Digits precision of the ".write" function?

Asked Jul 12 '21 at 15:27

Active Jul 12 '21 at 16:51

Viewed 29 times

I want to store my data in a .txt file by using the "write" function in python.

The problem is that my values are around 9 digits after the point and the "write" function truncates after only 6.

For exemple if I want to write 0.000000604 I will get into the txt file 0.000000

I didn't see any option to change this precision... Someone know how to deal with that?

Here is how I use it :

fres = open("results.dat","w")
fres.write("%f %f %f\n" % (abstime, np.mean(x), np.mean(y),0.00000005))
fres.close()

edited Jul 12 '21 at 16:51

martineau

asked Jul 12 '21 at 15:27

trial

1

https://pyformat.info – ForceBru Jul 12 '21 at 15:30
1

"0.000000604" resulted in "0.000000"? I'd expect "0.000001". – chux - Reinstate Monica Jul 12 '21 at 15:54
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The `write()` function simply writes whatever string you give it. The _string format_ step is what causes your loss of precision. – Pranav Hosangadi Jul 12 '21 at 15:54
It should not be "The problem is that my values are around 9 digits after the point", but the number of _significant digits_. Consider `%.9g`. – chux - Reinstate Monica Jul 12 '21 at 15:56

0 Answers0