#!/usr/bin/python
import sys

def main((_, modname,)):
    showed = set()
    for depth, name, filename in mod_tree(__import__(modname)):
        print ' ' * 4 * depth, name, filename if name not in showed else ''
        showed.add(name)

def mod_tree(mod, seen=set()):
    yield 0, mod.__name__, getattr(mod, '__file__', None)
    if mod not in seen:
        seen.add(mod)
        for item in ((depth+1, name, filename)
                for submod in (getattr(mod, dep) for dep in dir(mod))
                if type(submod) is type(mod)
                for depth, name, filename in mod_tree(submod, seen)):
            yield item

if __name__ == '__main__':
    main(sys.argv)