code: def test_FracElement_copy():
      F, x, y, z = field("x,y,z", ZZ)
  
      f = x * y / 3 * z
      g = f.copy()
  
      assert f == g
      g.numer[(1, 1, 1)] = 7
      assert f != g
  
imports: from sympy.polys.fields import field, sfield, FracField, FracElement
  from sympy.polys.rings import ring
  from sympy.polys.domains import ZZ, QQ
  from sympy.polys.orderings import lex
  from sympy.testing.pytest import raises, XFAIL
  from sympy.core import symbols, E
  from sympy.core.numbers import Rational
  from sympy.functions.elementary.exponential import exp, log
  from sympy.functions.elementary.miscellaneous import sqrt
label_desc: Use image node_id 6 for calling a global function with example usage: test_FracElement_copy() without return types