命名空间/函数之一道有坑的面试题

1.作用域函数之一道有坑的面试题

# 2，(此题有坑)下面代码打印的结果分别是_________,________,________.
def extendList(val, list=[]):  # 默认值在内存只会产生一份
    print(id(list))
    list.append(val)
    return list


list1 = extendList(10)
list2 = extendList(123, [])
list3 = extendList('a')
print('list1=%s' % list1)  # list1 = [10]
print('list2=%s' % list2)  # list2 = [123]
print('list3=%s' % list3)  # list = ['a']
"""
3236240122440
3236240122504
3236240122440
list1=[10, 'a']
list2=[123]
list3=[10, 'a']
"""