Python的字典和列表的使用中一些需要注意的地方

>>> info = dict(name='cold', blog='www.linuxzen.com') # 创建字典{'name':'cold', 'blog':'www.linuxzen.com'}
>>> info2 = info   # 赋值给info2
>>> info2['name'] = 'cold night'
>>> info
>>> info2
{'blog': 'www.linuxzen.com', 'name': 'cold night'}
>>> info
{'blog': 'www.linuxzen.com', 'name': 'cold night'}
>>> names = ['cold', 'night', 'linuxzen']
>>> names2 = names
>>> names2.append('cold night')
>>> names
['cold', 'night', 'linuxzen', 'cold night']
>>> names2
['cold', 'night', 'linuxzen', 'cold night']

>>> def add_something(info):
...   if type(info) == dict:
...       info['msg'] = 'Hello,'+ info['name']
...   elif type(info) == list:
...       info.append('add to the list')
... 
>>> info = {'name':'cold', 'blog':'www.linuxzen.com'}
>>> add_something(info)
>>> info
{'blog': 'www.linuxzen.com', 'msg': 'Hello,cold', 'name': 'cold'}
>>> names = ['cold', 'night', 'linuxzen.com']
>>> add_something(names)
>>> names
['cold', 'night', 'linuxzen.com', 'add to the list']

>>> names = ['cold', 'night', 'linuxzen.com']
>>> names2 = names[:]
>>> names2.append('cold night')
>>> names
['cold', 'night', 'linuxzen.com']
>>> names2
['cold', 'night', 'linuxzen.com', 'cold night']
>>> info = {'name':'cold night', 'blog':'www.linuxzen.com'}
>>> info2 = info.copy()
>>> info2['name'] = 'cold'
>>> info
{'blog': 'www.linuxzen.com', 'name': 'cold night'}
>>> info2
{'blog': 'www.linuxzen.com', 'name': 'cold'}