ValueError：读取文件时无法将字符串转换为浮点数：''

Question

I'm trying to read each line text file with a single number on each line and convert the number into a list of integers. The test file I wrote contains these numbers:

1
23
567
4000

I use this code in my main function to read the file and write the output of my function est() into another output file.

with open(in_path, "r", encoding = "utf-8") as f_in, \
        open(out_path, "w", encoding = "utf-8") as f_out:
            for line in f_in:
                word1 = est(line)
                f_out.write(f"{line} = {est(line)}")

The error occurs when I pass the line to est() as the argument num to convert the string into the list of integers in est().

for i in num:
    num_list.append(int(float(i)))

This causes the error ValueError: could not convert string to float: ''

Answer 1

Per the comments:

with open(in_path, "r", encoding = "utf-8") as f_in, \
        open(out_path, "w", encoding = "utf-8") as f_out:
            for line in f_in:
                line = line.strip():
                if not line:
                    continue
                word1 = est(line)
                f_out.write(f"{line} = {word1}")

Should work. Here we skip blank lines, and whitespace on the line.

Answer 2

You can try to strip line first:

with open(in_path, "r", encoding = "utf-8") as f_in, \
    open(out_path, "w", encoding = "utf-8") as f_out:
        for line in f_in:
            word1 = est(line.strip())
            f_out.write(f"{line} = {est(line)}")