fooker1.py

# What output you expect form this?

class Fooker(object):
	def __init__(self, items = []):
		self.items = items

	def append(self, item):
		self.items.append(item)

o = Fooker()
o.append("1234")
print(o.items)

o1 = Fooker()
o1.append("1234")
print(o1.items)

› python s.py
['1234']
['1234', '1234']

but it's really strange to me... Why?

Answer http://www.deadlybloodyserious.com/2008/05/default-argument-blunders/

Good to know, but seems too un-obvious to me..