作者:捡耙活哟752 | 来源:互联网 | 2023-06-28 18:55
原标题:python中的pop()函数
python中的pop()函数
语法:
列表 list.pop(obj=list[-1])
pop()用于删除并返回列表中的一个元素(默认为最后一个元素)
字典dict.pop(key[,default])
pop()用于删除字典中给定的key及对应的value,返回被删除key对应的value,key值必须给出www.yii666.com。给定的key值不在字典中时,返回default值。
- key:需要删除的key值(不给出会报错)
- default:若没有字典中key值,返回default值(给定的key值不在字典中时必须设置,否则会报错)
实例:
&www.yii666.comgt;>> list1 = [1,2,4,"hello","xy","你好"]
>>> a = list1.pop()
&文章来源站点https://www.yii666.com/gt;>> print(a,list1)
你好 [1,2,4,"hello","xy"]
>>> list2 = [1,2,4,"hello","xy","你好"]
>>> b = list2.pop(3)
>>> print(b,list2)
hello [1,2,4,"xy","你好“]
>>> dict1 文章来源地址35343.html= {"papa":"xy","sis":"nikki","dude":"cwy"}
>>> c = dict.pop()
Traceback (most recent call last):
File "<文章来源地址35343.html;pyshell#2>", line 1, in <module>
c = dict.pop()
TypeError: unbound method dict.pop() needs an argument
>>> dict1 = {"papa":"xy","sis":"nikki","dude":"cwy"}
>>> c = dict1.pop("papa")
>>> print(c,dict1)
xy {'sis': 'nikki', 'dude': 'cwy'}
>>> dict2 = {"papa":"xy","sis":"nikki","dude":"cwy"}
>>> d = dict2.pop("www")
Traceback (most recent call last):
File "", line 1, in <module>
d = dict2.pop("www")
KeyError: 'www'
>>> dict2 = {"papa":"xy","sis":"nikki","dude":"cwy"}
>>> d = dict2.pop("www","不在字典内")
>>> print(d,dict2)
不在字典内 {'papa': 'xy', 'sis': 'nikki', 'dude': 'cwy'}
来源于:python中的pop()函数