Programmer Think

catalogue Common libraries for data analysis: 1.Numpy: basic knowledge 1.1 Numpy built-in method for creating multidimensional array 1.2 index of multidimensional array 1.2.1 intercepting elements in the list 1.2.2} array index 1.2.3 ， from 2D to 3D 1.3 basic operation of multidimensional array 1.3.1 addition, subtraction, multiplic ...

1 data preprocessing Data preprocessing is roughly divided into three steps: data preparation, data conversion and data output. 1.1 formatted data Scikit learn provides two standard data formatting methods, Fit and Multiple Transform and combined fit and transform. It is recommended to give priority to Fit and Multiple Transform methods. 1. ...

Python notes character string I String introduction 1. Features A pair of quoted strings name1='Jack' name2="Jerry" Three pairs of quoted string name1='''Jack''' name2="""Jerry""" sen1='''I am Jack, nice to meet you!''' sen2="""I am Jack, nice to meet you too!""" Note: string in three quotation marks supports line feed ...

Python basic P1 variable advanced exercise 1. Variable helper (input and print) input function Read the string from standard input (with line break), and the prompt string will be printed to standard output (without line break) before reading the input input standard format input(prompt=None, /) # prompt=None input prompt string The in ...

1. Application Scenario: We used to copy classmates'unwritten homework when we were in school. Sometimes bad luck was discovered by the teacher. Finally, he was handed over to him by the teacher who grabbed the copy of homework N. Copying is about repeating something, and sometimes we have similar problems in our programs. Loops are needed ...

Environment configuration Install Virtualenv Open CMD Install virtualenv pip install virtualenv Switch directory Switch to your work location Create virtual environment virtualenv kv-demo-env KV demo env is the interpreter Setting up the virtual environment interpreter for the compiler Install Kivy (if version replacement is ...

Reading guide In the previous chapters, we introduced how to operate excel and ppt in batches. Today, we talk about the batch operation of word documents application Python docx allows you to create new documents and make changes to existing documents. In fact, it only allows you to make changes to existing documents; But if you start ...

Change The most direct solution to the change problem is the greedy strategy. For example: for coins with face values of 1, 5, 10 and 25, solve the minimum number of coins required to exchange 63 yuan. The idea of greedy strategy is to constantly use the coins with the largest face value to try. No, in this case, 25 coins are used to try the ...

Utility program File and folder operations Create / delete empty directory - mkdir / rmdir. [root ~]# mkdir abc [root ~]# mkdir -p xyz/abc [root ~]# rmdir abc Create / delete file - touch / rm. [root ~]# touch readme.txt [root ~]# touch error.txt [root ~]# rm error.txt rm: remove regular empty file 'error.txt'? y [root ~]# rm -rf xyz T ...

The 10th scheme of propeller RNA structure prediction competition Team name: white crane with bright opposite wings and black bear flying Twin Oars Members: Liu Jianjian, Shi Jingwei, Xiang Jianbiao, Yang Jingli score: 3.722 rmsd_avg:0.269 rmsd_std:0.067 Introduction to competition questions "RNA base unpaired probability" measur ...