class - How to allow __init__ to allow 1 or no parameters in python -

right have class:

class foo():   def __init__(self):       self.l = [] 

right now, can set variable foo without argument in parameter because doesn't take one, how can allow continue take no required parameters, put in list if wanted foo()? example:

>>> f = foo([1,2,3]) #would legal , >>> f = foo() # legal 

def __init__(self, items=none):     if items none: items = []     self.l = items 

in response @eastsun's edit, propose different structure __init__

def __init__(self, items=()):     ''' accepts iterable      appropriate typeerror raised if items not iterable '''     self.l = list(items) 

note lowercase l bad name, can confused 1