Convert int value in txt file to float

Question

I have txt file like this f1= 255,216,255,224,0,16,74,70,73,70,0,1,1,1,0,0,0,0,0,0,255,219,0 I need to convert these numbers to float and save in f2( f2 contain the converted float values) how can do that?

You'd start by breaking there problem into smaller bits, then with some basic research — Mad Physicist, Oct 31 '21 at 15:10
Please provide a [mcve] after reading [ask]. If you want text output, the file already contains valid floats as far as python is concerned. Otherwise you need to be much more specific — Mad Physicist, Oct 31 '21 at 15:14
So, just to be clear, do you expect the output in f2 to be `255.0,216.0,...`? — joanis, Oct 31 '21 at 15:29

user107511 · Accepted Answer · 2021-10-31T15:08:43.177

0

Assuming input is correct, using list comprehension:

with open(file_path, "r") as f_r:
    num_strs = f_r.read().split(",")
    num_floats = [float(x) for x in num_strs]

And if you want to write the output in a file:

separator = ","
with open(file_path, "w") as f_w:
    f_w.write(separator.join([str(x) for x in num_floats]))

This will write the default string representation of floats to file If you want also to format the floats (set precision for example):

separator = ","
with open(file_path, "w") as f_w:
    f_w.write(separator.join([f"{x:.2f}" for x in num_floats]))

edited Oct 31 '21 at 15:08

answered Oct 31 '21 at 15:02

user107511

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thanks a lot, how can write the output in file? – lena Oct 31 '21 at 15:04
Added to answer – user107511 Oct 31 '21 at 15:09
I have one value in each raw, how can update on this code please? – lena Feb 04 '22 at 14:55
@oleva just change the separator to a new line in both split and join – user107511 Feb 05 '22 at 21:00

score 0 · Answer 2 · answered Oct 31 '21 at 15:08

0

import numpy as np
numbers = np.loadtxt("file.txt",  delimiter=",")
#It should parse it as float64 already, but just in case:
numbers=np.float64(numbers)
with open("file2.txt", "w") as txt_file:
    for number in numbers:
        txt_file.write("".join(str(number)) + ",")

answered Oct 31 '21 at 15:08

Toby

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3

Why bother with numpy if you aren't going to use it's features? – Mad Physicist Oct 31 '21 at 15:13
He said he needed it in a "float array" for the intermediate part, which I assumed by "array" he meant "np.array". He edited the question just now. Look at the question history. – Toby Oct 31 '21 at 15:15
How can make float number like .00000 instead of .0 ? – lena Feb 04 '22 at 15:02

Bharel · Answer 3 · 2021-10-31T17:36:06.657

-1

I wrote a one-liner :D

import pathlib

# Read the text file, split it by commas, then convert all items to floats
output = list(map(float, pathlib.Path("file.txt").read_text().split(",")))

edited Oct 31 '21 at 17:36

answered Oct 31 '21 at 15:02

Bharel

23,672
5
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80

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You also appear to have missed a major part of the question. Please add prose in addition to a code dump if you believe this answers the question. – Mad Physicist Oct 31 '21 at 15:11
@MadPhysicist The OP seems to have modified his original question and changed his output requirements. – Bharel Oct 31 '21 at 17:36

Convert int value in txt file to float

3 Answers3