search.py

def search_file(search_dir='/',file=None):
    if file is None:
        result = search_dir
        return result
    else:
        for i in os.listdir(search_dir):
            path_file = os.path.join(search_dir,i)
            if os.path.isfile(path_file):
                if i == file:
                    result = path_file
                    print path_file
                    return result
            else:
                search_file(search_dir=path_file,file=file)

write this code for search one file