Python发送form-data请求及拼接form-data内容的方法

#!\urs\bin\env python 
#encoding:utf-8    #设置编码方式  
  
from http2 import http 
import urllib 
 
def ReadFileAsContent(filename): 
  #print filename 
  try: 
    with open(filename, 'rb') as f: 
      filecontent = f.read() 
  except Exception, e: 
    print 'The Error Message in ReadFileAsContent(): ' + e.message  
    return '' 
  return filecontent 
 
 
def get_content_type(filename): 
  import mimetypes 
  return mimetypes.guess_type(filename)[0] or 'application/octet-stream' 
 
def isfiledata(p_str):  
  import re 
   
  r_c = re.compile("^f'(.*)'$") 
  rert = r_c.search(str(p_str)) 
  #rert = re.search("^f'(.*)'$", p_str) 
  if rert: 
    return rert.group(1) 
  else: 
    return None 
   
def encode_multipart_formdata(fields): 
  ''''' 
      该函数用于拼接multipart/form-data类型的http请求中body部分的内容 
      返回拼接好的body内容及Content-Type的头定义 
  ''' 
  import random 
  import os 
  BOUNDARY = '----------%s' % ''.join(random.sample('0123456789abcdef', 15)) 
  CRLF = '\r\n' 
  L = [] 
  for (key, value) in fields: 
    filepath = isfiledata(value) 
    if filepath: 
      L.append('--' + BOUNDARY) 
      L.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, os.path.basename(filepath))) 
      L.append('Content-Type: %s' % get_content_type(filepath)) 
      L.append('') 
      L.append(ReadFileAsContent(filepath))  
    else: 
      L.append('--' + BOUNDARY) 
      L.append('Content-Disposition: form-data; name="%s"' % key) 
      L.append('') 
      L.append(value)  
  L.append('--' + BOUNDARY + '--') 
  L.append('') 
  body = CRLF.join(L) 
  content_type = 'multipart/form-data; boundary=%s' % BOUNDARY 
  return content_type, body