code: def set_context(self, ctx):
      if HAS_CAIRO_CFFI and not isinstance(ctx, cairo.Context):
          ctx = cairo.Context._from_pointer(
              cairo.ffi.cast(
                  "cairo_t **", id(ctx) + object.__basicsize__
              )[0],
              incref=True,
          )
  
      self.gc.ctx = ctx
  
file_path: catboost/contrib/python/matplotlib/py2/matplotlib/backends/backend_gtk3cairo.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  from .None import backend_cairo, backend_gtk3
  from .backend_cairo import cairo, HAS_CAIRO_CFFI
  from .backend_gtk3 import _BackendGTK3
  from matplotlib.backend_bases import cursors
label_desc: Use image node_id 1 for calling the RendererGTK3Cairo obj's underlying member method code with example usage: obj.set_context(ctx) without return types