From string to float python

Question

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

Do a.append(float(lines[0].replace(',','.'))

user15801675
– user15801675

2021-08-04 01:14:28 +00:00
Commented Aug 4, 2021 at 1:14 — user15801675
– user15801675, Commented Aug 4, 2021 at 1:14
@Sujay I had already answer here. :)

imxitiz
– imxitiz

2021-08-04 01:15:13 +00:00
Commented Aug 4, 2021 at 1:15 — imxitiz
– imxitiz, Commented Aug 4, 2021 at 1:15
@Xitiz oh! It did not update here

user15801675
– user15801675

2021-08-04 01:17:08 +00:00
Commented Aug 4, 2021 at 1:17 — user15801675
– user15801675, Commented Aug 4, 2021 at 1:17

imxitiz · Accepted Answer · 2021-08-04 01:14:02Z

2

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 Aug 4, 2021 at 1:14

imxitiz

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Comments

Puneeth · Accepted Answer · 2021-08-04 01:13:36Z

0

string= "3.141"

print(string)
print(type(string))

# converting string to float
Float = float(string)

print(Float)
print(type(Float))

edited Aug 4, 2021 at 1:13

user15801675

answered Aug 4, 2021 at 1:11

Puneeth

1

Comments

Yazid Ziregue · Accepted Answer · 2021-08-04 03:43:10Z

0

the probleme was in my text file the comas were comas(,) not points(.) also used this code to make them into float

 x = [float(c) for c in a]

thanks everyone for your help

answered Aug 4, 2021 at 3:43

Yazid Ziregue

151 silver badge3 bronze badges

2 Comments

imxitiz Over a year ago

But your error is in a.append(float(lines[0].replace(",","."))) so this is not technically an answer! And if you follow my answer while appending in a then you don't have to do this as well. I had mentioned that too in my answer! I had already answered your full questions, I don't think you have to write a new answer, you can accept my answer and it is officially your problem solution!

Yazid Ziregue Over a year ago

i am quite new in here so i am stiill not accustumed to how it works here i used your answer and it did the job thank you

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