使用 Python 编写文件时换行符 (\n) 重复？

Question

I'm writing a simple program that sends bytes to a server (UDP connection), the server echoes the bytes back, and then I write the echo on an output file. The main functions are these:

def communication_into_server(s, size, filename):
    f = open(filename, 'rb')
    while True:
        line = f.read(size)
        if line == b'':
            break
        s.send(line)
    f.close()
    s.send(b"EOF")

def communication_from_server(s, size):
    g = open("output.txt", 'w', encoding="utf-8")
    while True:
        line = s.recv(size)
        print(line.decode("utf-8"))
        if line == b'EOF':
            break
        g.write(line.decode("utf-8"))
    g.close()

Some sample text is this:

This is some sample text
with a single newline character.

and its output looks like this:

This is some sample text

with a single newline character.

Apparently, \n characters are being duplicated somewhere. Note the print() on the second function. It prints this:

This is some sample text
with a single newline character.

without the extra newline character, so the problem doesn't appear to be in the connection. If I change 'w' to 'a' while opening the output file, nothing changes. What am I missing?

Answer 1

I had the same problem, saving markdown files using python, and the spaces were being duplicated on each save. I simply encoded the string before saving it in a file using the encode method:

body = body.encode()
# now it can be saved into a file...