code: def _analyze_gens(gens):
      """Support for passing generators as `*gens` and `[gens]`."""
      if len(gens) == 1 and hasattr(gens[0], "__iter__"):
          return tuple(gens[0])
      else:
          return tuple(gens)
  
imports: from __future__ import annotations
  from sympy.external.gmpy import GROUND_TYPES
  from sympy.core import S, Add, Mul, Pow, Eq, Expr, expand_mul, expand_multinomial
  from sympy.core.exprtools import decompose_power, decompose_power_rat
  from sympy.core.numbers import _illegal
  from sympy.polys.polyerrors import PolynomialError, GeneratorsError
  from sympy.polys.polyoptions import build_options
  import re
label_desc: Use image node_id 4 for calling a global function with example usage: _analyze_gens(gens) and returns: tuple, tuple