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In pycharm, how does the chart displayed by matplotlib.pyplot.show () pop up when output to sciview,?
< H2 > 1. Question: < H2 >
like the title, how does the chart displayed by matplotlib.pyplot.show () in pycharm pop up to sciview,?
< H2 > 2. Code: < H2 >
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib impo...
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The thread pool of futuers in python3 is very efficient, but sometimes I wonder if it can be realized if it is a little slower, such as an interval of 0.5 between tasks.
The question is written on the title, is there any way to be spaced by BAN, when it is applied too fast in crawlers? Or is it that there is no interval in this kind of concurrency? ...
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Python installation error, update machine required
the newly installed win7 system, Ann python is, the installation package setup comes out of this, which I have encountered before. I forgot how to solve it. ...
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What is the job_defaults setting in the PYTHON APScheduler library? I don't understand it. I ask the boss to solve the problem.
the settings of the webmaster document are as follows
from pytz import utc
from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.jobstores.mongodb import MongoDBJobStore
from apscheduler.jobstores.sqlalchemy import SQLAlche...
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Python uses pymongo to connect to the local database prompt to actively reject?
the problem is like a question. I ll describe the details in detail. asked the same question on Zhihu
when I was self-taught python crawler, I came into contact with MongoDB, to install according to the URL given by rookie tutorial . Visual obser...
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Ask Python3 for libraries with search messages, such as imaplib and imapclient. Do you know if there are any?
1. (requirements) can be deleted by searching for matching messages based on time or sender.
2. (background) I have used the two libraries imaplib and imapclient, one official and one third party, and Poplib does not have the search function. Although...
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How does the Python database orm framework SQLAlchemy exclude specified fields and not map / serialize specified fields when mapping fields?
as shown in the figure below, does SQLAlchemy have a simple way to directly declare that the specified field is not mapped serialized?
for example, does java s Hibernate framework have such a function?
(although there are other "indirect " solut...
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Pip installation error Command "python setup.py egg_info"
python3.6 pip 9.0.3 install shapely 1.6.4 error as shown in figure ...
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Python3 encountered an error while accessing the asp page using requests.
the official WeChat of the school has an one-click function to check grades, and I have always wanted to be able to do it. Now I am learning python, and I am going to use it to practice, but I made a 500th error during the interview.
here is the code:...
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What is the difference between the two built-in functions exec and eval in python3?
there are two built-in functions that have very similar functional descriptions:
>>> help(exec)
Help on built-in function exec in module builtins:
exec(source, globals=None, locals=None, )
Execute the given source in the context of globa...
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Python setup.py register Server response (410):
python setup.py register
enter the account password and then 410:
Server response (410): Project pre-registration is no longer required or support
ed, so continue directly to uploading files.
...
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Pymongo queries the first 1w of data for a specific condition, and the count result is the number of records of the entire collection. What's wrong with me?
the code is as follows: recode1 = table_out.find ({}). Sort ([( "_ id ", 1)]) .limit (10000) print ( total: , recode1.count ()) directly understand that the number of count () given by print should be 10,000, but what is currently output is the tota...
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Invalid Python requests agent
use the requests proxy module and do not change the ip address after success
< hr >
Code:
import requests
from bs4 import BeautifulSoup
url=r http: ip.chinaz.com
proxy={ http : http: 177.130.55.164:20183 ,
https : https: 177.1...
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Python time string processing problem converts "3 hours and 10 minutes" into "190minutes" solving method
python converts "3 hours and 10 minutes " to "190 minutes " solution ...
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How to implement top n problem with JavaScript? For example, most_common () of python
We know that the collections of the python built-in module has a lot of useful operations. for example:
from collections import Counter
-sharp
-sharp top n
user_counter = Counter("abbafafpskaag")
print(user_counter.most_common(3)) -sharp[( ...
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Could you tell me how to call the program regularly in the Windows py3 environment?
check to see that celery and airflow, do not support Windows in the actual experiment. is there another way to implement this? can only reinstall a linux. ...
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Using the slicing operation, a trim () function is implemented to remove the spaces at the beginning and end of the string.
1. Recently, I have studied python, again to see the slicing part of Liao Xuefeng s tutorial. I would like to ask how this code realizes that the spaces on both sides are not displayed in the output by slicing .
def trim(s):
if s[:1] != and ...
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How to draw classified pictures in perceptron with matplotlib
question: recently I was learning the perceptron model and wanted to draw the following picture, but found that the + - sign in the following picture could not be drawn.
drawing code from elsewhere, where Perceptron is a class implemented i...
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On the question of a dictionary operation in python, separated by condition
the data obtained from the database is such a dictionary
{
q_1 : 9, q_2 : 12, q3 : 22, q4 : 2, q5 : 6,
w_1 : 9, w_2 : 12, w_3 : 22, w_4 : 2, w_5 : 6,
e_1 : 9, e_2 : 12, e_3 : 22, e_4 : 2, e_5 : 6...
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The problem of variable parameters and position parameters of Python 3
def f1(a, b, c=0, *args, **kw):
print( a = , a, b = , b, c = , c, args = , args, kw = , kw)
args = (1, 2, 3, 4)
kw = { d : 99, x : -sharp }
f1(*args, **kw)
the result is a = 1 b = 2 c = 3 args = (4,) kw = { dink: 99...
