文件哈希计算脚本出现FileNotFoundError问题求助

使用Python脚本计算目录中所有文件的哈希值时，部分随机文件会抛出FileNotFoundError: [Errno 2] No such file or directory错误。已使用文件夹绝对路径，脚本曾成功处理20个文件夹共约100GB的文件，说明脚本逻辑本身可用。出错的文件名无异常（例如title65name77.dwg），文件非空且可在对应程序中正常打开。

原脚本 #

import csv
import hashlib
import os

folder_path = input('What folder do you want to get hashes from? ')
output_file = input('What do you want the output CSV file to be named? (include .csv at the end of the file name)')

# Generate hashes of files
def hash_file(file_path):
    hasher = hashlib.sha256()
    with open(file_path, 'rb') as f:
        for chunk in iter(lambda: f.read(4096), b''):
            hasher.update(chunk)
    return hasher.hexdigest()

# Record hashes & filepaths
def record_hashes(folder_path, output_file):
    hashes = {}
    for root, _, files in os.walk(folder_path):
        for file in files:
            file_path = os.path.join(root, file)
            file_hash = hash_file(file_path)
            hashes[file_path] = file_hash

    # Write hashes and file paths to a CSV file
    with open(output_file, 'w', newline='') as f:
        writer = csv.writer(f)
        writer.writerow(['File Path', 'Hash'])
        for file_path, file_hash in hashes.items():
            writer.writerow([file_path, file_hash])

record_hashes(folder_path, output_file)

print("Done recording hashes of files in", folder_path)

• 添加文件存在性校验：os.walk遍历到文件后，到实际读取前，文件可能被删除、移动或重命名，导致路径失效。在处理前先检查文件是否存在且为普通文件，排除符号链接、临时文件等特殊情况。
• 单个文件异常捕获：对每个文件的哈希计算过程添加异常捕获，避免单个文件出错导致整个脚本终止，同时记录错误信息便于排查。
• 区分不同错误类型：将不存在、权限不足、读取失败等错误分类记录，方便后续定位问题。

修改后的脚本 #

import csv
import hashlib
import os

folder_path = input('请输入要计算哈希值的文件夹路径：')
output_file = input('请输入输出CSV文件名（需包含.csv后缀）：')
error_log = output_file.replace('.csv', '_errors.csv')  # 自动生成错误日志文件名

def hash_file(file_path):
    hasher = hashlib.sha256()
    try:
        with open(file_path, 'rb') as f:
            for chunk in iter(lambda: f.read(4096), b''):
                hasher.update(chunk)
        return hasher.hexdigest(), None
    except Exception as e:
        return None, str(e)

def record_hashes(folder_path, output_file, error_log):
    hashes = []
    errors = []
    for root, _, files in os.walk(folder_path):
        for file in files:
            file_path = os.path.join(root, file)
            # 先校验文件状态
            if not os.path.exists(file_path):
                errors.append([file_path, '文件不存在'])
                continue
            if not os.path.isfile(file_path):
                errors.append([file_path, '非普通文件（如目录、符号链接）'])
                continue
            # 计算哈希并处理异常
            file_hash, err_msg = hash_file(file_path)
            if file_hash:
                hashes.append([file_path, file_hash])
            else:
                errors.append([file_path, err_msg])

    # 写入正常结果到CSV
    with open(output_file, 'w', newline='', encoding='utf-8') as f:
        writer = csv.writer(f)
        writer.writerow(['文件路径', 'SHA256哈希值'])
        writer.writerows(hashes)

    # 写入错误日志（如果有错误）
    if errors:
        with open(error_log, 'w', newline='', encoding='utf-8') as f:
            writer = csv.writer(f)
            writer.writerow(['文件路径', '错误信息'])
            writer.writerows(errors)
        print(f"处理完成：成功计算 {len(hashes)} 个文件的哈希值，{len(errors)} 个文件出错，详情见 {error_log}")
    else:
        print(f"处理完成：所有 {len(hashes)} 个文件的哈希值已计算并写入 {output_file}")

record_hashes(folder_path, output_file, error_log)

内容的提问来源于stack exchange，提问作者Tanner