Programmer Think

Original link: A puzzle about + = I found a problem in reading today. It's very interesting to share with you. What are the results of the following two Python expressions? t = (1, 2, [3, 4]) t[2] += [5, 6] Give four alternative answers: t becomes (1, 2, [3, 4, 5, 6]).Because tuple does not support assigning values to its elements, it thr ...

preface After differential expression, most of us will see whether our differential gene screening can show the grouping results, and will choose the heat map, mainly the heat map skill clustering, which can also show the size of expression, which is very intuitive. Therefore, in this issue, we will talk about the drawing method of heat map. ...

🔥 🔥 🔥 🔥 🔥 Rush subscription 👉    C + + learn with a smile     👈 Interesting teaching blog 🔥 🔥 🔥 🔥 🔥 Write before: Ah, Hello, friends. I'm lemon leaf C. This chapter will explain the basis of C + + and quote some knowledge. In some places, in order to deepen our understanding, we will give some interestin ...

RxJS is a responsive library. It receives events from the event source. After layer by layer processing of the processing pipeline, it is transmitted to the final receiver. This processing pipeline is composed of operators. Developers only need to select and combine operators to complete various asynchronous logic, which greatly simplifies asyn ...

Primary directory memorandum Variable names begin with letters and number underscoresMATLAB is case sensitiveThe WHO statement displays the names of all variables that have been used, and who is the specific information of the variablesformat short has four digits after the decimal point (default), format long command displays 16 digits, ...

1, Background introduction Log management in the project is one of the basic functions. Different users and scenarios have specific requirements for logs, so different strategies need to be used for log collection and management. If it is a distributed project, the log system design is more complex. Log type: business operation, informatio ...

note Scaffold file structure ├── node_modules ├── public │ ├── favicon.ico: Tab Icon │ └── index.html: Main page ├── src │ ├── assets: Storing static resources │ │ └── logo.png │ │── component: Store components │ │ └── HelloWorld.vue │ │── App.vue: Summarize all components │ │── main.js: Entry file ├── .gitignore: git Con ...

In the last article( In depth jetpack composition - layout principle and custom layout (II) In, we explored the essence and principle of Modifier. This time, let's look at an important feature in the Compose system: inherent characteristic measurement. Inherent characteristic measurement Perhaps many people already know that in order to impro ...

Note: the degree of difficulty is officially recognized by the Blue Bridge Cup (not me (⊙ o ⊙...) 1. Gauss diary (simple) The great mathematician Gauss has a good habit: keep a diary anyway. There is a difference in his diary. He never indicates the date, but uses an integer instead, such as 4210. Later, people know that the integer is the ...

summary The data of the Web application will be stored on the cloud side, and the data will not be cached locally. During data management, you will directly operate cloud side data. The Web SDK will guarantee the communication and communication security between your application and cloud database. This sample application demonstrates how to ...