(path=None, prefix='', onerror=None)
Yields ModuleInfo for all modules recursively
    on path, or, if path is None, all accessible modules.

    'path' should be either None or a list of paths to look for
    modules in.

    'prefix' is a string to output on the front of every module name
    on output.

    Note that this function must import all *packages* (NOT all
    modules!) on the given path, in order to access the __path__
    attribute to find submodules.

    'onerror' is a function which gets called with one argument (the
    name of the package which was being imported) if any exception
    occurs while trying to import a package.  If no onerror function is
    supplied, ImportErrors are caught and ignored, while all other
    exceptions are propagated, terminating the search.

    Examples:

    # list all modules python can access
    walk_packages()

    # list all submodules of ctypes
    walk_packages(ctypes.__path__, ctypes.__name__+'.')
Yields ModuleInfo for all modules recursively
    on path, or, if path is None, all accessible modules.
Yields ModuleInfo for all modules recursively on path or if path is None all accessible modules .
def walk_packages(path=None, prefix='', onerror=None):
    """Yields ModuleInfo for all modules recursively
    on path, or, if path is None, all accessible modules.

    'path' should be either None or a list of paths to look for
    modules in.

    'prefix' is a string to output on the front of every module name
    on output.

    Note that this function must import all *packages* (NOT all
    modules!) on the given path, in order to access the __path__
    attribute to find submodules.

    'onerror' is a function which gets called with one argument (the
    name of the package which was being imported) if any exception
    occurs while trying to import a package.  If no onerror function is
    supplied, ImportErrors are caught and ignored, while all other
    exceptions are propagated, terminating the search.

    Examples:

    # list all modules python can access
    walk_packages()

    # list all submodules of ctypes
    walk_packages(ctypes.__path__, ctypes.__name__+'.')
    """

    def seen(p, m={}):
        if p in m:
            return True
        m[p] = True

    for info in iter_modules(path, prefix):
        yield info

        if info.ispkg:
            try:
                __import__(info.name)
            except ImportError:
                if onerror is not None:
                    onerror(info.name)
            except Exception:
                if onerror is not None:
                    onerror(info.name)
                else:
                    raise
            else:
                path = getattr(sys.modules[info.name], '__path__', None) or []

                # don't traverse path items we've seen before
                path = [p for p in path if not seen(p)]

                yield from walk_packages(path, info.name+'.', onerror)
def walk_packages ( path = None , prefix = '' , onerror = None ) : def seen ( p , m = { } ) : if p in m : return True m [ p ] = True for info in iter_modules ( path , prefix ) : yield info if info . ispkg : try : __import__ ( info . name ) except ImportError : if onerror is not None : onerror ( info . name ) except Exception : if onerror is not None : onerror ( info . name ) else : raise else : path = getattr ( sys . modules [ info . name ] , '__path__' , None ) or [ ] # don't traverse path items we've seen before path = [ p for p in path if not seen ( p ) ] yield from walk_packages ( path , info . name + '.' , onerror )