parameters: (self, filename, signer, sign_password, keystore=None)
return_statement: return sig_file
docstring: Sign a file.
  
          :param filename: The pathname to the file to be signed.
          :param signer: The identifier of the signer of the file.
          :param sign_password: The passphrase for the signer's
                                private key used for signing.
          :param keystore: The path to a directory which contains the keys
                           used in signing. If not specified, the instance's
                           ``gpg_home`` attribute is used instead.
          :return: The absolute pathname of the file where the signature is
                   stored.
docstring_summary: Sign a file.
docstring_tokens: Sign a file .
function: def sign_file(self, filename, signer, sign_password, keystore=None):
          """
          Sign a file.
  
          :param filename: The pathname to the file to be signed.
          :param signer: The identifier of the signer of the file.
          :param sign_password: The passphrase for the signer's
                                private key used for signing.
          :param keystore: The path to a directory which contains the keys
                           used in signing. If not specified, the instance's
                           ``gpg_home`` attribute is used instead.
          :return: The absolute pathname of the file where the signature is
                   stored.
          """
          cmd, sig_file = self.get_sign_command(filename, signer, sign_password,
                                                keystore)
          rc, stdout, stderr = self.run_command(cmd,
                                                sign_password.encode('utf-8'))
          if rc != 0:
              raise DistlibException('sign command failed with error '
                                     'code %s' % rc)
          return sig_file
function_tokens: def sign_file ( self , filename , signer , sign_password , keystore = None ) : cmd , sig_file = self . get_sign_command ( filename , signer , sign_password , keystore ) rc , stdout , stderr = self . run_command ( cmd , sign_password . encode ( 'utf-8' ) ) if rc != 0 : raise DistlibException ( 'sign command failed with error ' 'code %s' % rc ) return sig_file