python3列表方法，元组方法

Posted 2020-10-06

>>>list=[‘a‘,1,‘1‘]
>>> dir(list)
[‘__add__‘, ‘__class__‘, ‘__contains__‘, ‘__delattr__‘, ‘__delitem__‘, ‘__dir__‘, ‘__doc__‘, ‘__eq__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__getitem__‘, ‘__gt__‘, ‘__hash__‘, ‘__iadd__‘, ‘__imul__‘, ‘__init__‘, ‘__init_subclass__‘, ‘__iter__‘, ‘__le__‘, ‘__len__‘, ‘__lt__‘, ‘__mul__‘, ‘__ne__‘, ‘__new__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__reversed__‘, ‘__rmul__‘, ‘__setattr__‘, ‘__setitem__‘, ‘__sizeof__‘, ‘__str__‘, ‘__subclasshook__‘, ‘append‘, ‘clear‘, ‘copy‘, ‘count‘, ‘extend‘, ‘index‘, ‘insert‘, ‘pop‘, ‘remove‘, ‘reverse‘, ‘sort‘]

‘append‘, ‘clear‘, ‘copy‘, ‘count‘, ‘extend‘, ‘index‘, ‘insert‘, ‘pop‘, ‘remove‘, ‘reverse‘, ‘sort‘]
“追加”、“清除”、“复制”、“计数”、“扩展”、“索引”、“插入”、“弹出”、“删除”、“反向”、“排序”。

append(self, p_object):                        

>>> list=[1]
>>> list.append(2)
>>> list
[1, 2]
>>>

clear(self):
>>> list=[‘a‘,‘b‘]
>>> list.clear()
>>> list
[]    
>>>

copy(self):
>>> list=[1]
>>> list1=list.copy()
>>> list1
[1]
>>>

count(self, value):
>>> list=[1,2,3,4,5,1]
>>> list.count(1)
2
>>>

extend(self, iterable):
>>> list=[1,2,3]
>>> list.extend({1:2})
>>> list
[1, 2, 3, 1]
>>>

index(self, value, start=None, stop=None):
>>> list=[1,2,3,2]
>>> list.index(2)
1
>>>
没有该元素则报错

insert(self, index, p_object):
>>> list=[1,2,3]
>>> list.insert(3,5)
>>> list
[1, 2, 3, 5]
>>>

pop(self, index=None):
>>> list=[1,2,3]
>>> list.pop(0)
1
>>> list
[2,3]
>>> list=[1,2,3]
>>> list.pop()
3
>>> list
[1, 2]

remove(self, value):
>>> list=[1,2,3]
>>> list.remove(1)
>>> list
[2, 3]
>>>

reverse(self):
>>> list=[1,3,2,3]
>>> list.reverse()
>>> list
[3, 2, 3, 1]
>>>

sort(self, key=None, reverse=False):
>>> list=[1,3,2,3]
>>> list.sort()
>>> list
[1, 2, 3, 3]
>>>

t=(1,2)
print(type(t))
print(dir(t))

运行结果：
<class ‘tuple‘>
[‘__add__‘, ‘__class__‘, ‘__contains__‘, ‘__delattr__‘, ‘__dir__‘, ‘__doc__‘, ‘__eq__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__getitem__‘, ‘__getnewargs__‘, ‘__gt__‘, ‘__hash__‘, ‘__init__‘, ‘__init_subclass__‘, ‘__iter__‘, ‘__le__‘, ‘__len__‘, ‘__lt__‘, ‘__mul__‘, ‘__ne__‘, ‘__new__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__rmul__‘, ‘__setattr__‘, ‘__sizeof__‘, ‘__str__‘, ‘__subclasshook__‘, ‘count‘, ‘index‘]




count(self, value): 
t=(1,4,4,2,3,4,3,5)
print(t.count(3))
运行结果：
2
  
index(self, value, start=None, stop=None): 
t=(1,4,4,2,3,4,3,5)
print(t.index(3))
运行结果：
4