Python屏蔽输出信息如何屏蔽多线程程序的混杂输出 Python屏蔽输出信息的多线程输出管控技巧​

sys.stdout

/dev/null

NUL

import os
import sys
import threading
import time

def worker_with_print(name):
    print(f"线程 {name}: 正在执行任务...")
    time.sleep(0.1)
    print(f"线程 {name}: 任务完成。")

def redirect_stdout_to_devnull_example():
    original_stdout = sys.stdout
    try:
        with open(os.devnull, 'w') as fnull:
            sys.stdout = fnull
            print("这条信息不会显示在控制台。") # 这条信息会被吞掉
            threads = []
            for i in range(3):
                t = threading.Thread(target=worker_with_print, args=(f"T{i}",))
                threads.append(t)
                t.start()
            for t in threads:
                t.join()
    finally:
        sys.stdout = original_stdout # 确保恢复标准输出
    print("重定向已恢复，这条信息会显示。")

# 运行示例：
# redirect_stdout_to_devnull_example()

io.StringIO

import io

def capture_stdout_example():
    old_stdout = sys.stdout
    redirected_output = io.StringIO()
    sys.stdout = redirected_output
    try:
        print("这条信息会被捕获。")
        print("还有这条。")
        threads = []
        for i in range(2):
            t = threading.Thread(target=worker_with_print, args=(f"CaptT{i}",))
            threads.append(t)
            t.start()
        for t in threads:
            t.join()
    finally:
        sys.stdout = old_stdout # 恢复
    captured_string = redirected_output.getvalue()
    print("\n--- 捕获到的输出 ---")
    print(captured_string)
    print("--- 捕获结束 ---")

# 运行示例：
# capture_stdout_example()

import contextlib

@contextlib.contextmanager
def suppress_stdout():
    old_stdout = sys.stdout
    with open(os.devnull, 'w') as fnull:
        sys.stdout = fnull
        try:
            yield
        finally:
            sys.stdout = old_stdout

@contextlib.contextmanager
def capture_stdout_context():
    old_stdout = sys.stdout
    redirected_output = io.StringIO()
    sys.stdout = redirected_output
    try:
        yield redirected_output
    finally:
        sys.stdout = old_stdout

# 使用上下文管理器示例：
# print("正常输出开始")
# with suppress_stdout():
#     print("这段不会显示")
#     threads = []
#     for i in range(2):
#         t = threading.Thread(target=worker_with_print, args=(f"