python列表操作使用示例分享

复制代码 代码如下:

Python 3.3.4 (v3.3.4:7ff62415e426,Feb 10 2014,18:13:51) [MSC v.1600 64 bit (AMD64)] on win32
Type "copyright","credits" or "license()" for more information.
>>> cast=["cleese","palin","jones","idle"]
>>> print(cast)
['cleese','palin','jones','idle']
>>> print(len(cast))#显示数据项数量
4
>>> print(cast[1])#显示列表中第2个数据项的值
palin
>>> cast.append("gilliam")#在列表末尾添加一个数据项
>>> print(cast)
['cleese','idle','gilliam']
>>> cast.pop()#删除列表末尾的数据项
'gilliam'
>>> print(cast)
['cleese','idle']
>>> cast.extend(["gilliam","chapman"])#在列表末尾增加一个数据项集合
>>> print(cast)
['cleese','gilliam','chapman']
>>> cast.remove("chapman")#删除指定的数据项
>>> print(cast)
['cleese','gilliam']
>>> cast.insert(0,"chapman")#在指定的位置增加数据项
>>> print(cast)
['chapman','cleese','gilliam']
>>>

下面是讲定义一个def函数，isinstance()函数，for in，if else等的运用以及逻辑

复制代码 代码如下:

movies=["the holy grail",1975,"terry jone & terry gilliam",91,
       ["graham chapman",
       ["michael palin","john cleese","terry gilliam",
            "eric idle","terry jones"]]]
def print_lol(the_list):#定义一种函数
        for each_item in the_list:#for in循环迭代处理列表，从列表起始位置到末尾
        if isinstance(each_item,list):#isinstance()检测each_item里每一项
                                              #是不是list类型
            print_lol(each_item)#如果是，调用函数print_lol
        else:print(each_item)#如果不是，输出这一项

print_lol(movies)#在movies列表中调用函数
"""
之前if else语句不对齐导致报错
"""