I have a floating point variable i.e.
123.456
how can I extract 12 ?
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3Is that the left-most 2 characters or is that the 10's and 100's place numerically?S.Lott– S.Lott2011-01-07 15:59:02 +00:00Commented Jan 7, 2011 at 15:59
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3 Answers
If you render the float as a string, then you can just index the digits you like:
str(123.456)[:2]
"proof" in shell:
>>> str(123.456)[:2]
'12'
>>>
1 Comment
user228137
thanks. int(str(123.456)[:2] is exactly what I was looking for
If you want to do it a "mathy" way, you could also divide by 1e<number of digits to strip>. For example:
>>> int(123.456 / 1e1) # 1e1 == 10 12 >>> int(123.456 / 1e2) # 1e2 == 100 1 >>> int(123.456 / 1e-1) # 1e-1 == 0.1 1234
This will be much faster than converting float -> string -> int, but will not always behave exactly the same way as the string method above (eg, int(1.2 / 1e1) will be 0, not '1.').
Comments
- result as float:
123.456//10
# res: 12.0
- result as integer
int(123.456)//10
# res: 12
- res as string: you have to care about the position of
.!
str(123.456)[:2]
# res: "12"
