import json #use json file ,you must import json.  
  
def verify_file_class():  
  file_json=open(r'C:\temp\config_file.json','r') # open config_file.json file with 'r'  
  for each_line in file_json.readlines():     #read each line data  
    print each_line               # verify each line data by print each line data  
    
    each_line_dict = json.loads(each_line)    # each row of the data into the 'dict'type of python  
      
    print 'the type of the each_line_dict:{type}'.format(type=type(each_line_dict)) # verify whether is‘dict'type  
      
    print 'user is: {user}'.format(user=each_line_dict['user'])  
    print 'username is: {username}'.format(username=each_line_dict['username'])  
    print 'password is: {password}'.format(password=each_line_dict['password'])  
    print 'ipaddr is: {ipaddr} \n'.format(ipaddr=each_line_dict['ipaddr'])  
      
    #use username,password, ipaddr ( enjoy your programming ! )  
    
  file_json.close()  # don't forgot to close your open file before.  
  
if __name__ == '__main__':  
  verify_file_class() 

{"user":"Tom","username":"root_tom","password":"Jerryispig","ipaddr":"10.168.79.172"}  
the type of the each_line_dict:<type 'dict'>  
user is: Tom  
username is: root_tom  
password is: Jerryispig  
ipaddr is: 10.168.79.172   
  
{"user":"Jerry","username":"root_jerry","password":"Tomispig","ipaddr":"10.168.79.173"}  
the type of the each_line_dict:<type 'dict'>  
user is: Jerry  
username is: root_jerry  
password is: Tomispig  
ipaddr is: 10.168.79.173 

import os 
import shutil  
 
 
def empty_folder(dir): 
  try: 
    for each in os.listdir(dir): 
      path = os.path.join(dir,each) 
      if os.path.isfile(path): 
        os.remove(path) 
      elif os.path.isdir(path): 
        shutil.rmtree(path) 
    return 0 
  except Exception as e: 
    return 1 
 
 
if __name__ == '__main__': 
  dir_path=r'D:\installation' 
  empty_folder(dir_path) 

1. os.listdir(dir) 
2. os.path.join(dir, each) 
3. os.path.isfile(path) /os.path.isdir(path) 
4. os.remove(path) 
5. shutil.rmtree(path) 

>>> import os 
>>> os.listdir(r'c:\\') 
['$Recycle.Bin', 'Documents and Settings', 'eclipse', 'hiberfil.sys', 'inetpub', 'Intel', 'logon_log.txt', 'MSOCache', 'pagefile.sys', 'PerfLogs'<span style="font-family: Arial, Helvetica, sans-serif;">]</span> 

>>> import os 
>>> os.path.join(r'c:\doog',r's.txt') 
'c:\\doog\\s.txt' 
>>> os.path.join(r'c:\doog',r'file') 
'c:\\doog\\file' 

>>> import os 
>>> filepath=r'C:\Program Files (x86)\Google\Chrome\Application\VisualElementsManifest.xml' 
>>> os.path.isdir(filepath) 
False 
>>> os.path.isfile(filepath) 
True 

>>> import os 
>>> os.removedirs(r'c:\temp\david\book\python.txt') 

>>> import shutil 
>>> shutil.rmtree(r'C:\no1')