Help on class Extension in module distutils.extension:

class Extension(builtins.object)
 |  Extension(name, sources, include_dirs=None, define_macros=None, undef_macros=None, library_dirs=None, libraries=None, runtime_library_dirs=None, extra_objects=None, extra_compile_args=None, extra_link_args=None, export_symbols=None, swig_opts=None, depends=None, language=None, optional=None, **kw)
 |  
 |  Just a collection of attributes that describes an extension
 |  module and everything needed to build it (hopefully in a portable
 |  way, but there are hooks that let you be as unportable as you need).
 |  
 |  Instance attributes:
 |    name : string
 |      the full name of the extension, including any packages -- ie.
 |      *not* a filename or pathname, but Python dotted name
 |    sources : [string]
 |      list of source filenames, relative to the distribution root
 |      (where the setup script lives), in Unix form (slash-separated)
 |      for portability.  Source files may be C, C++, SWIG (.i),
 |      platform-specific resource files, or whatever else is recognized
 |      by the "build_ext" command as source for a Python extension.
 |    include_dirs : [string]
 |      list of directories to search for C/C++ header files (in Unix
 |      form for portability)
 |    define_macros : [(name : string, value : string|None)]
 |      list of macros to define; each macro is defined using a 2-tuple,
 |      where 'value' is either the string to define it to or None to
 |      define it without a particular value (equivalent of "#define
 |      FOO" in source or -DFOO on Unix C compiler command line)
 |    undef_macros : [string]
 |      list of macros to undefine explicitly
 |    library_dirs : [string]
 |      list of directories to search for C/C++ libraries at link time
 |    libraries : [string]
 |      list of library names (not filenames or paths) to link against
 |    runtime_library_dirs : [string]
 |      list of directories to search for C/C++ libraries at run time
 |      (for shared extensions, this is when the extension is loaded)
 |    extra_objects : [string]
 |      list of extra files to link with (eg. object files not implied
 |      by 'sources', static library that must be explicitly specified,
 |      binary resource files, etc.)
 |    extra_compile_args : [string]
 |      any extra platform- and compiler-specific information to use
 |      when compiling the source files in 'sources'.  For platforms and
 |      compilers where "command line" makes sense, this is typically a
 |      list of command-line arguments, but for other platforms it could
 |      be anything.
 |    extra_link_args : [string]
 |      any extra platform- and compiler-specific information to use
 |      when linking object files together to create the extension (or
 |      to create a new static Python interpreter).  Similar
 |      interpretation as for 'extra_compile_args'.
 |    export_symbols : [string]
 |      list of symbols to be exported from a shared extension.  Not
 |      used on all platforms, and not generally necessary for Python
 |      extensions, which typically export exactly one symbol: "init" +
 |      extension_name.
 |    swig_opts : [string]
 |      any extra options to pass to SWIG if a source file has the .i
 |      extension.
 |    depends : [string]
 |      list of files that the extension depends on
 |    language : string
 |      extension language (i.e. "c", "c++", "objc"). Will be detected
 |      from the source extensions if not provided.
 |    optional : boolean
 |      specifies that a build failure in the extension should not abort the
 |      build process, but simply not install the failing extension.
 |  
 |  Methods defined here:
 |  
 |  __init__(self, name, sources, include_dirs=None, define_macros=None, undef_macros=None, library_dirs=None, libraries=None, runtime_library_dirs=None, extra_objects=None, extra_compile_args=None, extra_link_args=None, export_symbols=None, swig_opts=None, depends=None, language=None, optional=None, **kw)
 |      Initialize self.  See help(type(self)) for accurate signature.
 |  
 |  __repr__(self)
 |      Return repr(self).
 |  
 |  ----------------------------------------------------------------------
 |  Data descriptors defined here:
 |  
 |  __dict__
 |      dictionary for instance variables (if defined)
 |  
 |  __weakref__
 |      list of weak references to the object (if defined)