[SOLVED] From string to float python

Issue

I want to make a code to read files that contain data from a sensor. I got stuck at the start:

    import numpy as np

a = []
b = []
x = []
y = []
for line in open("YAZID.txt", "r"):
    lines = [i for i in line.split()]
    print(lines)
    a.append(float(lines[0]))
    b.append(float(lines[1]))
for i in a:
    i = float(i)
    x.append(i)
print(x)

it gives me this error

    ['0,375', '7,84E-02']
Traceback (most recent call last):
  File "c:\Users\pc orange\Desktop\graphs\graph.py", line 32, in <module>
    a.append(float(lines[0]))
ValueError: could not convert string to float: '0,375'

they get stuck at being strings

is there a way to make them into float so that i can make a plot with them the numbers are really little and i need to read the whole number each time

Solution

You can replace that , with . and then try the same thing. Here’s the code:

for line in open("YAZID.txt", "r"):
    lines = [i for i in line.split()]
    print(lines)
    a.append(float(lines[0].replace(",",".")))
    b.append(float(lines[1].replace(",",".")))

Doing this should work for you.

And additionally at last you don’t have to make that float again, doing just this is okay.

for i in a:
    x.append(i)
print(x)

Answered By – Xitiz

Answer Checked By – Jay B. (BugsFixing Admin)