Python的列表学习（四）

     列表的定义很简单，关键字是list，比如我们定义一个列表，它的所有的方法来自list类，我们可以

来看下llist类的方法，见如下的代码：

#!/usr/bin/env python 
#coding:utf-8

list=[1,2,3,4,5]

print dir(list)
print help(type(list))

见如上代码执行后的输出内容：

C:\Python27\python.exe D:/git/Python/FullStack/Study/index.py
['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__delslice__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getslice__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__setslice__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']
Help on class list in module __builtin__:

class list(object)
 |  list() -> new empty list
 |  list(iterable) -> new list initialized from iterable's items
 |  
 |  Methods defined here:
 |  
 |  __add__(...)
 |      x.__add__(y) <==> x+y
 |  
 |  __contains__(...)
 |      x.__contains__(y) <==> y in x
 |  
 |  __delitem__(...)
 |      x.__delitem__(y) <==> del x[y]
 |  
 |  __delslice__(...)
 |      x.__delslice__(i, j) <==> del x[i:j]
 |      
 |      Use of negative indices is not supported.
 |  
 |  __eq__(...)
 |      x.__eq__(y) <==> x==y
 |  
 |  __ge__(...)
 |      x.__ge__(y) <==> x>=y
 |  
 |  __getattribute__(...)
 |      x.__getattribute__('name') <==> x.name
 |  
 |  __getitem__(...)
 |      x.__getitem__(y) <==> x[y]
 |  
 |  __getslice__(...)
 |      x.__getslice__(i, j) <==> x[i:j]
 |      
 |      Use of negative indices is not supported.
 |  
 |  __gt__(...)
 |      x.__gt__(y) <==> x>y
 |  
 |  __iadd__(...)
 |      x.__iadd__(y) <==> x+=y
 |  
 |  __imul__(...)
 |      x.__imul__(y) <==> x*=y
 |  
 |  __init__(...)
 |      x.__init__(...) initializes x; see help(type(x)) for signature
 |  
 |  __iter__(...)
 |      x.__iter__() <==> iter(x)
 |  
 |  __le__(...)
 |      x.__le__(y) <==> x<=y
 |  
 |  __len__(...)
 |      x.__len__() <==> len(x)
 |  
 |  __lt__(...)
 |      x.__lt__(y) <==> x<y
 |  
 |  __mul__(...)
 |      x.__mul__(n) <==> x*n
 |  
 |  __ne__(...)
 |      x.__ne__(y) <==> x!=y
 |  
 |  __repr__(...)
 |      x.__repr__() <==> repr(x)
 |  
 |  __reversed__(...)
 |      L.__reversed__() -- return a reverse iterator over the list
 |  
 |  __rmul__(...)
 |      x.__rmul__(n) <==> n*x
 |  
 |  __setitem__(...)
 |      x.__setitem__(i, y) <==> x[i]=y
 |  
 |  __setslice__(...)
 |      x.__setslice__(i, j, y) <==> x[i:j]=y
 |      
 |      Use  of negative indices is not supported.
 |  
 |  __sizeof__(...)
 |      L.__sizeof__() -- size of L in memory, in bytes
 |  
 |  append(...)
 |      L.append(object) -- append object to end
 |  
 |  count(...)
 |      L.count(value) -> integer -- return number of occurrences of value
 |  
 |  extend(...)
 |      L.extend(iterable) -- extend list by appending elements from the iterable
 |  
 |  index(...)
 |      L.index(value, [start, [stop]]) -> integer -- return first index of value.
 |      Raises ValueError if the value is not present.
 |  
 |  insert(...)
 |      L.insert(index, object) -- insert object before index
 |  
 |  pop(...)
 |      L.pop([index]) -> item -- remove and return item at index (default last).
 |      Raises IndexError if list is empty or index is out of range.
 |  
 |  remove(...)
 |      L.remove(value) -- remove first occurrence of value.
 |      Raises ValueError if the value is not present.
 |  
 |  reverse(...)
 |      L.reverse() -- reverse *IN PLACE*
 |  
 |  sort(...)
 |      L.sort(cmp=None, key=None, reverse=False) -- stable sort *IN PLACE*;
 |      cmp(x, y) -> -1, 0, 1
 |  
 |  ----------------------------------------------------------------------
 |  Data and other attributes defined here:
 |  
 |  __hash__ = None
 |  
 |  __new__ = <built-in method __new__ of type object>
 |      T.__new__(S, ...) -> a new object with type S, a subtype of T

None

Process finished with exit code 0

下面我们来看list类中这些方法的具体使用，具体见如下的代码：

#!/usr/bin/env python
#coding:utf-8

list=[1,2,3,4,5]

#查看元素在列表中的位置
print u'5在列表中的位置:',list.index(5)
#依据索引查看元素的内容
print u'索引为4在列表中的内容为:',list[4]
#查看列表的所有内容
for item in list:
    print item
#添加列表
list.append('wuya')
print u'查看列表添加后的内容:',list
#依据位置插入添加列表
list.insert(0,'selenium')
print u'查看列表添加后的内容:',list
#删除指定的列表元素
list.remove('wuya')
print u'查看删除后的列表内容:',list
#修改列表中的内容
list[0]='android'
print u'查看更新后的列表内容:',list
#删除列表的最后一位并输出删除的内容
print list.pop()
#查看列表元素在列表中的个数
print u'查看列表元素的个数:',list.count('android')
#扩展列表
list1=['a','b','c']
list.extend(list1)
print u'查看扩展后的列表内容:',list
#列表的反转
list.reverse()
print u'查看反转后的列表内容:',list
#列表的排序
list.sort()
print u'查看排序后的列表内容:',list
#删除指定位置的列表
del list[0]
print u'查看删除指定位置后的列表内容:',list

     OK，list常用的方法就这些，就总结到这里。