[Python]小甲鱼Python视频第030课(文件系统:介绍一个高大上的东西)课后题及参考解答
# -*- coding: utf-8 -*- """ Created on Fri Mar 8 15:49:32 2019 @author: Administrator """ """ 动动手: 0. 编写一个程序,统计当前目录下每个文件类型的文件数,程序实现如图: 1. 编写一个程序,计算当前文件夹下所有文件的大小,程序实现如图 2. 编写一个程序,用户输入文件名以及开始搜索的路径,搜索该文件是否存在。如遇到文件夹,则进入文件夹继续搜索,程序实现如图 3. 编写一个程序,用户输入开始搜索的路径,查找该路径下(包含子文件夹内)所有的视频格式文件(要求查找mp4 rmvb, avi的格式即可),并把创建一个文件(vedioList.txt)存放所有找到的文件的路径,程序实现如图: 4. 编写一个程序,用户输入关键字,查找当前文件夹内(如果当前文件夹内包含文件夹,则进入文件夹继续搜索)所有含有该关键字的文本文件(.txt后缀),要求显示该文件所在的位置以及关键字在文件中的具体位置(第几行第几个字符),程序实现如图: """ import os #动动手0 def count_file_format_num(): file_folder = "F:\\drink_c_02010121\\test9"; result_dict = dict(); result_dict['无后缀名文件'] = 0 result_dict['文件夹'] = 0 filelist = os.listdir(file_folder); for each in filelist: each_full_name = file_folder+'\\'+each if os.path.isfile(each_full_name): if '.' in each: file_name = each.split('.'); if file_name[-1] in result_dict.keys(): result_dict[file_name[-1]] += 1; else: result_dict[file_name[-1]] = 1; else: result_dict['无后缀名文件'] +=1; else: result_dict['文件夹'] +=1; print(' [%s] 中共有[%d]类文件' % (file_folder,len(result_dict.keys()))) for key in result_dict.keys(): print("该文件夹下共有类型为【%s】的文件【%d】个" % ('.'+key,result_dict[key])) #动动手1 def get_file_size(): file_folder = "F:\\drink_c_02010121\\test9\\"; result_dict = dict(); filelist = os.listdir(file_folder); for each in filelist: each_file_full_name = file_folder + os.sep + each; result_dict[each] = os.path.getsize(each_file_full_name) for key in result_dict.keys(): print('%s 【%dBytes】' % (key,result_dict[key])); #动动手2: def find_file_in_dir(folder_path,target_file_name): filelist = os.listdir(folder_path) for each in filelist: #each_full_name = folder_path +'\\'+ each each_full_name = folder_path + os.sep + each; if each == target_file_name and os.path.isfile(each_full_name): print(each_full_name) if os.path.isdir(each_full_name): find_file_in_dir(each_full_name,target_file_name) #folder_path = input('请输入待查找的初始目录:') #target_file_name = input('请输入需要查找的目标文件:') #find_file_in_dir(folder_path,target_file_name) #动动手3 #非递归方式,只能到本层和下一层 def get_spec_file_num(): file_folder = "F:\\drink_c_02010121\\test9" result_list = list(); filelist = os.listdir(file_folder) valid_suffix = ['rar','h']; for each in filelist: if os.path.isdir(file_folder+'\\'+each): sub_file_folder = file_folder +'\\' + each; sub_file_list = os.listdir(sub_file_folder) for sub_each in sub_file_list: filename = sub_each.split('.'); if len(filename) >=2 and filename[-1] in valid_suffix: result_list.append(sub_file_folder+'\\'+sub_each); else: filename = each.split('.'); if len(filename) >= 2 and filename[-1] in valid_suffix: result_list.append(file_folder+'\\'+each); f_out = open('file_list.txt','w'); for each in result_list: f_out.writelines(each+'\n'); f_out.close(); #递归方式,递归遍历子文件夹 result_list = list() valid_suffix = ['rar','h']; def get_spec_file_num_res( folder_path ): global result_list global valid_suffix filelist = os.listdir(folder_path) for each in filelist: if os.path.isdir(folder_path+'\\'+each): get_spec_file_num_res(folder_path+'\\'+each); else: filename = each.split('.'); if len(filename) >= 2 and filename[-1] in valid_suffix: result_list.append(folder_path+'\\'+each); #动动手4: #0.遍历文件夹获得以.txt结尾的文件 #1.获取.txt文件的内容,获取关键字的存在与否的信息并打印出来 def get_key_word_info_of_txt_file( folder_path,key_word): file_list = os.listdir(folder_path); for each in file_list: each_full_name = folder_path + '\\' + each if os.path.isdir(each_full_name): get_key_word_info_of_txt_file(each_full_name,key_word) elif each.endswith('.txt') and os.path.isfile(each_full_name): file_obj = open(each_full_name,'r') file_valid = 0; lines_count = 0; for each_line in file_obj: lines_count += 1; locs = []; #lines = []; str_count = each_line.count(key_word); index = 0; while str_count!=0: index = each_line.find(key_word,index) locs.append(index); index = index + 1; str_count -= 1; if len(locs)!=0: file_valid = 1 if file_valid == 0 else 2; if file_valid == 1: print('文件【%s】中出现关键字【%s】:' % (each_full_name,key_word)) print('关键字【%s】出现在 %d 行,第%s 个位置' %(key_word,lines_count,locs)); file_obj.close() get_key_word_info_of_txt_file( 'C:\\Users\\fengs\Desktop\\SVN_TEST\\Python\\小甲鱼课后题\\测试文件夹','1') #count_file_format_num() #get_file_size() #get_spec_file_num_res('F:\\drink_c_02010121\\test9') #for each in result_list: # print(each) """ 需要注意的问题: 1. 目录分隔符可以用python提供的 os.sep 来代替,以适应不同的操作系统 2. 我的代码都是用的绝对路径,所以不存在切换目录的问题 3. 若要用相对路径,相关的常量: os.curdir -----> 当前目录 os.sep -----> 目录分隔符 os.chdir() -----> 切换工作目录 os.pardir -----> 当前工作目录的上一层目录 os.getcwd() -----> 当前工作目录的绝对路径 """
~不再更新,都不让我写公式,博客园太拉胯了