如何将列表写入文件？

Question

how to write a list with elements with words from different languages and with numbers to a file?

s = ['привет', 'hi', 235, 235, 45]

with open('test.txt', 'wb') as f:
    f.write(s)

TypeError: a bytes-like object is required, not 'list'

Answer 1

Well since you are opening a .txt file and you mentioned different languages, I will assume that you want to write to a .txt file some values with different encoding.

( If that's not the case and you want to write binary, you can check the answers above )

You should specify the encoding for the file depending on the values you have.

s = ['привет', 'hi', 235, 235, 45]

with open("filename.txt", "w", encoding="utf-8") as f:
    f.write("\n".join(str(val) for val in s))

Answer 2

with open('filename.txt', 'w') as file:
    file.write(', '.join([str(item) for item in s]))

It writes every item in a list (first changing every item to a string of course) separated by a comma.

Answer 3

Maybe convert (parse) to json string
Like this:

import json

dataList = ["po", "op", "oo"]
dataJson = json.dumps(dataList)
# Then your code
# with open('test.txt', 'wb') as f: f.write(dataJson) 

Answer 4

Using 'wb' to open the file causes you to write in binary mode. I'm not sure if this is what you want, since you are writing to a .txt file.

If you are sure you want to write in binary mode, I would suggest you use .bin or .dat as the file extension for your file.

If you are sure you want to write the output as binary, here is one way to do so (I make several assumptions here, because you don't give details in your question):

import sys

s = ['привет', 'hi', 235, 235, 45]

# Create an empty bytearray
byte_array = bytearray()

# For each item in the list s, convert it to a bytearray, and append it to the
# output bytearray
for item in s:
    if isinstance(item, str):
        byte_array.extend(bytearray(item, 'utf-8'))
    elif isinstance(item, int):
        # Assumption: all ints in the list can be represented with only 2 bytes
        # Assumption: we want to output with the system's byte order
        byte_array.extend(item.to_bytes(2, sys.byteorder, signed=True))

# Here I use the .bin extension, because it is a binary file
with open('test.bin', 'wb') as f:
    f.write(byte_array)

If you instead do not want to write as binary, but want to write as text, see Spiros Gkogkas's answer .