File "/usr/lib/python3/dist-packages/IPython/config/__init__.py", line 16, in <module> from .application import * File "/usr/lib/python3/dist-packages/IPython/config/application.py", line 31, in <module> from IPython.config.configurable import SingletonConfigurable File "/usr/lib/python3/dist-packages/IPython/config/configurable.py", line 33, in <module> from IPython.utils.text import indent, wrap_paragraphs File "/usr/lib/python3/dist-packages/IPython/utils/text.py", line 28, in <module> from IPython.external.path import path File "/usr/lib/python3/dist-packages/IPython/external/path/__init__.py", line 2, in <module> from path import * File "/home/jhammel/python/path.py", line 25 print root(path) ^

class fireonce(object):
    def __init__(self, func):
        self.func = func
    def __call__(self, *args, **kwargs):
        if not self.func:
            return None
        retval = self.func(*args, **kwargs)
        self.func = None

@fireonce
def foo(x):
    print x
    
foo('bar')
foo('fleem') # not printed