Test a login and logout. I already instantiated a webdriver, when I logged in. I want to reference this driver. in the logout case. How can I refer to this driver? Why should I refer to the driver, in the login case instead of instantiating another dr...
A model has data A1 B model has data b1 b1.key1 is a foreign key, associated with the primary key of a1.id is there a problem for me to delete A1 data directly now? db.session.delete (A1) db.session.commit () ...
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 ...
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...
for example, I now have a variable: num=5 then I need to fill in the value of this num to the position of the underscore in "x0_ ". How can I do that? try 1: x codeshelper id=0 0% s% (5) so the x is " x05 " instead of "x05 " ...
use react + Flask to build a small website, generally read "in-depth understanding of Flask ". after using react, the backend template jinja and routing no longer need to be learned? ...
a = { name : zzzz } a.name = yuioi error a [ name ] = asdasd Why ". " Operation will report an error ...
I just started to learn python2.7, compared to the examples in the book, but when I write here, I always report grammatical errors. looked at it, and searched the Internet, but didn t find out where the mistake was. this is the source code: class U...
recently, it often appears when using sqlalchemy+python+gunicorn to develop a small project. Sqlalchemy reads the data and returns None, but it is possible to view the data in the database. As a novice, I suspect that there is something wrong with my wr...
I use pyinstaller to package the environment is python2.7.11,pyinstaller 3.3.1. there are only these two py files manage_utils.py mainform.py.,pyinstaller -F mainform.py, , how did this happen? And the path of program execution seems to have chang...
what kind of data is suitable for store? Both vux and redux, see that many people put all the data in store for global management, such as a list. In fact, the data in this list is not communicated with other components, but is only used in this list. An...
it is said to be a local variable count on the Internet. ...
generate the corresponding loop based on the given number. If 2 is given, a double cycle is generated, and 3 is a triple cycle if 3 is given, then for (let i = 0; i < arr.length; iPP) { for (let j = 0; j < arr.length; jPP) { ...
H5 developed by react, after the npm run build is packaged, put the dist file in the native Android after packaging Android, it is found that the route on the H5 page cannot be loaded by clicking on the link ...
The stacked histogram of ecahrts. You want to sort from largest to smallest in the same horizontal column. like this, each horizontal row is shown sorted from big to small. does the official have such an interface? Or how can it be achieved with j...