python - "Least Astonishment" et le Mutable Default Argument

96

fruits = ("apples", "bananas", "loganberries")  def eat(food=fruits):     ... 

def some_random_function():     global fruits     fruits = ("blueberries", "mangos") 

StringBuffer s = new StringBuffer("Hello World!"); Map<StringBuffer,Integer> counts = new HashMap<StringBuffer,Integer>(); counts.put(s, 5); s.append("!!!!"); System.out.println( counts.get(s) );  // does this work? 

84

def whats_on_the_telly(penguin=None):     if penguin is None:         penguin = []     penguin.append("property of the zoo")     return penguin 

78

a = [] 

def x(a=[]): 

def x(a=datetime.datetime.now()): 

b = datetime.datetime.now() def x(a=b): 

def x(static a=b): 

65

class BananaBunch:     bananas = []      def addBanana(self, banana):         self.bananas.append(banana)