def get_length_of_missing_array (array_of_arrays): if len(array_of_arrays)==0: return 0 else: lenlist = [len(i) for i in array_of_arrays ] print(lenlist) rangelist=[t for t in range(min(lenlist),max(lenlist)+1)] print(rangelist) ...
suddenly there is an idea that if the field changes are complicated when making a query, you can t write the query statement, just like A.query.filter (name== ds ) is written dead. If I need to dynamically switch query fields, especially when there ...
from MyQR import myqr error Users jiao Desktop qr_generate bin python3.6 Users jiao Desktop qr_generate main.py Traceback (most recent call last): File " Users jiao Desktop qr_generate main.py ", line 4, in < module > from MyQR import myqr Fi...
try to climb the net http: 58.22.3.131:9003 web html index.html?module=zhbb caught this package in devtool, but it s strange that sending post requests using requests used to be 500 and it was a 500 error to right-click on the package to open it o...
this big list data adds 100w pieces of data, take 1000 pieces of data from this big list at a time, and delete it from the list at present, my solution is: a = range(1000000) b=[] for i in range(1000): b.append(a.pop()) feels that this method is ...
import MySQLdb conn = MySQLdb.connect( 127.0.0.1 , root , 123456 , test ,charset= utf8 ) -sharp sql = "insert into userinfo(usernamne,pwd) values(%s,%s)" li = [("name1","338"),("name2","313"...
for example, I have a string whose content is: Python has a rich and powerful library. It is often nicknamed glue language and can easily connect modules made in other languages (especially C CPP). A common application scenario is to use Python to qui...
for example, how to view the source code of python built-in functions give an example: -sharp xrang for i in xrange(10): print i -sharp -sharp pass class xrange(object): """ xrange(stop) -> xrange object xrange(star...
want to achieve selenium login, but how can not navigate to the account password input box, tried a lot of methods did not work. even this iframe is dynamic ...
class Ux(QMainWindow, window.Ui_MainWindow): @pyqtSlot() def do_stop_search(self): pass @pyqtSlot(dict) def do_append_result(self, item): pass def on_btn_search_clicked(self): self.search = SearchThread(s...
this module is used to authenticate users from django.contrib.auth import authenticate A few days ago, you can use user = authenticate (username=username, password=password) to return a user, but today you try to return None . the following proble...
want to put a picture on the web page, which cannot be realized according to the online writing method. Django 2.0 setting is like this . STATIC_URL = static STATIC_ROOT = os.path.join(BASE_DIR, static ) main_html app staticurls main.html ...
The problem originates from the chapter in map reduce in Liao Xuefeng s python tutorial. Use functions and map, to capitalize the first letter of the string in the list , and then return the list . Link the initial code is, for in iteration, and...
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...
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...
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...
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 ...
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. ...
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[( ...
python converts "3 hours and 10 minutes " to "190 minutes " solution ...