How to round off a floating number to one decimal place from the print line python function directly

Question

So I have the following code

for x in range(10):
  
    print(f'Machine Busy Val     : {read_log ("Machine_busy_value")}')

read_log is the function and it is getting the machine_busy_value. it is currently returning a floating number but I would like it to return the value in 2 decimal places. How can I go about that? Any type of suggestion would be appreciated. I am using python 2.7 if that helps

If you’re using Py2.7 (or anything <3.6) the `f-string` notation will fail in a syntax error. Are you sure you’re on 2.7? — S3DEV, Nov 26 '21 at 16:25

score 1 · Accepted Answer · answered Nov 26 '21 at 16:29

1

You might consider using format()

print ("{val:.1f}".format(val=read_log("Machine_busy_value") ))

That's python 2.7 (which doesn't have f-strings). There are plenty of questions like this already out there

If you're on python 3.7, then you can just end your read_log call in the string with the :.2f to format it.

f'Machine Busy Val     : {read_log ("Machine_busy_value"):.1f}'

answered Nov 26 '21 at 16:29

mccatnm

212
1
12

Thanks for this. The python 3.7 implementation worked. This is strange because when I type py --version on my terminal I see python 3.7.0. Not sure what is that about. Thanks for your help – Rafi Hasan Nov 26 '21 at 16:39

score 0 · Answer 2 · answered Nov 26 '21 at 16:23

0

Python has a round function which you can call as such: round(The number you want to round, The number of decimal points)

So you should save your floating number, round it then print it.

answered Nov 26 '21 at 16:23

Kookies

75
10

That was my initial plan but i was wondering is there no way to do it directly within that line of code itself? – Rafi Hasan Nov 26 '21 at 16:25
Yes, look into **string formatting**. A little research on your own will uncover the answer. – S3DEV Nov 26 '21 at 16:26
You could do: f"Machine Busy Val : {round(read_log ("Machine_busy_value"), 2)} – Kookies Nov 26 '21 at 16:27

How to round off a floating number to one decimal place from the print line python function directly

2 Answers2