os模块及os.path模块的应用举例

1. 获取当前目录下所有文件类型的统计及文件夹统计

import os

list_all = os.listdir(os.curdir)#os.curdir表示当前目录更准确,listdir返回目录所有文件及文件夹的目录列表

sum_dict = dict()
#生产一个空字典

for each in list_all:

if os.path.isdir(each):

sum_dict.setdefault('文件夹',0)

sum_dict['文件夹']  += 1#字典键值取法

else:

ext = os.path.splitext(each)[1]

sum_dict.setdefault(ext,0)

sum_dict[ext] += 1

for eachtype in sum_dict.keys():

print('该目录下共有类型[%s]的文件数量%d个'%(eachtype, sum_dict[eachtype]))

2.在某个目录及子目录中查找某个文件

def search_file(start_dir, target):

os.chdir(start_dir)

list_dir = os.listdir(os.curdir)#获取目录文件列表

for each in list_dir:

if each == target:

print(os.getcwd() + os.seq + each)#找到文件则打印

if  os.path.isdir(each):#如果是文件夹则递归调用

search_file(each, target)

os.chdir(os.pardir)

start_dir = input('请输入要开始查找的目录:')

target = input('请输入要查找的文件名:')

search_file(start_dir, target)

3.在指定的目录及子目录下查找指定后缀名的文件

def search_ext(start_dir, target):

os.chdir(start_dir)

list_dir = os.listdir(os.curdir)#获取目录文件列表

for each in list_dir:

ext = os.path.splitext(each)[1]

if each in target:

find_list.append(os.getcwd() + os.seq + each + os.lineseq)#添加到列表

if  os.path.isdir(each):#如果是文件夹则递归调用

search_file(each, target)

os.chdir(os.pardir)

start_dir = input('请输入要开始查找的目录:')

target = ['.mp4', '.avi', '.rmvb']

find_list = []

search_file(start_dir, target)

f = open(os.getcwd() + os.seq + 'vediolist.txt', 'w')

f.writeline(find_list)

f.close()

4.在当前目录及子目录中的某种类型文件中查找指定的关键字

import os

#=========打印结果=========

def print_pos(key_dict):

keys = key_dict.key()#分离字典的key

keys = sorted(keys)#排序

for each_key in keys:

print('关键字在第 %s 行的第 %s 位置'%(each_key, str(key_dict[each_kkey])))

#========在某行查找关键字==========

def pos_in_line(line, key):

pos = []

begin = line.find(key)

while begin != -1:#在行中找到了

pos.append[begin + 1]

begin = line.find(key, begin + 1)

return pos

#==========在文件中查找==========

def search_in_file(filename, key):

f = open(filename)

count = 0#记录行数

key_dict = dict()

for each_line in f:

count += 1

if key in each_line:

pos = pos_in_line(each_line, key)

key_dict[count] = pos

f.close()

return key_dict

#==========主程序(在目录中查找)==========

def search_key(key, isprt):

all_file = os.walk(os.getcwd())#返回一个三目的元组('路径',[路径包含目录],[路径包含文件])

txt_file = []#定义空列表

for sch in all_file:

for each in sch[2]:

if os.path.splitext(each)[1] == '.txt':

each = os.path.join(i[0], each)#合并路径和文件名

txt_file.append(each)

for each_txt_file in txt_file:

key_dict = search_in_file(each_txt_file, key)

if key_dict:

print('=======================================')

print('在文件%s中找到 %s关键字'%(each_txt_file, ke))

if detail in['YES', 'Yes', '阳台']:

print_pos(key_dict)

key = input('请将给脚本放置到要查找的目录,然后输入要查找关键字:')

detail = input('是否打印关键字%s的位置(YES/NO)'%key)

search_file(key,detail)

import os
#=========打印结果=========
def print_pos(key_dict):
keys = key_dict.key()#分离字典的key
keys = sorted(keys)#排序
for each_key in keys:
print('关键字在第 %s 行的第 %s 位置'%(each_key, str(key_dict[each_kkey])))

#========在某行查找关键字==========
def pos_in_line(line, key):
pos = []
begin = line.find(key)
while begin != -1:#在行中找到了
pos.append[begin + 1]
begin = line.find(key, begin + 1)
return pos

#==========在文件中查找==========
def search_in_file(filename, key):
f = open(filename)
count = 0#记录行数
key_dict = dict()

for each_line in f:
count += 1
if key in each_line:
pos = pos_in_line(each_line, key)
key_dict[count] = pos

f.close()
return key_dict

#==========主程序(在目录中查找)==========
def search_key(key, isprt):
all_file = os.walk(os.getcwd())#返回一个三目的元组('路径',[路径包含目录],[路径包含文件])
txt_file = []#定义空列表

for sch in all_file:
for each in sch[2]:
if os.path.splitext(each)[1] == '.txt':
each = os.path.join(i[0], each)#合并路径和文件名
txt_file.append(each)

for each_txt_file in txt_file:
key_dict = search_in_file(each_txt_file, key)
if key_dict:
print('=======================================')
print('在文件%s中找到 %s关键字'%(each_txt_file, key))
if detail in['YES', 'Yes', 'yes']:
print_pos(key_dict)

key = input('请将给脚本放置到要查找的目录,然后输入要查找关键字:')
detail = input('是否打印关键字%s的位置(YES/NO)'%key)
search_key(key,detail)