Convert int value in txt file to float-CodePudding

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?

CodePudding user response：

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]))

CodePudding user response：

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))   ",")

CodePudding user response：

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(",")))