Python实现文件备份

# -*- encoding: utf-8 -*- """ @File : backup_test.py @Time : 2020/10/19 16:56 @Author : XUDA @Email : gudianpai@qq.com @Software: PyCharm """ import os import os.path class FileBackup(object): """ 文本文件备份 """ def __init__(self, src, dist): """ 构造方法 :param src:目录 需要备份的文件目录 :param dist:目录 备份后的目录 """ self.src = src self.dist = dist def read_files(self): """ 读取src目录下的所有文件 :return: """ ls = os.listdir(self.src) print(ls) for l in ls: #self.backup_file(l) self.backup_file_Optimized_Edition(l) def backup_file(self, file_name): """ 处理备份 :param file_name:文件/文件夹的名称 :return: """ # 1. 判断dist是否存在，如果不存在，要创建这个目录 if not os.path.exists(self.dist): os.makedirs(self.dist) print('指定目录不存在，创建完成') # 2. 判断文件是否为我们要备份的文件，可以借助后缀名进行判断 # 拼接文件的完整路径 full_src_path = os.path.join(self.src, file_name) full_dist_path = os.path.join(self.dist, file_name) # 首先要判断是否为文件，然后借助文件的后缀名进行判断 if os.path.isfile(full_src_path) and os.path.splitext(full_src_path)[-1].lower() == '.txt': print(full_src_path) # 3. 读取文件内容 with open(full_dist_path, 'w', encoding='utf-8') as f_dist: print('>>开始备份【{0}】'.format(file_name)) with open(full_src_path, 'r', encoding='utf-8') as f_src: while True: rest = f_src.read(100) if not rest: break # 4. 把读取到的内容写入到新的文件中 f_dist.write(rest) f_dist.flush() print('>>【{0}】备份完成'.format(file_name)) else: print("文件类型不符合备份要求,跳过>>") # def main(): # # 要备份的文件目录地址 # # src_path = 'E:\\py-learn\\chapter04\\src' # # # 备份后的目录地址 # # dist_path = 'E:\\py-learn\\chapter04\\dist' # # 当前代码的目录名称 # # E:\py-learn\chapter04\backup_test.py # base_path = os.path.dirname(os.path.abspath(__file__)) # # 要备份的目录地址 # src_path = os.path.join(base_path, 'src') # # 备份后的目录地址 # dist_path = os.path.join(base_path, 'dist') # # print(src_path) # print(dist_path) # bak = FileBackup(src_path, dist_path) # bak.read_files() def backup_file_Optimized_Edition(self, file_name): """ 处理备份-优化 :param file_name:文件/文件夹的名称 :return: """ """ 处理备份 :param file_name:文件/文件夹的名称 :return: """ # 1. 判断dist是否存在，如果不存在，要创建这个目录 if not os.path.exists(self.dist): os.makedirs(self.dist) print('指定目录不存在，创建完成') # 2. 判断文件是否为我们要备份的文件，可以借助后缀名进行判断 # 拼接文件的完整路径 full_src_path = os.path.join(self.src, file_name) full_dist_path = os.path.join(self.dist, file_name) # 首先要判断是否为文件，然后借助文件的后缀名进行判断 if os.path.isfile(full_src_path) and os.path.splitext(full_src_path)[-1].lower() == '.txt': print(full_src_path) # 3. 读取文件内容 with open(full_dist_path, 'w', encoding='utf-8') as f_dist,\ open(full_src_path, 'r', encoding='utf-8') as f_src: print('>>开始备份【{0}】'.format(file_name)) while True: rest = f_src.read(100) if not rest: break # 4. 把读取到的内容写入到新的文件中 f_dist.write(rest) f_dist.flush() print('>>【{0}】备份完成'.format(file_name)) else: print("文件类型不符合备份要求,跳过>>") def main(): base_path = os.path.dirname(os.path.abspath(__file__)) # 要备份的目录地址 src_path = os.path.join(base_path, 'src') # 备份后的目录地址 dist_path = os.path.join(base_path, 'dist') bak = FileBackup(src_path, dist_path) # 不是函数，而是对类的初始化 bak.read_files() # 这个是调用的函数 if __name__ == '__main__': main() """ 遇到的bug Traceback (most recent call last): File "E:/py-learn/chapter07/backup_test.py", line 94, in <module> bak.read_files() File "E:/py-learn/chapter07/backup_test.py", line 32, in read_files self.backup_file(l) File "E:/py-learn/chapter07/backup_test.py", line 52, in backup_file with open(full_dist_path, 'r', encoding='utf-8') as f_dist: FileNotFoundError: [Errno 2] No such file or directory: 'E:\\py-learn\\chapter07\\dist\\file1.txt' """ # 55行 读写模式书写错误 应该 r>>>w