返回对象是对象列表的: all(), filter(), exclude(), order_by(), reverse(), values(), values_list(), distinct() 返回结果是对象: get(), first(), last() 返回结果是布尔值: exists() 返回数字: count() 数据准备 接着前面的User表,测试数据如下 ...
>>> from django.db.models import Count>>> q = Blog.objects.annotate(Count('entry'))# The name of the first blog>>> q[0].name'Blogasaurus'# The number of entries on the first blog>>> q[0].entry__count42 1. Blog模型本身没有定义entry__count属性,但是通过使用一个...
filter(lambda x:x[1]!='0') print(list_content.map(lambda s:len(s)).reduce(lambda a,b:a+b)) #获取样例数据 test = result_content.take(10) for x in test: print (x[1]) print(type(x)) ''' jieba.enable_parallel(8) input_file = open(input_file_name, 'r', encoding='utf-8...
sum_classes = flights[['economy_class', 'business_class', 'first_class']].sum(axis = 1)passenger_equ = sum_classes == flights['total_passengers']# Find and filter out rows with inconsistent passenger totalsinconsistent_p...
import numpy as npimport pandas as pdimport matplotlib.pyplot as pltfrom matplotlib import rcParamsimport seaborn as snsimport warningswarnings.filterwarnings('ignore') 在这里,我们将使用KNeighborsClassifier进行实验: from sklearn.neighbors import KNeighborsClassifier ...
def address(request, lid): address_list = locations.objects.select_related().filter(location_id=lid) s = "" for loc in address_list: s = '[{"STREET_ADDRESS":"' + loc.street_address + \ '","CITY":"' + loc.city + \ '","POSTAL_CODE":"' + loc.postal_code + \ '","COUNTR...
filter(username=username, password=password).first() if user: # 登录成功,签发token # 通过user得到payload payload = jwt_payload_handler(user) # 通过payload得到token token = jwt_encode_handler(payload) return Response({'code': 10000, 'msg': '登录成功', 'token': token}) else: return ...
response= session.get('http://httpbin.org/cookies/set/sessioncookie/123456789')print(response.request.headers) 二、请求与响应对象 任何时候调用requests.*()方法请求服务器时其实是在做两件主要的事情。 其一,构建一个 Request请求对象, 该对象将被发送到某个服务器请求或查询一些资源。
def get_address(): return "First address" def get_address(): return "Second address" def get_address(): return "Third address" print(get_address()) # Third address ▍56、在外部直接访问私有属性 在定义属性或方法时,在属性名或者方法名前增加两个下划线,定义的就是私有属性或方法。 如果想要在外...
数据可视化：matplotlib、seaborn、bokeh、pyecharts 数据报表：dash 以python操作excel为例，使用xlwings生成...