ValueError: could not convert string to float: '-0,274697\n'

Question

I'm now programming ecg signal with python and i have this error i dont know how i can solve it.

ValueError: could not convert string to float: '-0,274697\n'

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Please post your code **as text**, using a formatted block, into the question. Thanks. — halfer, Feb 02 '17 at 22:58
in consol i got this File "C:/Users/Imrane/Desktop/WinPython-64bit-3.5.2.3Qt5/settings/.spyder-py3/temp.py", line 121, in rateKommentar return float(datei.readline().replace('#','')) ValueError: could not convert string to float: '-0,274697\n' — Abdel, Feb 02 '17 at 22:58
Hi welcome to StackOverflow. Could you please type your code out instead of having it in a picture. Also, on which line is the error occurring. (There are multiple conversions to float in the code you have posted) — cjds, Feb 02 '17 at 23:02

cjds · Answer 1 · 2017-02-05T19:02:51.443

3

Okay, so you are trying to convert a string with a , to a floating point number.

In Python, you can't have a comma in your number, only a . is supported. To convert it, you can use these lines

 datei= open(dateiname,'r')
 dateistr = datei.readline().replace(',','.') #replacing comma with .
 dateistr = dateistr.replace('#','') # replacing # with blank
 dateistr = dateistr.strip('\n') #remove the new line character at the end
 return float(dateistr)

edited Feb 05 '17 at 19:02

answered Feb 02 '17 at 23:08

cjds

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Oops. Good catch. My mistake – cjds Feb 05 '17 at 19:02
1

you can just use `strip()` instead of `strip('\n')` - it stripes all whitespaces automatically – yedpodtrzitko Feb 05 '17 at 19:08

ValueError: could not convert string to float: '-0,274697\n'

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