零基础入门学Python 第 30 讲 文件系统：介绍一个高大上的东西

黄金猫

注意:
1.需要用到字典,字典的用法需要多复习
2.需要用到递归,递归的用法要积累

动动手:
0.
import os

file_name = os.listdir('/Users/yufan/Documents/python编程/30/doc')
print(file_name)

txt = 0
png = 0
py = 0
docx = 0
doc = 0

for each_file in file_name:
    if '.txt' in each_file:
        txt += 1
    elif '.png' in each_file:
        png += 1
    elif '.py' in each_file:
        py += 1
    elif '.docx' in each_file:
        docx += 1
    elif '.' not in each_file:
        doc += 1

print('txt 是 %d, png 是 %d, py 是 %d, docx 是 %d, doc 是 %d' % (txt,png,py,docx,doc))

1.
import os
doc_path = '/Users/yufan/Documents/python编程/30'
file_name = os.listdir(doc_path)

file_path = []

for each_file_name in file_name:
    file_path.append(os.path.join(doc_path,each_file_name))

for each_file in file_path:
    print('文件 %s 的大小是 %d byte.' % (os.path.basename(each_file),os.path.getsize(each_file)))

2.
import os

doc_path = input('请输入待查找的初始目录:')
while not os.path.isdir(doc_path):
    doc_path = input('没有这个路径,请重新输(输入exit退出):')
    if doc_path == 'exit':
        break

file_name = input('请输入需要寻找的目标文件:')

fold = os.walk(doc_path)

flag = 0

all_file = []
for each in fold:
    for each_file_name in each[2]:
        if file_name == each_file_name:
            print(each[0] +'/'+ file_name)
        else:
            flag = 1
if flag == 1:
    print('没有这个文件噢!')

3.
import os

doc_path = input('请输入待查找的初始目录:')
while not os.path.isdir(doc_path):
    doc_path = input('输入错误,请重新输入:')

doc_walk = os.walk(doc_path)

file_path = []

for each_part in doc_walk:
    for each_file in each_part[2]:
        if '.avi' or '.mp4' or '.rmvb' in each_file.lower():
            file_path.append(os.path.join(each_part[0],each_file) + '\n' * 2)

print(file_path)

f = open('/Users/yufan/Documents/python编程/30sp/videoList.txt','w',encoding = 'GBK')
f.writelines(file_path)
f.close()

4.
import os

keyword = input('请将该代码放于待查找的文件夹内,请输入关键字:')
allow = input('请问是否需要打印关键字 *%s* 在文件夹中的位置(yes/no):' % keyword)
while allow.lower() != 'yes':
    allow = input('逗你的,输入yes吧:')

cur_doc_path = os.getcwd()

all_file = os.walk(cur_doc_path)

txt_path = []

for each_part in all_file:
    for each_file in each_part[2]:
        if '.txt' in each_file:
            txt_path.append(os.path.join(each_part[0],each_file))

for each_path in txt_path:
    count = 1
    line = []
    position = []
    f = open(each_path,encoding = 'GBK')
    for each_line in f:
        line_position = []
        if keyword in each_line:
            line.append(count)
            for each in range(len(each_line)):
                if keyword[0] == each_line[each]:
                    line_position.append(each+1)
            position.append(line_position)
        count += 1
    print('在文件*%s*中找到关键字*%s*' % (each_path,keyword))
    for each in range(len(line)):
        print('关键字出现在第 %d 行,第 ' % line[each],position[each],'个位置')