parameters: (self, subtype, boundary=None, plist=[], prefix=1)
return_statement: return self.startbody("multipart/" + subtype,
                                [("boundary", self._boundary)] + plist,
                                prefix=prefix)
docstring: Returns a file-like object for writing the body of the message.
  
          Additionally, this method initializes the multi-part code, where the
          subtype parameter provides the multipart subtype, the boundary
          parameter may provide a user-defined boundary specification, and the
          plist parameter provides optional parameters for the subtype.  The
          optional argument, prefix, determines where the header is inserted;
          0 means append at the end, 1 means insert at the start. The default
          is to insert at the start.  Subparts should be created using the
          nextpart() method.
docstring_summary: Returns a file-like object for writing the body of the message.
docstring_tokens: Returns a file - like object for writing the body of the message .
function: def startmultipartbody(self, subtype, boundary=None, plist=[], prefix=1):
          """Returns a file-like object for writing the body of the message.
  
          Additionally, this method initializes the multi-part code, where the
          subtype parameter provides the multipart subtype, the boundary
          parameter may provide a user-defined boundary specification, and the
          plist parameter provides optional parameters for the subtype.  The
          optional argument, prefix, determines where the header is inserted;
          0 means append at the end, 1 means insert at the start. The default
          is to insert at the start.  Subparts should be created using the
          nextpart() method.
  
          """
          self._boundary = boundary or mimetools.choose_boundary()
          return self.startbody("multipart/" + subtype,
                                [("boundary", self._boundary)] + plist,
                                prefix=prefix)
function_tokens: def startmultipartbody ( self , subtype , boundary = None , plist = [ ] , prefix = 1 ) : self . _boundary = boundary or mimetools . choose_boundary ( ) return self . startbody ( "multipart/" + subtype , [ ( "boundary" , self . _boundary ) ] + plist , prefix = prefix )