Long integers with underscore in Python

Long integers with underscore in Python

Long Integers with Underscorelink image 1

Disclaimer: This post has been translated to English using a machine translation model. Please, let me know if you find any mistakes.

If we have a very long integer, it may be hard to read it

	

		

			< >
			Input
		

		

			Python
			
		

	

	

		
num = 1000000000000
print(num)

	

	
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>_ Output 
			

				
1000000000000

But Python allows us to use underscores to separate the digits and make it more readable

	

		

			< >
			Input
		

		

			Python
			
		

	

	

		
num_ = 1_000_000_000_000
print(num_)

	

	
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>_ Output 
			

				
1000000000000

Let's check that both numbers are equal

	

		

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			Input
		

		

			Python
			
		

	

	

		
num == num_

	

	
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>_ Output 
			

				
True

Frequently asked questions

Do underscores in an integer literal like 1_000_000_000_000 change its value in Python?

No. The underscore is purely a visual separator that Python ignores when parsing the numeric literal; 1_000_000_000_000 == 1000000000000 evaluates to True, so both expressions represent exactly the same integer — the int type and stored value are unaffected.

Since which Python version can you use underscores as thousand separators in integer literals?

This syntax was introduced in Python 3.6 via PEP 515, "Underscores in Numeric Literals." Before that version, writing num_ = 1_000_000_000_000 raised a SyntaxError; from Python 3.6 onward the interpreter simply discards the underscores while parsing the literal, as confirmed by num == num_ returning True in the example.

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