Python -- list 类

2020-01-13 15:30:36 浏览数 (1)

代码语言:javascript复制
Python list类常用方法
class list(object):
    def append(self, p_object): # 向列表中添加元素;
 >>> name_list
 ['shuoming', 'python', 'search']
 >>> name_list.append("python")
 >>> name_list
 ['shuoming', 'python', 'search', 'python']
    def clear(self):       # 清除列表所有元素,清除后列表为空列表;
 >>> test_list
 ['shuoming', 'python', 'search', 'python', 'automatic', 1, 2]
 >>> test_list.clear()
 >>> test_list
 []
 >>>
    def copy(self):      
    def count(self, value):    # 列表中指定元素的个数;
 >>> name_list.count("python")
 2
    def extend(self, iterable):   把一个列表添加到另一个列表中;
 >>> a
 [1, 7, 2, 9, 3, 8, 'a', 'b']
 >>> b=[2,'f',3]
 >>> a b
 [1, 7, 2, 9, 3, 8, 'a', 'b', 2, 'f', 3]
 >>> a.extend(b)
 >>> a
 [1, 7, 2, 9, 3, 8, 'a', 'b', 2, 'f', 3]
 >>> 
    def index(self, value, start=None, stop=None):   # 查列表中某一元素第一个索引值;
 >>> name_list.index("python")
 1
    def insert(self, index, p_object):   # 向列表中插入某一元素;
 >>> name_list.insert(3,"python")
 >>> name_list
 ['shuoming', 'python', 'search', 'python', 'python']
    def pop(self, index=None):   # 从列表最后删除元素;
 >>> last_one = name_list.pop()  
 >>> last_one
 'python'
 >>> name_list
 ['shuoming', 'python', 'search', 'python']
    def remove(self, value):   # 删除某一元素,默认是指定元素的第一个值;
 >>> name_list.remove('python')
 >>> name_list
 ['shuoming', 'search', 'python']
    def reverse(self):      #  翻转;
 >>> name_list
 ['shuoming', 'search', 'python', '@', '$']
 >>> name_list.reverse()
 >>> name_list
 ['$', '@', 'python', 'search', 'shuoming']
    def sort(self, key=None, reverse=False):   # 排序,特殊字符在前;
 >>> name_list
 ['shuoming', 'search', 'python',  '@', '$']
 >>> name_list.sort()
 >>> print (name_list)
 ['$', '@', 'python', 'search', 'shuoming']

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