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。