python第四课：列表的功能

class list(object):
    """
    list() -> new empty list
    list(iterable) -> new list initialized from iterable's items
    """
    def append(self, p_object): # real signature unknown; restored from __doc__
      ---- 追加-----
     name_list=["alex","blex","clex"] 
     tem=name_list.append("1")
     print(tem)
       """ L.append(object) -- append object to end """
        pass

    def count(self, value): # real signature unknown; restored from __doc__
        ----统计某个元素出现的次数-----
     name_list=["alex","blex","clex"] 
     tem=name_list.count("alex")
     print(tem)
       """ L.count(value) -> integer -- return number of occurrences of value """
        return 0

    def extend(self, iterable): # real signature unknown; restored from __doc__
        ----扩展-----
       temp=["11","22","33"]
       name_list=["alex","blex","clex"] 
       tem=name_list.extend(temp)
       print(tem)
        """ L.extend(iterable) -- extend list by appending elements from the iterable """
        pass

    def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__
         ----获取指定字符的索引-----
       name_list=["alex","blex","clex"] 
       tem=name_list.index("alex")
       print(tem)
        """
        L.index(value, [start, [stop]]) -> integer -- return first index of value.
        Raises ValueError if the value is not present.
        """
        return 0

    def insert(self, index, p_object): # real signature unknown; restored from __doc__
        ----往指定索引值位置添加字符----
       name_list=["alex","blex","clex"] 
       tem=name_list.insert(1,"sb")
       print(tem) 
       """ L.insert(index, object) -- insert object before index """
        pass

    def pop(self, index=None): # real signature unknown; restored from __doc__
       ----移除指定索引的字符,并可赋值-----
       name_list=["alex","blex","clex"] 
       tem=name_list.pop(2)
       print(tem)
         """
        L.pop([index]) -> item -- remove and return item at index (default last).
        Raises IndexError if list is empty or index is out of range.
        """
        pass

    def remove(self, value): # real signature unknown; restored from __doc__
        ----移除指定字符-----
       name_list=["alex","blex","clex"] 
       tem=name_list.pop(2)
       print(tem)
        """
        L.remove(value) -- remove first occurrence of value.
        Raises ValueError if the value is not present.
        """
        pass

    def reverse(self): # real signature unknown; restored from __doc__
        ----字符串反转，即倒置-----
       name_list=["alex","blex","clex"] 
       tem=name_list.reverse()
       print(tem)
        """ L.reverse() -- reverse *IN PLACE* """
        pass

    def sort(self, cmp=None, key=None, reverse=False): # real signature unknown; restored from __doc__
         """
        L.sort(cmp=None, key=None, reverse=False) -- stable sort *IN PLACE*;
        cmp(x, y) -> -1, 0, 1
        """
        pass

 

一列表

1.什么是列表

字符串的集合  eg：name_list["alex","blex","clex"]

1.1索引

print(name_list[0])

1.2切片

print(name_list[0:2])

1.3len

print(name_list[2:len(name_list)])

1.4删除指定字符

del name_list[0]

1.4for

for i in name_list:

      print(i)

list内部提供的方法

 2.元组

与组合列表基本一致，

差别：元组不能修改（不能增删改查）。

格式name_tuple("alex","eric")

2.1功能

name_tuple=("alex","eric")

索引

print(name_tuple[0])

len

print(name_tuple[len(name_tuple)-1])

切片

print(name_tuple[0:1])

for

for i in name_tuple:

       print(i)

count：获取指定元素出现的个数。

print(name_tuple.count("alex"))

index：获取指定索引的值。

print（name_tuple.index("alex")）