Python爬虫个人总结 持续更新

爬虫中经常遇到这样的代码：

ids=['id1','id2','id3']#爬虫缓存id数据
contents=['content1','content2','content3']#爬虫缓存内容数据
for id,conten in zip(ids,contents):
	info={    #将id，content信息存入info字典中
        'content':content,
        'id':id
	}
	info_lists.append(info)

等效于：

for id,conten in [('id1','content1'),('id2','content2'),('id3','content3')]:
	info={
        'content':content,
        'id':id
	}
	info_lists.append(info)

>>> a = [1,2,3]
>>> b = [4,5,6]
>>> c = [4,5,6,7,8]
>>> zipped = zip(a,b)     # 返回一个对象
>>> zipped
<zip object at 0x103abc288>
>>> list(zipped)  # list() 转换为列表
[(1, 4), (2, 5), (3, 6)]
>>> list(zip(a,c))              # 元素个数与最短的列表一致
[(1, 4), (2, 5), (3, 6)]