defdifference_by(a, b, fn):b = set(map(fn, b))return[itemforiteminaiffn(item)notinb]frommathimportfloordifference_by([2.1,1.2], [2.3,3.4],floor)# [1.2]difference_by([{'x':2}, {'x':1}], [{'x':1}],lambdav : v['x'])# [ { x: 2 } ] 17、链式函数调用 你可以在一...
11、返回由queryset匹配的第一个对象 first*()* 返回由queryset匹配的第一个对象,如果没有匹配的对象,则返回None。如果QuerySet没有定义任何排序,那么QuerySet将由主键自动排序。 例子: p = models.Article.objects.order_by('title', 'created_time').first()#文章的'上一页'就是通过这个实现的previous_blog...
defdifference_by(a, b, fn): b = set(map(fn, b))return [item for item in a if fn(item) notin b]from math import floordifference_by([2.1, 1.2], [2.3, 3.4],floor) # [1.2]difference_by([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], lambda v : v['x'])# [ { ...
CURLOPT_URL,"https://moco.imooc.com/captcha/script/captcha.min.js?v=1.0"); curl_setopt($obj,CURLOPT_RETURNTRANSFER,1); curl_setopt($obj,CURLOPT_SSL_VERIFYPEER,0); $opt=curl_exec($obj); echo $opt; curl_close($obj);
get() == extract_first() 返回的是一个list,里面包含了多个string,如果只有一个string,则返回['我很孤独']这样的形式 getall() == extract() 返回的是string,list里面第一个string extract_first()与get()有区别与Selector对象有关 In [17]: type(response.xpath('//*[@id="waterfall"]/div[1]/a...
from collectionsimportCounterdef anagram(first, second):returnCounter(first) == Counter(second)anagram("abcd3","3acdb") # True 1. 2. 3. 4. 5. 6. 7. 3. 内存占用 下面的代码块可以检查变量 variable 所占用的内存。 复制 importsysvariable =30print(sys.getsizeof(variable)) #24 ...
Python >>>SKIP_DIRS=["temp","temporary_files","logs"]>>>large_dir=pathlib.Path("large_dir")>>># With a for loop>>>foriteminlarge_dir.rglob("*"):...ifset(item.parts).isdisjoint(SKIP_DIRS):...print(item)...large_dir\documentslarge_dir\documents\0.txtlarge_dir\documents\1.txt...
When prompted, select a subscription to create the resources in. When you're prompted to select a location the first time, select a location near you. This location is used for most the resources including hosting. If you're prompted for a location for the OpenAI model or for the Document...
A single Redis item in List or Get Operation. Expand table NameTypeDefault valueDescription disableAccessKeyAuthentication boolean False Authentication to Redis through access keys is disabled when set as true. Default value is false. enableNonSslPort ...
DrissionPage.easy_set import set_pathsset_paths(browser_path=r'这里修改为您的Chrome浏览器exe文件路径')这段代码会记录 Chrome 浏览器路径到配置文件...3、与requests框架代码对比图片# 案例一:获取元素内容url = 'https://baike.baidu.com/item/python'# 使用 requests:from lxml import...# 使用 Drissi...