code: def _limit_inf(expr, n):
      try:
          return Limit(expr, n, S.Infinity).doit(deep=False)
      except (NotImplementedError, PoleError):
          return None
  
file_path: sympy/sympy/series/limitseq.py
imports: from sympy.calculus.accumulationbounds import AccumulationBounds
  from sympy.core.add import Add
  from sympy.core.function import PoleError
  from sympy.core.power import Pow
  from sympy.core.singleton import S
  from sympy.core.symbol import Dummy
  from sympy.core.sympify import sympify
  from sympy.functions.combinatorial.numbers import fibonacci
  from sympy.functions.combinatorial.factorials import factorial, subfactorial
  from sympy.functions.special.gamma_functions import gamma
  from sympy.functions.elementary.complexes import Abs
  from sympy.functions.elementary.miscellaneous import Max, Min
  from sympy.functions.elementary.trigonometric import cos, sin
  from sympy.series.limits import Limit
label_desc: Use image node_id 3 for calling a global function with example usage: _limit_inf(expr, n) and returns: Limit, None