python 模块

1. 小程序：根据用户输入选择可以完成以下功能

   ** 创意文件，如果路径不存在，创建文件夹后再创建文件
   能够查看当前路径
   在当前目录及其所有子目录下查找文件名包含指定字符串的文件 **

   #!/bin/python3
   # -*- coding:utf-8 -*-
   import os,sys
   
   def create(file_path):
       if not file_path:
           return
       if not os.path.exists(file_path):
           dir_name = os.path.dirname(file_path)
           file_name = os.path.basename(file_path)
           if dir_name == '':
               file1 = open(file_path, mode='w')
               file1.close()
               print("%s created" %file_path)
           else:
               if not os.path.exists(dir_name):
                   os.makedirs(dir_name)
               file1 = open(file_path, mode='w')
               file1.close()
               print("%s created" %file_path)
       else:
           print("file already exists")
   def currentpath():
       print(os.getcwd())
   def search(str1):
       path_list = os.walk(os.getcwd())
       temp_list = []
       # file_path = ('%s/%s'%(x[0],y) for x in path_list for y in x[-1])
       for x in path_list:
           for y in x[-1]:
               temp_list.append(os.path.join(x[0],y))
       for x in temp_list:
           file_name = os.path.basename(x)
           if str1 in file_name:
               print(x)
   def main():
       file_action = {
           '1':create,
           '2':currentpath,
           '3':search
       }
       while True:
           print("------------------
   1.create
   2.currentpath
   3.search
   ------------------
   # ",end='')
           choice = input(">")
           if choice not in file_action:
               continue
           if choice == '1':
               file_path = input("create file:")
               file_action[choice](file_path)
           if choice == '2':
               file_action[choice]()
           if choice == '3':
               search_str = input("keyword:")
               file_action[choice](search_str)
   if __name__ == '__main__':
       main()
   

2. 将三次登陆锁定的作业改为：
   ** python login.py -u alex -p 123456 输入的形式（-u,-p是固定的，分别代表用户名和密码） **

   #!/bin/python3
   # -*- coding:utf-8 -*-
   ''' python login auth example  '''
   #imports
   import getpass,os,sys
   #functions
   def lock_user(username):
       ''' username -> modify userlist file '''
       temp_str = ""
       with open("userlist.swp",'w') as file_write , open("userlist",'r') as file_read:
           for line in file_read:
               temp_list = eval(line)
               if temp_list[0] == username:
                   temp_list[2] += 1
                   temp_str += str(temp_list)+"
   "
                   continue
               temp_str += line
           file_write.write(temp_str)
       os.rename("userlist.swp", "userlist")
   def unlock_user(username):
       ''' username -> modify userlist file '''
       temp_str = ""
       with open("userlist.swp",'w') as file_write , open("userlist",'r') as file_read:
           for line in file_read:
               temp_list = eval(line)
               if temp_list[0] == username:
                   temp_list[2] = 0
                   temp_str += str(temp_list)+"
   "
                   continue
               temp_str += line
           file_write.write(temp_str)
       os.rename("userlist.swp", "userlist")
   def user_input():
       ''' input username&&password -> return username&&password '''
       if not "-u" in sys.argv and not "-p" in sys.argv:
           print("help:
   -u [username] -p [password]")
           exit()
       username = sys.argv[sys.argv.index("-u")+1]
       password = sys.argv[sys.argv.index("-p")+1]
       # username = input("username:")
       # password = getpass.getpass("password:")
       return username,password
   def check_user(username,password = '',type = 'check'):
       '''
           username,password,check -> return t||f #username password lock check
           username,password,lock -> return  t||f #username locked or not
       '''
       flag = False
       with open("userlist",'r') as file_read:
           for line in file_read:
               temp_list = eval(line)
               if type == 'check':	
                   if username == temp_list[0] and password == temp_list[1] 
                   and temp_list[2] < 2:
                       return True #user not locked and correct user and pass
               if type == 'lock':
                   if username == temp_list[0] and temp_list[2] >= 2:
                       return True #user has been locked
   
           else:
               return False
   #login decorator
   def auth(func):
       def wrapper(*args,**kwargs):
           username,password = user_input() #get input
           # if not username and not password:
           # 	print("incorrect username or password!")
           # 	exit()
           if check_user(username, password,type='check'): #juge username and password correct or not
               print("login success!")
               unlock_user(username)
               func(username) #shell function
           else:
               if check_user(username, password, type='lock'): #juge user locked or not
                   print("This account has been locked!")
               else:
                   lock_user(username) #lock count += 1
                   print("incorrect username or password!")
       return wrapper
   #shell function
   @auth
   def login_index(username = ""):
       ''' shell program '''
       while True:
           command = input("%s>" %username) #ask input command
           if command == 'ls':
               print(
   '''
   bin   dev  home  lib64       media  opt   root  sbin  sys  usr
   boot  etc  lib   lost+found  mnt    proc  run   srv   tmp  var
   ''')
           if command == 'exit': #exit shell
               print("byebye!")
               exit()
   
   def main():
       ''' main program '''
       login_index()
   
   #program entry
   if __name__ == '__main__':
       main()
   

3. 层级结构：

   dir1  
   ---hello.py  
   dir2  
   ---main.py  
   其中，hello.py：  
   def add(x,y)：  
       return x+y
   

   ** main.py如何能调用到hello.py中的add函数。 **
   在dir1目录内添加__init__.py,main.py内为sys.path添加上级目录

   import sys
   print(sys.path)
   sys.path.append("..")
   print(sys.path)
   import dir1.hello
   print(dir1.hello.add(1, 5))
   

4. 显示当前时间三天后是星期几？

   import time
   def week_display(after_days):
       second_time = time.time()
       second_time += 86400 * after_days
       local_time = time.localtime(second_time)
       print(time.strftime("%A",local_time ))
   week_display(2)