class_docstr: Context for fast low-precision arithmetic (53-bit precision, giving at most
  about 15-digit accuracy), using Python's builtin float and complex.
code: def isint(ctx, z):
      if hasattr(
          z, "imag"
      ):  # float/int don't have .real/.imag in py2.5
          if z.imag:
              return False
          z = z.real
      try:
          return z == int(z)
      except:
          return False
  
imports: from .ctx_base import StandardBaseContext
  import math
  import cmath
  from .None import math2
  from .None import function_docs
  from .libmp import mpf_bernoulli, to_float, int_types
  from .None import libmp
label_desc: Use image node_id 18 for calling the FPContext obj's underlying member method code with example usage: obj.isint(ctx, z) and returns: unknown, False, False