Ask HN: Why does print (0.1 and 0.1 and 0.1 == 0.3) evaluate to False in Python?

#1

Post by AlexHerbert » Sat, Jan 02, 2021, 11:09 AM UTC

No post body was provided.

Re: Ask HN: Why does print (0.1 and 0.1 and 0.1 == 0.3) evaluate to False in Python?

#2

Post by edrobap » Sat, Jan 02, 2021, 11:21 AM UTC

Explanation for this behaviour is explained here - https://docs.python.org/3/library/decimal.html

Re: Ask HN: Why does print (0.1 and 0.1 and 0.1 == 0.3) evaluate to False in Python?

#3

Post by [deleted] » Sat, Jan 02, 2021, 11:40 AM UTC

[deleted]

Re: Ask HN: Why does print (0.1 and 0.1 and 0.1 == 0.3) evaluate to False in Python?

#4

Post by AlexHerbert » Sat, Jan 02, 2021, 12:30 PM UTC

edrobap wrote: post #2

Explanation for this behaviour is explained here - https://docs.python.org/3/library/decimal.html

Thank you

Re: Ask HN: Why does print (0.1 and 0.1 and 0.1 == 0.3) evaluate to False in Python?

#5

Post by asplake » Sat, Jan 02, 2021, 4:37 PM UTC

edrobap wrote: post #2

Explanation for this behaviour is explained here - https://docs.python.org/3/library/decimal.html

Floating point isn't the issue. 'and' is a logical operator here. 0.1 and 0.1 is 0.1.

Re: Ask HN: Why does print (0.1 and 0.1 and 0.1 == 0.3) evaluate to False in Python?

#6

Post by edrobap » Mon, Jan 04, 2021, 10:17 AM UTC

asplake wrote: post #5

edrobap wrote: post #2

Explanation for this behaviour is explained here - https://docs.python.org/3/library/decimal.html

Floating point isn't the issue. 'and' is a logical operator here. 0.1 and 0.1 is 0.1.

I believe author wanted to discuss addition and not logical operation. With logical operation, the question become trivial.