python如何向一个文件追加内容_python以追加模式向文件写入内容

with open("my_file.txt", "a") as file:
    file.write("This is the new content to be appended.\n")

with open("my_file.txt", "a", encoding="utf-8") as file:
    file.write("这次追加的内容是中文。\n")

writelines()

data = ["Line 1\n", "Line 2\n", "Line 3\n"]
with open("my_file.txt", "a", encoding="utf-8") as file:
    file.writelines(data)

writelines()

write()

with open("non_existent_file.txt", "a") as file:
    file.write("This file didn't exist before!\n")

non_existent_file.txt

\n

with open("my_file.txt", "a") as file:
    file.write("This is a new line.\n")
    file.write("And another line.\n")

fcntl

portalocker

import portalocker

try:
    with open("my_file.txt", "a") as file:
        portalocker.lock(file, portalocker.LOCK_EX) # 加独占锁
        file.write("This content is written with a lock.\n")
        portalocker.unlock(file) # 解锁
except portalocker.LockException:
    print("File is locked by another process.")

portalocker

with open("image.jpg", "ab") as file:
    file.write(binary_data)

binary_data

bytes

bytes

file.flush()

with open("my_file.txt", "a") as file:
    file.write("This needs to be written immediately.\n")
    file.flush()

flush()

flush()

try...except

try:
    with open("my_file.txt", "a") as file:
        file.write("Trying to write something.\n")
except IOError as e:
    print(f"An error occurred: {e}")