman_number). I want to format this string so that the original number and the Roman numeral are displayed in bold. Here's the relevant part of the code:

explanation_text = f"{original_number} is {roman_number} in Roman numerals:\n\n" + " + ".join(explanation)

How can I modify this code to ensure that both original_number and roman_number are displayed in bold font when displayed?

I tried using \033[1m for bold formatting However, it didn't work. The text was not displayed in bold font.

Short answer: you can't. Longer answer: it depends on how you're going to display this string. Are you wanting to print it on the console? Display in a tkinter label? A tkinter text widget? Something else? — Bryan Oakley
– Bryan Oakley, Commented May 24, 2024 at 17:37
To expand on @BryanOakley's comment: if your intention is to do this in tkinter (which I assume, given the tag on this question), it would likely involve setting the font on a tkinter.Label widget, or appropriately styling a ttk.Label widget. — JRiggles
– JRiggles, Commented May 24, 2024 at 17:44

Aicody · Accepted Answer · 2024-05-24 17:47:11Z

2

You can use tag_configure() and define 'bold':

import tkinter as tk

num = 2024
roman = "MMXXIV"
explanation = ["some text", "some other text"]


root = tk.Tk()

T = tk.Text(root, wrap='word', width=100, height=20)
T.pack(padx=50, pady=50)

T.tag_configure('bold', font=('Arial', 20, 'bold'))
T.insert('1.0', f"{num} is ", 'bold')
T.insert('end', f"{roman} ", 'bold')
T.insert('end', " + ".join(explanation))

root.mainloop()

Prints

answered May 24, 2024 at 17:47

Aicody

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2 Comments

Adenosine Triphosphate Over a year ago

Just some extra information:

label = tkinter.Label(Window, text="This is Bold, Italic, Underlined and Overstriked Arial Font at 8 pixels.", font=("Arial", 8, "bold italic underlined overstriked"))

There are two options for weight of the font, bold and normal and for slant, roman and italic.

aarondn Over a year ago

Thanks a lot it worked, i used 'regular' for the customization of the rest.

Gabriel Whitehair · Accepted Answer · 2024-05-24 18:46:01Z

1

If you are doing html output you can do this ( might work too):

explanation_text = f"<b>{original_number}</b> is <b>{roman_number}</b> in Roman numerals:\n\n" + " + ".join(explanation)

If you are in the terminal you can try this:

explanation_text = f"\033[1m{original_number}\033[0m is \033[1m{roman_number}\033[0m in Roman numerals:\n\n" + " + ".join(explanation)

I know you already tried this but it might be worth copying and pasting to make sure you didn't make a simple syntax error. Here is another page on this topic: How does one output bold text in Bash?

It might be worthwile to clarify where you are trying to print the text (Bash, Powershell, HTML, etc.). Good luck!

answered May 24, 2024 at 18:46

Gabriel Whitehair

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1 Comment

aarondn Over a year ago

I am trying to print the text within Tkinter, I'm using the Text widget. \033[1m doesn't work i do not know why. someone said it doesn't work on the last python version. but i tried tag_configure() and it worked, thanks.

ZenHombre · Accepted Answer · 2024-05-24 18:52:27Z

0

Make sure to use the end termination '\033[0m' with what you tried like so

print('\033[1m' + 'Hello, World!' + '\033[0m')

answered May 24, 2024 at 18:52

ZenHombre

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