do questions on a platform similar to leetcode, youdao connectivity search. The function is placed in the class instead of using def _ _ init__ at the beginning of the class, an empty dictionary is declared directly but when you run the problem-...
for doubts about variable objects, please give us some advice. Thank you! problem description: The element of tuple tuple can only hold immutable objects, and the element in it can be list list , because what is actually stored is the address ...
PY built-in dictionary dynamic view is weak and can only be displayed in one way and cannot be updated in both directions. You can t press the key to take a value . is there a library with such a function two dictionaries share some key values with e...
1. Due to the recent introduction to reactjs 2, I want to know whether there is a big difference, such as the difference between the function and the code used by the component. ...
when compiling a project using compass, the following error is reported uses npm (6.4.1), node (8.11.4), ruby (ruby 2.2.6p396 (2016-11-15 revision 56800) [i386-mingw32]). After emptying npm to clear the cache, check whether the installation of ruby,sa...
users send the mobile phone number and red packet link, and the backend gets the small cookies from the database to click the packet, but how to communicate with ele.me server, that is, which address to submit to after getting the second account? is it t...
the available data is as follows (the real situation is about hundreds of thousands of rows): for example, there is another file p.txt with a column as follows: "8240004146789610 8240004356417597 ... 8240004146757344 " I need to extract the nu...
if Party A has a certificate and a public key and a private key, and if it is necessary to encrypt communication with Party B, the public key should be transmitted to Party B. what is puzzling is that if the public key is solved in the process of transmi...