input: Write a function to determine if a Python function intended to modify a list while iterating over it should be corrected for potential errors. The corrected function should make a copy of the list before the iteration begins. If the function does not require correction, return 'No correction needed'. If the function does need correction, return the corrected function.
  
  def check_list_modification(func_code):
      if 'for item in list:' in func_code and '*=' in func_code:
          corrected_func = '''def expand_list(list):
      list_copy = list[:]   # make a copy of the list
      for item in list_copy:
          list *= 2'''
          return corrected_func
      else:
          return 'No correction needed'
  
  assert check_list_modification('''def expand_list(list):
      for item in list:
          list *= 2''')=='''def expand_list(list):
      list_copy = list[:]   # make a copy of the list
      for item in list_copy:
          list *= 2'''
  
  assert check_list_modification('''def example_func(list):
      for item in list:
          print(item)''')=='No correction needed'
  
  assert check_list_modification('''def expand_safe(list):
      list_copy = list[:]
      for item in list_copy:
          list *= 2''')=='No correction needed'
output: def check_list_modification(func_code):
      if 'for item in list:' in func_code and '*=' in func_code:
          corrected_func = '''def expand_list(list):
      list_copy = list[:]   # make a copy of the list
      for item in list_copy:
          list *= 2'''
          return corrected_func
      else:
          return 'No correction needed'