code: def preclean_input(self, block):
      lines = block.splitlines()
      while lines and not lines[0].strip():
          lines = lines[1:]
      return strip_email_quotes("\n".join(lines))
  
file_path: catboost/contrib/python/ipython/py2/IPython/terminal/magics.py
imports: from __future__ import print_function
  from logging import error
  import os
  import sys
  from IPython.core.error import TryNext, UsageError
  from IPython.core.inputsplitter import IPythonInputSplitter
  from IPython.core.magic import Magics, magics_class, line_magic
  from IPython.lib.clipboard import ClipboardEmpty
  from IPython.utils.text import SList, strip_email_quotes
  from IPython.utils import py3compat
label_desc: Use image node_id 3 for calling the TerminalMagics obj's underlying member method code with example usage: obj.preclean_input(block) and returns: strip_email_quotes