如何用contextlib.suppress优雅忽略文件不存在的FileNotFoundError？

import contextlib
import os

def process_file(filename):
    with contextlib.suppress(FileNotFoundError):
        with open(filename, 'r') as f:
            content = f.read()
            print(f"Processing {filename}: {content[:50]}...") # 只打印前50个字符
    print(f"Finished processing {filename} (if it existed).")

process_file("existing_file.txt") # 假设存在
process_file("non_existent_file.txt") # 假设不存在

import os

def process_file_with_fallback(filename):
    try:
        with open(filename, 'r') as f:
            content = f.read()
            print(f"Processing {filename}: {content[:50]}...")
    except FileNotFoundError:
        print(f"File {filename} not found. Using default settings.")
        # 在这里执行默认操作，例如加载默认配置文件
        # default_settings = load_default_settings()
        # process_data(default_settings)
        pass
    print(f"Finished processing {filename}.")

process_file_with_fallback("existing_file.txt")
process_file_with_fallback("non_existent_file.txt")

import contextlib
import logging

class SuppressAndLog(contextlib.suppress):
    def __init__(self, *exceptions, logger=None, message="Suppressed exception: {}"):
        super().__init__(*exceptions)
        self.logger = logger or logging.getLogger(__name__)
        self.message = message

    def __exit__(self, exc_type, exc_value, traceback):
        if exc_type is not None and issubclass(exc_type, self.__suppressed):
            self.logger.warning(self.message.format(exc_value))
            return True # Suppress the exception

# 配置日志
logging.basicConfig(level=logging.WARNING)

def process_file_with_logging(filename):
    with SuppressAndLog(FileNotFoundError, logger=logging.getLogger(), message="File not found: {}"):
        with open(filename, 'r') as f:
            content = f.read()
            print(f"Processing {filename}: {content[:50]}...")
    print(f"Finished processing {filename} (if it existed).")

process_file_with_logging("existing_file.txt")
process_file_with_logging("non_existent_file.txt")