I noticed that when I type int(0.9) it becomes 0 instead of 1.
I was just wondering why Python wouldn't round the numbers.
Asked
Active
Viewed 2,000 times
1
GhostCat
- 137,827
- 25
- 176
- 248
-
It simply takes the integer value of the number. I guess because it a simpler calculation than round, and in my opinion less ambiguous. – Jože Ws May 27 '17 at 19:00
-
1The behaviour is [documented](https://docs.python.org/2/library/functions.html#int) – Michael Foukarakis May 27 '17 at 19:01
4 Answers
3
int does not perform rounding in the way you expect, it rounds to 0, the round function will round to the nearest whole number or places you provide.
>>> int(0.9)
0
>>> int(-0.9)
0
>>> round(12.57)
13
>>> round(12.57, 1)
12.6
Nick is tired
- 6,860
- 20
- 39
- 51
2
If you use int function, it ignores decimal points and gives you integer part. So use round function if you want to round figures.
Jay Parikh
- 2,419
- 17
- 13
2
If x is floating point, the conversion truncates towards zero.
Source: docs.
Brad Solomon
- 38,521
- 31
- 149
- 235
2
Simple: because int() works as "floor" , it simply cuts of instead of doing rounding. Or as "ceil" for negative values.
You want to use the round() function instead.
GhostCat
- 137,827
- 25
- 176
- 248
-
-
@NickA: It behaves like `floor` for positive inputs and `ceil` for negative inputs. – Mark Dickinson May 27 '17 at 19:03
-
1Thanks. And fixed. This is one of the few occasions where my knowledge of the English language keeps falling apart regularly. No idea why... – GhostCat May 27 '17 at 19:04