code: def advance(self, n):
      res = self.s[:n]
      self.s = self.s[n:]
      return res
  
imports: import ast
  import re
  import sys
  import warnings
  from ..exceptions import DTypePromotionError
  from .multiarray import dtype, array, ndarray, promote_types
label_desc: Use image node_id 2 for calling the _Stream obj's underlying member method code with example usage: obj.advance(n) and returns: res