data is the dataframe, of stock data, including the stock symbol and trading date. then I want to eliminate the data that the trading day is less than 15 days per month. the question now is: I have obtained the dataframe2, of less than 15 days per mon...
The expression in the question is a little unclear: specifically, the reason is a malfunction of the CPU circuit board and needs to be replaced. B= CPU circuit board import re C = re.search (A Magi B) print (C) how to get the index value of CPU c...
the value in the type_pay column does not have a clear number of spaces, so the subsequent mapping processing is not successful. In order to achieve my mapping purpose, what should I do to reduce the type_pay column type value? Ask everyone for advice ...
I need to execute two sets of tasks step by step. The subtasks in each set of tasks are executed in parallel celery, but the second group of tasks needs to wait for the first group of tasks to be completed before continuing to execute . from celery impo...
according to the book "python programming from introduction to practice ", after modifying the models.py, execute the command python manage.py makemigrations learning_logs, to report an error and ask for advice. model.py Code from django.db import...
In python, using is to compare two strings, why does the following result appear: In [1]: x = ab y = ab x is y Out[1]: True In [2]: x = a123b y = a123b x is y Out[2]: True In [3]: x = a,b y ...
this is the url.py in the project blog from django.urls import path from . import views urlpatterns = [ path( , views.index, name="index"), ] this is the url.py in the root directory from django.contrib import admin from django.urls ...
A windows server 2016 machine is opened on Aliyun. After the remote desktop is connected, open cmd to run a flask program (that is, a simple development server, app.run ()), is normal at this time, and there is no problem with external network access. w...
python novice, wrote a program to calculate the file md5, can run through. Then I got confused when I tried to transform it into multithreading. For two-core machines, the calculation time spent on dual-threading is the same as that of not using multi-t...
send a request to oppo with the following headers POST client get_search_completion.pb HTTP 1.1 brand: samsung rom: 2 desktop: desktop_other locale: zh_CN uid: oppo.uid.nearme Referer: SM-G955N appstore 4.3.1 354730010542250 User-Agent: SM-G955N 4.4.2...
when I crawl a page with scrapy, I find that I can only request one page at a time, but the posts on the official website and Baidu say that the concurrency can be controlled through CONCURRENT_REQUESTS , but I tried it or it didn t work? CONCURRENT_...
URL: https: book.douban.com subje. I want to climb to get the names, number of reviews, and ratings of all books searched by Douban keywords, but after I opened the source code interface, the following situation occurred. There is no problem with usin...
engine = create_engine ( "mysql+pymysql: root:111@localhost xxx ", encoding= utf-8 , echo=True) Session_class = sessionmaker (bind=engine) Session = Session_class () modify a record user = Session.query (User). Filter_by (id=1). First () user.n...
inverse.setdefault(val, []).append(key) what function does this sentence achieve? it is easy to understand using one method, but using two methods in a row. I don t understand how the value is passed. the following is the complete code def invert_di...
python2 and python3.5, are already included under ubuntu. I installed 3.6 myself, so I chose 3.6 to configure the interpreter under pycharm, but did not actually execute python3.6. For example, if I execute python on the command line, the default is 3.6....
try to solve the problem without success. If you ask for help, it should be a soft connection problem . 1. The installed requests, should be in the wrong python path (python-v python is 2.7. No, no, no. ) 2.python3.6 brew install python 3. 4. ...
: |--hello.py |--admin |--__init__.py |--admin.py hello.py from flask import Flask from admin.admin import admin app = Flask(__name__) app.register_blueprint(admin, url_prefix= admin ) admin.py from flask import Blueprint admin =...
this statement can draw points by setting my_pointset_data (): my_point, = plt.plot ([], [], bx , alpha=.5) so I want to imitate this statement to realize the drawing of lines between two points: my_line, = plt.plot ([,], [,], color= brown , lines...
beginner python development on the construction of the python environment, as well as the local server python program development understanding and problems, wrong places also look for advice! understanding: when you see the installation of the ...
as shown in the figure, only the tag is returned, but the content is gone. I haven t been learning crawlers for long, and I don t know why I m wrong. ...
how can I use the BrowserRouter of react-router v4 to achieve the same effect in this article? https: dmmylove.cn articles 36 ...
topic description mistakes in doing after-class questions for small turtles sources of topics and their own ideas the source is the fifth post-class question for the little soft-shelled turtle. my idea is to first define a variable, then assign a...
Today, I opened the old project and reported an error. It was found that it was a version problem. First upgrade the ts version, then upgrade the angular version, and finally upgrade the ng-zorro-antd version. All the package.json code after the upgra...
when the frontend sends a request, how can the frontend judge an DNS parsing error or a connection timeout error? ...
SELECT A.VA_REGION_NAME AS AREA_NAME, A.VA_CIG_TRADEMARK AS CIG_NM, B.DE_BS_CXB AS CXB_REL, A.DE_BS_CXB_PRE AS CXB_PRE FROM DCDW.FAC_SCC_ZY_REGION_CXB_PRE A LEFT JOIN DCDW.FAC_SCC_ZY_REGION_CXB B ON B.VA_CIG_TRADEMARK = A.VA_CIG_TRADEMARK AND A.VA_RE...