class_docstr: Parameters
  ----------
  name : str
      Extension name.
  sources : list of str
      List of source file locations relative to the top directory of
      the package.
  extra_compile_args : list of str
      Extra command line arguments to pass to the compiler.
  extra_f77_compile_args : list of str
      Extra command line arguments to pass to the fortran77 compiler.
  extra_f90_compile_args : list of str
      Extra command line arguments to pass to the fortran90 compiler.
code: def has_f2py_sources(self):
      for source in self.sources:
          if fortran_pyf_ext_re(source):
              return True
      return False
  
imports: import re
  from distutils.extension import Extension
label_desc: Use image node_id 3 for calling the Extension obj's underlying member method code with example usage: obj.has_f2py_sources() and returns: False, True