首页 > 代码库 > Python-列表
Python-列表
>>> L = [‘spam‘, ‘Spam‘, ‘SPAM!‘]
>>> L[0:2] = [‘eat‘, ‘more‘]
>>> L
[‘eat‘, ‘more‘, ‘SPAM!‘]
========================================
>>> L[1:2] = [4,5]
>>> L
[‘eat‘, 4, 5, ‘SPAM!‘]
========================================
>>> L.append(‘please‘)
>>> L
[‘eat‘, 4, 5, ‘SPAM!‘, ‘please‘]
>>> L.sort()
TypeError
因为‘eat‘是String,而4, 5是int
========================================
使用append函数,执行起来要比"+"合并速度快,因为append函数不用生成新的对象。
L[len(L):] = [X] 与 L.append(X) 一样;
L[:0] = [X] 即在列表前端附加;
以上两者都会删除空分片,并插入X;
注意:append函数与sort函数,并没有返回值;
============================================
pop函数为删除并返回一个元素,默认返回最后一个;
>>> L = [‘spam‘, ‘eggs‘, ‘ham‘, ‘toast‘]
>>> L.remove(‘eggs‘)
>>> L
[‘spam‘, ‘ham‘, ‘toast‘]
>>> L.pop(1)
‘ham‘
>>> L
[‘spam‘, ‘toast‘]
=================================
Python-列表