Name a lambda

gistfile1.py

# A very simple recipe to allow you easily name lambda-objects 
#(or other kind of objects, callable, for example, partial 
#objects) you create, with little overhead and friendly syntax.

def Name(**kw):
    assert len(kw)==1
    name, obj = kw.items()[0]
    obj.func_name = name
    return obj

def main():
    f = Name(CheckExists=lambda:os.path.exists(some_filename))
    print f

if __name__ == '__main__':
    main()